XML序列化 判断是否是手机 字符操作普通帮助类 验证数据帮助类 IO帮助类 c# Lambda操作类封装 C# -- 使用反射（Reflect）获取dll文件中的类型并调用方法 C# -- 文件的压缩与解压（GZipStream）

XML序列化

#region  序列化

        /// <summary>
        /// XML序列化
        /// </summary>
        /// <param name="obj">序列对象</param>
        /// <param name="filePath">XML文件路径</param>
        /// <returns>是否成功</returns>
        public static bool SerializeToXml(object obj, string filePath)
        {
            bool result = false;

            FileStream fs = null;
            try
            {
                fs = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.ReadWrite);
                XmlSerializer serializer = new XmlSerializer(obj.GetType());
                serializer.Serialize(fs, obj);
                result = true;
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (fs != null)
                    fs.Close();
            }
            return result;

        }

        /// <summary>
        /// XML反序列化
        /// </summary>
        /// <param name="type">目标类型(Type类型)</param>
        /// <param name="filePath">XML文件路径</param>
        /// <returns>序列对象</returns>
        public static object DeserializeFromXML(Type type, string filePath)
        {
            FileStream fs = null;
            try
            {
                fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
                XmlSerializer serializer = new XmlSerializer(type);
                return serializer.Deserialize(fs);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (fs != null)
                    fs.Close();
            }
        }

        #endregion

判断是否是手机

public static bool CheckAgent()
{
bool flag = false;

string agent = HttpContext.Current.Request.UserAgent;
string[] keywords = { "Android", "iPhone", "iPod", "iPad", "Windows Phone", "MQQBrowser" };

//排除 Windows 桌面系统
if (!agent.Contains("Windows NT") || (agent.Contains("Windows NT") && agent.Contains("compatible; MSIE 9.0;")))
{
//排除 苹果桌面系统
if (!agent.Contains("Windows NT") && !agent.Contains("Macintosh"))
{
foreach (string item in keywords)
{
if (agent.Contains(item))
{
flag = true;
break;
}
}
}
}

return flag;
}

字符操作普通帮助类

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/// <summary>    /// 普通帮助类    /// </summary>    public class CommonHelper    {        //星期数组        private static string[] _weekdays = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };        //空格、回车、换行符、制表符正则表达式        private static Regex _tbbrRegex = new Regex(@"\s*|\t|\r|\n", RegexOptions.IgnoreCase);        #region 时间操作        /// <summary>        /// 获得当前时间的""yyyy-MM-dd HH:mm:ss:fffffff""格式字符串        /// </summary>        public static string GetDateTimeMS()        {            return DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fffffff");        }        /// <summary>        /// 获得当前时间的""yyyy年MM月dd日 HH:mm:ss""格式字符串        /// </summary>        public static string GetDateTimeU()        {            return string.Format("{0:U}", DateTime.Now);        }        /// <summary>        /// 获得当前时间的""yyyy-MM-dd HH:mm:ss""格式字符串        /// </summary>        public static string GetDateTime()        {            return DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");        }        /// <summary>        /// 获得当前日期        /// </summary>        public static string GetDate()        {            return DateTime.Now.ToString("yyyy-MM-dd");        }        /// <summary>        /// 获得中文当前日期        /// </summary>        public static string GetChineseDate()        {            return DateTime.Now.ToString("yyyy月MM日dd");        }        /// <summary>        /// 获得当前时间(不含日期部分)        /// </summary>        public static string GetTime()        {            return DateTime.Now.ToString("HH:mm:ss");        }        /// <summary>        /// 获得当前小时        /// </summary>        public static string GetHour()        {            return DateTime.Now.Hour.ToString("00");        }        /// <summary>        /// 获得当前天        /// </summary>        public static string GetDay()        {            return DateTime.Now.Day.ToString("00");        }        /// <summary>        /// 获得当前月        /// </summary>        public static string GetMonth()        {            return DateTime.Now.Month.ToString("00");        }        /// <summary>        /// 获得当前年        /// </summary>        public static string GetYear()        {            return DateTime.Now.Year.ToString();        }        /// <summary>        /// 获得当前星期(数字)        /// </summary>        public static string GetDayOfWeek()        {            return ((int)DateTime.Now.DayOfWeek).ToString();        }        /// <summary>        /// 获得当前星期(汉字)        /// </summary>        public static string GetWeek()        {            return _weekdays[(int)DateTime.Now.DayOfWeek];        }        #endregion        #region 数组操作        /// <summary>        /// 获得字符串在字符串数组中的位置        /// </summary>        public static int GetIndexInArray(string s, string[] array, bool ignoreCase)        {            if (string.IsNullOrEmpty(s) || array == null || array.Length == 0)                return -1;            int index = 0;            string temp = null;            if (ignoreCase)                s = s.ToLower();            foreach (string item in array)            {                if (ignoreCase)                    temp = item.ToLower();                else                    temp = item;                if (s == temp)                    return index;                else                    index++;            }            return -1;        }        /// <summary>        /// 获得字符串在字符串数组中的位置        /// </summary>        public static int GetIndexInArray(string s, string[] array)        {            return GetIndexInArray(s, array, false);        }        /// <summary>        /// 判断字符串是否在字符串数组中        /// </summary>        public static bool IsInArray(string s, string[] array, bool ignoreCase)        {            return GetIndexInArray(s, array, ignoreCase) > -1;        }        /// <summary>        /// 判断字符串是否在字符串数组中        /// </summary>        public static bool IsInArray(string s, string[] array)        {            return IsInArray(s, array, false);        }        /// <summary>        /// 判断字符串是否在字符串中        /// </summary>        public static bool IsInArray(string s, string array, string splitStr, bool ignoreCase)        {            return IsInArray(s, StringHelper.SplitString(array, splitStr), ignoreCase);        }        /// <summary>        /// 判断字符串是否在字符串中        /// </summary>        public static bool IsInArray(string s, string array, string splitStr)        {            return IsInArray(s, StringHelper.SplitString(array, splitStr), false);        }        /// <summary>        /// 判断字符串是否在字符串中        /// </summary>        public static bool IsInArray(string s, string array)        {            return IsInArray(s, StringHelper.SplitString(array, ","), false);        }        /// <summary>        /// 将对象数组拼接成字符串        /// </summary>        public static string ObjectArrayToString(object[] array, string splitStr)        {            if (array == null || array.Length == 0)                return "";            StringBuilder result = new StringBuilder();            for (int i = 0; i < array.Length; i++)                result.AppendFormat("{0}{1}", array[i], splitStr);            return result.Remove(result.Length - splitStr.Length, splitStr.Length).ToString();        }        /// <summary>        /// 将对象数组拼接成字符串        /// </summary>        public static string ObjectArrayToString(object[] array)        {            return ObjectArrayToString(array, ",");        }        /// <summary>        /// 将字符串数组拼接成字符串        /// </summary>        public static string StringArrayToString(string[] array, string splitStr)        {            return ObjectArrayToString(array, splitStr);        }        /// <summary>        /// 将字符串数组拼接成字符串        /// </summary>        public static string StringArrayToString(string[] array)        {            return StringArrayToString(array, ",");        }        /// <summary>        /// 将整数数组拼接成字符串        /// </summary>        public static string IntArrayToString(int[] array, string splitStr)        {            if (array == null || array.Length == 0)                return "";            StringBuilder result = new StringBuilder();            for (int i = 0; i < array.Length; i++)                result.AppendFormat("{0}{1}", array[i], splitStr);            return result.Remove(result.Length - splitStr.Length, splitStr.Length).ToString();        }        /// <summary>        /// 将整数数组拼接成字符串        /// </summary>        public static string IntArrayToString(int[] array)        {            return IntArrayToString(array, ",");        }        /// <summary>        /// 移除数组中的指定项        /// </summary>        /// <param name="array">源数组</param>        /// <param name="removeItem">要移除的项</param>        /// <param name="removeBackspace">是否移除空格</param>        /// <param name="ignoreCase">是否忽略大小写</param>        /// <returns></returns>        public static string[] RemoveArrayItem(string[] array, string removeItem, bool removeBackspace, bool ignoreCase)        {            if (array != null && array.Length > 0)            {                StringBuilder arrayStr = new StringBuilder();                if (ignoreCase)                    removeItem = removeItem.ToLower();                string temp = "";                foreach (string item in array)                {                    if (ignoreCase)                        temp = item.ToLower();                    else                        temp = item;                    if (temp != removeItem)                        arrayStr.AppendFormat("{0}_", removeBackspace ? item.Trim() : item);                }                return StringHelper.SplitString(arrayStr.Remove(arrayStr.Length - 1, 1).ToString(), "_");            }            return array;        }        /// <summary>        /// 移除数组中的指定项        /// </summary>        /// <param name="array">源数组</param>        /// <returns></returns>        public static string[] RemoveArrayItem(string[] array)        {            return RemoveArrayItem(array, "", true, false);        }        /// <summary>        /// 移除字符串中的指定项        /// </summary>        /// <param name="s">源字符串</param>        /// <param name="splitStr">分割字符串</param>        /// <returns></returns>        public static string[] RemoveStringItem(string s, string splitStr)        {            return RemoveArrayItem(StringHelper.SplitString(s, splitStr), "", true, false);        }        /// <summary>        /// 移除字符串中的指定项        /// </summary>        /// <param name="s">源字符串</param>        /// <returns></returns>        public static string[] RemoveStringItem(string s)        {            return RemoveArrayItem(StringHelper.SplitString(s), "", true, false);        }        /// <summary>        /// 移除数组中的重复项        /// </summary>        /// <returns></returns>        public static int[] RemoveRepeaterItem(int[] array)        {            if (array == null || array.Length < 2)                return array;            Array.Sort(array);            int length = 1;            for (int i = 1; i < array.Length; i++)            {                if (array[i] != array[i - 1])                    length++;            }            int[] uniqueArray = new int[length];            uniqueArray[0] = array[0];            int j = 1;            for (int i = 1; i < array.Length; i++)                if (array[i] != array[i - 1])                    uniqueArray[j++] = array[i];            return uniqueArray;        }        /// <summary>        /// 移除数组中的重复项        /// </summary>        /// <returns></returns>        public static string[] RemoveRepeaterItem(string[] array)        {            if (array == null || array.Length < 2)                return array;            Array.Sort(array);            int length = 1;            for (int i = 1; i < array.Length; i++)            {                if (array[i] != array[i - 1])                    length++;            }            string[] uniqueArray = new string[length];            uniqueArray[0] = array[0];            int j = 1;            for (int i = 1; i < array.Length; i++)                if (array[i] != array[i - 1])                    uniqueArray[j++] = array[i];            return uniqueArray;        }        /// <summary>        /// 去除字符串中的重复元素        /// </summary>        /// <returns></returns>        public static string GetUniqueString(string s)        {            return GetUniqueString(s, ",");        }        /// <summary>        /// 去除字符串中的重复元素        /// </summary>        /// <returns></returns>        public static string GetUniqueString(string s, string splitStr)        {            return ObjectArrayToString(RemoveRepeaterItem(StringHelper.SplitString(s, splitStr)), splitStr);        }        #endregion        /// <summary>        /// 去除字符串首尾处的空格、回车、换行符、制表符        /// </summary>        public static string TBBRTrim(string str)        {            if (!string.IsNullOrEmpty(str))                return str.Trim().Trim('\r').Trim('\n').Trim('\t');            return string.Empty;        }        /// <summary>        /// 去除字符串中的空格、回车、换行符、制表符        /// </summary>        public static string ClearTBBR(string str)        {            if (!string.IsNullOrEmpty(str))                return _tbbrRegex.Replace(str, "");            return string.Empty;        }        /// <summary>        /// 删除字符串中的空行        /// </summary>        /// <returns></returns>        public static string DeleteNullOrSpaceRow(string s)        {            if (string.IsNullOrEmpty(s))                return "";            string[] tempArray = StringHelper.SplitString(s, "\r\n");            StringBuilder result = new StringBuilder();            foreach (string item in tempArray)            {                if (!string.IsNullOrWhiteSpace(item))                    result.AppendFormat("{0}\r\n", item);            }            if (result.Length > 0)                result.Remove(result.Length - 2, 2);            return result.ToString();        }        /// <summary>        /// 获得指定数量的html空格        /// </summary>        /// <returns></returns>        public static string GetHtmlBS(int count)        {            if (count == 1)                return "    ";            else if (count == 2)                return "        ";            else if (count == 3)                return "            ";            else            {                StringBuilder result = new StringBuilder();                for (int i = 0; i < count; i++)                    result.Append("    ");                return result.ToString();            }        }        /// <summary>        /// 获得指定数量的htmlSpan元素        /// </summary>        /// <returns></returns>        public static string GetHtmlSpan(int count)        {            if (count <= 0)                return "";            if (count == 1)                return "<span></span>";            else if (count == 2)                return "<span></span><span></span>";            else if (count == 3)                return "<span></span><span></span><span></span>";            else            {                StringBuilder result = new StringBuilder();                for (int i = 0; i < count; i++)                    result.Append("<span></span>");                return result.ToString();            }        }        /// <summary>        ///获得邮箱提供者        /// </summary>        /// <param name="email">邮箱</param>        /// <returns></returns>        public static string GetEmailProvider(string email)        {            int index = email.LastIndexOf('@');            if (index > 0)                return email.Substring(index + 1);            return string.Empty;        }        /// <summary>        /// 转义正则表达式        /// </summary>        public static string EscapeRegex(string s)        {            string[] oList = { "\\", ".", "+", "*", "?", "{", "}", "[", "^", "]", "$", "(", ")", "=", "!", "<", ">", "|", ":" };            string[] eList = { "\\\\", "\\.", "\\+", "\\*", "\\?", "\\{", "\\}", "\\[", "\\^", "\\]", "\\$", "\\(", "\\)", "\\=", "\\!", "\\<", "\\>", "\\|", "\\:" };            for (int i = 0; i < oList.Length; i++)                s = s.Replace(oList[i], eList[i]);            return s;        }        /// <summary>        /// 将ip地址转换成long类型        /// </summary>        /// <param name="ip">ip</param>        /// <returns></returns>        public static long ConvertIPToLong(string ip)        {            string[] ips = ip.Split('.');            long number = 16777216L * long.Parse(ips[0]) + 65536L * long.Parse(ips[1]) + 256 * long.Parse(ips[2]) + long.Parse(ips[3]);            return number;        }        /// <summary>        /// 隐藏邮箱        /// </summary>        public static string HideEmail(string email)        {            int index = email.LastIndexOf('@');            if (index == 1)                return "*" + email.Substring(index);            if (index == 2)                return email[0] + "*" + email.Substring(index);            StringBuilder sb = new StringBuilder();            sb.Append(email.Substring(0, 2));            int count = index - 2;            while (count > 0)            {                sb.Append("*");                count--;            }            sb.Append(email.Substring(index));            return sb.ToString();        }        /// <summary>        /// 隐藏手机        /// </summary>        public static string HideMobile(string mobile)        {            if (mobile != null && mobile.Length > 10)                return mobile.Substring(0, 3) + "*****" + mobile.Substring(8);            return string.Empty;        }        /// <summary>        /// 数据转换为列表        /// </summary>        /// <param name="array">数组</param>        /// <returns></returns>        public static List<T> ArrayToList<T>(T[] array)        {            List<T> list = new List<T>(array.Length);            foreach (T item in array)                list.Add(item);            return list;        }        /// <summary>        /// DataTable转化为List        /// </summary>        /// <param name="dt">DataTable</param>        /// <returns></returns>        public static List<Dictionary<string, object>> DataTableToList(DataTable dt)        {            int columnCount = dt.Columns.Count;            List<Dictionary<string, object>> list = new List<Dictionary<string, object>>(dt.Rows.Count);            foreach (DataRow dr in dt.Rows)            {                Dictionary<string, object> item = new Dictionary<string, object>(columnCount);                for (int i = 0; i < columnCount; i++)                {                    item.Add(dt.Columns[i].ColumnName, dr[i]);                }                list.Add(item);            }            return list;        }    }

　　

验证数据帮助类

using System;
using System.Text.RegularExpressions;

namespace ZMM.Core
{
    /// <summary>
    /// 验证帮助类
    /// </summary>
    public class ValidateHelper
    {
        //邮件正则表达式
        private static Regex _emailregex = new Regex(@"^[a-z0-9]([a-z0-9]*[-_]?[a-z0-9]+)*@([a-z0-9]*[-_]?[a-z0-9]+)+[\.][a-z]{2,3}([\.][a-z]{2})?$", RegexOptions.IgnoreCase);
        //手机号正则表达式
        private static Regex _mobileregex = new Regex("^(13|15|17|18)[0-9]{9}$");
        //固话号正则表达式
        private static Regex _phoneregex = new Regex(@"^(\d{3,4}-?)?\d{7,8}$");
        //IP正则表达式
        private static Regex _ipregex = new Regex(@"^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$");
        //日期正则表达式
        private static Regex _dateregex = new Regex(@"(\d{4})-(\d{1,2})-(\d{1,2})");
        //数值(包括整数和小数)正则表达式
        private static Regex _numericregex = new Regex(@"^[-]?[0-9]+(\.[0-9]+)?$");
        //邮政编码正则表达式
        private static Regex _zipcoderegex = new Regex(@"^\d{6}$");

        /// <summary>
        /// 是否为邮箱名
        /// </summary>
        public static bool IsEmail(string s)
        {
            if (string.IsNullOrEmpty(s))
                return true;
            return _emailregex.IsMatch(s);
        }

        /// <summary>
        /// 是否为手机号
        /// </summary>
        public static bool IsMobile(string s)
        {
            if (string.IsNullOrEmpty(s))
                return true;
            return _mobileregex.IsMatch(s);
        }

        /// <summary>
        /// 是否为固话号
        /// </summary>
        public static bool IsPhone(string s)
        {
            if (string.IsNullOrEmpty(s))
                return true;
            return _phoneregex.IsMatch(s);
        }

        /// <summary>
        /// 是否为IP
        /// </summary>
        public static bool IsIP(string s)
        {
            return _ipregex.IsMatch(s);
        }

        /// <summary>
        /// 是否是身份证号
        /// </summary>
        public static bool IsIdCard(string id)
        {
            if (string.IsNullOrEmpty(id))
                return true;
            if (id.Length == 18)
                return CheckIDCard18(id);
            else if (id.Length == 15)
                return CheckIDCard15(id);
            else
                return false;
        }

        /// <summary>
        /// 是否为18位身份证号
        /// </summary>
        private static bool CheckIDCard18(string Id)
        {
            long n = 0;
            if (long.TryParse(Id.Remove(17), out n) == false || n < Math.Pow(10, 16) || long.TryParse(Id.Replace('x', '0').Replace('X', '0'), out n) == false)
                return false;//数字验证

            string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
            if (address.IndexOf(Id.Remove(2)) == -1)
                return false;//省份验证

            string birth = Id.Substring(6, 8).Insert(6, "-").Insert(4, "-");
            DateTime time = new DateTime();
            if (DateTime.TryParse(birth, out time) == false)
                return false;//生日验证

            string[] arrVarifyCode = ("1,0,x,9,8,7,6,5,4,3,2").Split(',');
            string[] Wi = ("7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2").Split(',');
            char[] Ai = Id.Remove(17).ToCharArray();
            int sum = 0;
            for (int i = 0; i < 17; i++)
                sum += int.Parse(Wi[i]) * int.Parse(Ai[i].ToString());

            int y = -1;
            Math.DivRem(sum, 11, out y);
            if (arrVarifyCode[y] != Id.Substring(17, 1).ToLower())
                return false;//校验码验证

            return true;//符合GB11643-1999标准
        }

        /// <summary>
        /// 是否为15位身份证号
        /// </summary>
        private static bool CheckIDCard15(string Id)
        {
            long n = 0;
            if (long.TryParse(Id, out n) == false || n < Math.Pow(10, 14))
                return false;//数字验证

            string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
            if (address.IndexOf(Id.Remove(2)) == -1)
                return false;//省份验证

            string birth = Id.Substring(6, 6).Insert(4, "-").Insert(2, "-");
            DateTime time = new DateTime();
            if (DateTime.TryParse(birth, out time) == false)
                return false;//生日验证

            return true;//符合15位身份证标准
        }

        /// <summary>
        /// 是否为日期
        /// </summary>
        public static bool IsDate(string s)
        {
            return _dateregex.IsMatch(s);
        }

        /// <summary>
        /// 是否是数值(包括整数和小数)
        /// </summary>
        public static bool IsNumeric(string numericStr)
        {
            return _numericregex.IsMatch(numericStr);
        }

        /// <summary>
        /// 是否为邮政编码
        /// </summary>
        public static bool IsZipCode(string s)
        {
            if (string.IsNullOrEmpty(s))
                return true;
            return _zipcoderegex.IsMatch(s);
        }

        /// <summary>
        /// 是否是图片文件名
        /// </summary>
        /// <returns> </returns>
        public static bool IsImgFileName(string fileName)
        {
            if (fileName.IndexOf(".") == -1)
                return false;

            string tempFileName = fileName.Trim().ToLower();
            string extension = tempFileName.Substring(tempFileName.LastIndexOf("."));
            return extension == ".png" || extension == ".bmp" || extension == ".jpg" || extension == ".jpeg" || extension == ".gif";
        }
        /// <summary>
        /// 是否是文件名word
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public static bool IsFile(string fileName)
        {
            if (fileName.IndexOf(".") == -1)
                return false;

            string tempFileName = fileName.Trim().ToLower();
            string extension = tempFileName.Substring(tempFileName.LastIndexOf("."));
            return extension == ".doc" || extension == ".docx" || extension == ".xls" || extension == ".xlsx" || extension == ".txt";
        }

        /// <summary>
        /// 判断一个ip是否在另一个ip内
        /// </summary>
        /// <param name="sourceIP">检测ip</param>
        /// <param name="targetIP">匹配ip</param>
        /// <returns></returns>
        public static bool InIP(string sourceIP, string targetIP)
        {
            if (string.IsNullOrEmpty(sourceIP) || string.IsNullOrEmpty(targetIP))
                return false;

            string[] sourceIPBlockList = StringHelper.SplitString(sourceIP, @".");
            string[] targetIPBlockList = StringHelper.SplitString(targetIP, @".");

            int sourceIPBlockListLength = sourceIPBlockList.Length;

            for (int i = 0; i < sourceIPBlockListLength; i++)
            {
                if (targetIPBlockList[i] == "*")
                    return true;

                if (sourceIPBlockList[i] != targetIPBlockList[i])
                {
                    return false;
                }
                else
                {
                    if (i == 3)
                        return true;
                }
            }
            return false;
        }

        /// <summary>
        /// 判断一个ip是否在另一个ip内
        /// </summary>
        /// <param name="sourceIP">检测ip</param>
        /// <param name="targetIPList">匹配ip列表</param>
        /// <returns></returns>
        public static bool InIPList(string sourceIP, string[] targetIPList)
        {
            if (targetIPList != null && targetIPList.Length > 0)
            {
                foreach (string targetIP in targetIPList)
                {
                    if (InIP(sourceIP, targetIP))
                        return true;
                }
            }
            return false;
        }

        /// <summary>
        /// 判断一个ip是否在另一个ip内
        /// </summary>
        /// <param name="sourceIP">检测ip</param>
        /// <param name="targetIPStr">匹配ip</param>
        /// <returns></returns>
        public static bool InIPList(string sourceIP, string targetIPStr)
        {
            string[] targetIPList = StringHelper.SplitString(targetIPStr, "\n");
            return InIPList(sourceIP, targetIPList);
        }

        /// <summary>
        /// 判断当前时间是否在指定的时间段内
        /// </summary>
        /// <param name="periodList">指定时间段</param>
        /// <param name="liePeriod">所处时间段</param>
        /// <returns></returns>
        public static bool BetweenPeriod(string[] periodList, out string liePeriod)
        {
            if (periodList != null && periodList.Length > 0)
            {
                DateTime startTime;
                DateTime endTime;
                DateTime nowTime = DateTime.Now;
                DateTime nowDate = nowTime.Date;

                foreach (string period in periodList)
                {
                    int index = period.IndexOf("-");
                    startTime = TypeHelper.StringToDateTime(period.Substring(0, index));
                    endTime = TypeHelper.StringToDateTime(period.Substring(index + 1));

                    if (startTime < endTime)
                    {
                        if (nowTime > startTime && nowTime < endTime)
                        {
                            liePeriod = period;
                            return true;
                        }
                    }
                    else
                    {
                        if ((nowTime > startTime && nowTime < nowDate.AddDays(1)) || (nowTime < endTime))
                        {
                            liePeriod = period;
                            return true;
                        }
                    }
                }
            }
            liePeriod = string.Empty;
            return false;
        }

        /// <summary>
        /// 判断当前时间是否在指定的时间段内
        /// </summary>
        /// <param name="periodStr">指定时间段</param>
        /// <param name="liePeriod">所处时间段</param>
        /// <returns></returns>
        public static bool BetweenPeriod(string periodStr, out string liePeriod)
        {
            string[] periodList = StringHelper.SplitString(periodStr, "\n");
            return BetweenPeriod(periodList, out liePeriod);
        }

        /// <summary>
        /// 判断当前时间是否在指定的时间段内
        /// </summary>
        /// <param name="periodList">指定时间段</param>
        /// <returns></returns>
        public static bool BetweenPeriod(string periodList)
        {
            string liePeriod = string.Empty;
            return BetweenPeriod(periodList, out liePeriod);
        }

        /// <summary>
        /// 是否是数值(包括整数和小数)
        /// </summary>
        public static bool IsNumericArray(string[] numericStrList)
        {
            if (numericStrList != null && numericStrList.Length > 0)
            {
                foreach (string numberStr in numericStrList)
                {
                    if (!IsNumeric(numberStr))
                        return false;
                }
                return true;
            }
            return false;
        }

        /// <summary>
        /// 是否是数值(包括整数和小数)
        /// </summary>
        public static bool IsNumericRule(string numericRuleStr, string splitChar)
        {
            return IsNumericArray(StringHelper.SplitString(numericRuleStr, splitChar));
        }

        /// <summary>
        /// 是否是数值(包括整数和小数)
        /// </summary>
        public static bool IsNumericRule(string numericRuleStr)
        {
            return IsNumericRule(numericRuleStr, ",");
        }
    }
}

IO帮助类

using System;
using System.IO;
using System.Web;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Xml.Serialization;

namespace ZMM.Core
{
    /// <summary>
    /// IO帮助类
    /// </summary>
    public class IOHelper
    {
        //是否已经加载了JPEG编码解码器
        private static bool _isloadjpegcodec = false;
        //当前系统安装的JPEG编码解码器
        private static ImageCodecInfo _jpegcodec = null;

        /// <summary>
        /// 获得文件物理路径
        /// </summary>
        /// <returns></returns>
        public static string GetMapPath(string path)
        {
            if (HttpContext.Current != null)
            {
                return HttpContext.Current.Server.MapPath(path);
            }
            else
            {
                return System.Web.Hosting.HostingEnvironment.MapPath(path);
            }
        }

        #region  序列化

        /// <summary>
        /// XML序列化
        /// </summary>
        /// <param name="obj">序列对象</param>
        /// <param name="filePath">XML文件路径</param>
        /// <returns>是否成功</returns>
        public static bool SerializeToXml(object obj, string filePath)
        {
            bool result = false;

            FileStream fs = null;
            try
            {
                fs = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.ReadWrite);
                XmlSerializer serializer = new XmlSerializer(obj.GetType());
                serializer.Serialize(fs, obj);
                result = true;
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (fs != null)
                    fs.Close();
            }
            return result;

        }

        /// <summary>
        /// XML反序列化
        /// </summary>
        /// <param name="type">目标类型(Type类型)</param>
        /// <param name="filePath">XML文件路径</param>
        /// <returns>序列对象</returns>
        public static object DeserializeFromXML(Type type, string filePath)
        {
            FileStream fs = null;
            try
            {
                fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
                XmlSerializer serializer = new XmlSerializer(type);
                return serializer.Deserialize(fs);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (fs != null)
                    fs.Close();
            }
        }

        #endregion

        #region  水印,缩略图

        /// <summary>
        /// 获得当前系统安装的JPEG编码解码器
        /// </summary>
        /// <returns></returns>
        public static ImageCodecInfo GetJPEGCodec()
        {
            if (_isloadjpegcodec == true)
                return _jpegcodec;

            ImageCodecInfo[] codecsList = ImageCodecInfo.GetImageEncoders();
            foreach (ImageCodecInfo codec in codecsList)
            {
                if (codec.MimeType.IndexOf("jpeg") > -1)
                {
                    _jpegcodec = codec;
                    break;
                }

            }
            _isloadjpegcodec = true;
            return _jpegcodec;
        }

        /// <summary>
        /// 生成缩略图
        /// </summary>
        /// <param name="imagePath">图片路径</param>
        /// <param name="thumbPath">缩略图路径</param>
        /// <param name="width">缩略图宽度</param>
        /// <param name="height">缩略图高度</param>
        /// <param name="mode">生成缩略图的方式</param>
        public static void GenerateThumb(string imagePath, string thumbPath, int width, int height, string mode)
        {
            Image image = Image.FromFile(imagePath);

            string extension = imagePath.Substring(imagePath.LastIndexOf(".")).ToLower();
            ImageFormat imageFormat = null;
            switch (extension)
            {
                case ".jpg":
                case ".jpeg":
                    imageFormat = ImageFormat.Jpeg;
                    break;
                case ".bmp":
                    imageFormat = ImageFormat.Bmp;
                    break;
                case ".png":
                    imageFormat = ImageFormat.Png;
                    break;
                case ".gif":
                    imageFormat = ImageFormat.Gif;
                    break;
                default:
                    imageFormat = ImageFormat.Jpeg;
                    break;
            }

            int toWidth = width > 0 ? width : image.Width;
            int toHeight = height > 0 ? height : image.Height;

            int x = 0;
            int y = 0;
            int ow = image.Width;
            int oh = image.Height;

            switch (mode)
            {
                case "HW"://指定高宽缩放（可能变形）
                    break;
                case "W"://指定宽，高按比例
                    toHeight = image.Height * width / image.Width;
                    break;
                case "H"://指定高，宽按比例
                    toWidth = image.Width * height / image.Height;
                    break;
                case "Cut"://指定高宽裁减（不变形）
                    if ((double)image.Width / (double)image.Height > (double)toWidth / (double)toHeight)
                    {
                        oh = image.Height;
                        ow = image.Height * toWidth / toHeight;
                        y = 0;
                        x = (image.Width - ow) / 2;
                    }
                    else
                    {
                        ow = image.Width;
                        oh = image.Width * height / toWidth;
                        x = 0;
                        y = (image.Height - oh) / 2;
                    }
                    break;
                default:
                    break;
            }

            //新建一个bmp
            Image bitmap = new Bitmap(toWidth, toHeight);

            //新建一个画板
            Graphics g = Graphics.FromImage(bitmap);

            //设置高质量插值法
            g.InterpolationMode = InterpolationMode.High;

            //设置高质量,低速度呈现平滑程度
            g.SmoothingMode = SmoothingMode.HighQuality;

            //清空画布并以透明背景色填充
            g.Clear(Color.Transparent);

            //在指定位置并且按指定大小绘制原图片的指定部分
            g.DrawImage(image,
                        new Rectangle(0, 0, toWidth, toHeight),
                        new Rectangle(x, y, ow, oh),
                        GraphicsUnit.Pixel);

            try
            {
                bitmap.Save(thumbPath, imageFormat);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (g != null)
                    g.Dispose();
                if (bitmap != null)
                    bitmap.Dispose();
                if (image != null)
                    image.Dispose();
            }
        }

        /// <summary>
        /// 生成图片水印
        /// </summary>
        /// <param name="originalPath">源图路径</param>
        /// <param name="watermarkPath">水印图片路径</param>
        /// <param name="targetPath">保存路径</param>
        /// <param name="position">位置</param>
        /// <param name="opacity">透明度</param>
        /// <param name="quality">质量</param>
        public static void GenerateImageWatermark(string originalPath, string watermarkPath, string targetPath, int position, int opacity, int quality)
        {
            Image originalImage = null;
            Image watermarkImage = null;
            //图片属性
            ImageAttributes attributes = null;
            //画板
            Graphics g = null;
            try
            {

                originalImage = Image.FromFile(originalPath);
                watermarkImage = new Bitmap(watermarkPath);

                if (watermarkImage.Height >= originalImage.Height || watermarkImage.Width >= originalImage.Width)
                {
                    originalImage.Save(targetPath);
                    return;
                }

                if (quality < 0 || quality > 100)
                    quality = 80;

                //水印透明度
                float iii;
                if (opacity > 0 && opacity <= 10)
                    iii = (float)(opacity / 10.0F);
                else
                    iii = 0.5F;

                //水印位置
                int x = 0;
                int y = 0;
                switch (position)
                {
                    case 1:
                        x = (int)(originalImage.Width * (float).01);
                        y = (int)(originalImage.Height * (float).01);
                        break;
                    case 2:
                        x = (int)((originalImage.Width * (float).50) - (watermarkImage.Width / 2));
                        y = (int)(originalImage.Height * (float).01);
                        break;
                    case 3:
                        x = (int)((originalImage.Width * (float).99) - (watermarkImage.Width));
                        y = (int)(originalImage.Height * (float).01);
                        break;
                    case 4:
                        x = (int)(originalImage.Width * (float).01);
                        y = (int)((originalImage.Height * (float).50) - (watermarkImage.Height / 2));
                        break;
                    case 5:
                        x = (int)((originalImage.Width * (float).50) - (watermarkImage.Width / 2));
                        y = (int)((originalImage.Height * (float).50) - (watermarkImage.Height / 2));
                        break;
                    case 6:
                        x = (int)((originalImage.Width * (float).99) - (watermarkImage.Width));
                        y = (int)((originalImage.Height * (float).50) - (watermarkImage.Height / 2));
                        break;
                    case 7:
                        x = (int)(originalImage.Width * (float).01);
                        y = (int)((originalImage.Height * (float).99) - watermarkImage.Height);
                        break;
                    case 8:
                        x = (int)((originalImage.Width * (float).50) - (watermarkImage.Width / 2));
                        y = (int)((originalImage.Height * (float).99) - watermarkImage.Height);
                        break;
                    case 9:
                        x = (int)((originalImage.Width * (float).99) - (watermarkImage.Width));
                        y = (int)((originalImage.Height * (float).99) - watermarkImage.Height);
                        break;
                }

                //颜色映射表
                ColorMap colorMap = new ColorMap();
                colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
                colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
                ColorMap[] newColorMap = { colorMap };

                //颜色变换矩阵,iii是设置透明度的范围0到1中的单精度类型
                float[][] newColorMatrix ={
                                            new float[] {1.0f,  0.0f,  0.0f,  0.0f, 0.0f},
                                            new float[] {0.0f,  1.0f,  0.0f,  0.0f, 0.0f},
                                            new float[] {0.0f,  0.0f,  1.0f,  0.0f, 0.0f},
                                            new float[] {0.0f,  0.0f,  0.0f,  iii, 0.0f},
                                            new float[] {0.0f,  0.0f,  0.0f,  0.0f, 1.0f}
                                           };
                //定义一个 5 x 5 矩阵
                ColorMatrix matrix = new ColorMatrix(newColorMatrix);

                //图片属性
                attributes = new ImageAttributes();
                attributes.SetRemapTable(newColorMap, ColorAdjustType.Bitmap);
                attributes.SetColorMatrix(matrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);

                //画板
                g = Graphics.FromImage(originalImage);
                //绘制水印
                g.DrawImage(watermarkImage, new Rectangle(x, y, watermarkImage.Width, watermarkImage.Height), 0, 0, watermarkImage.Width, watermarkImage.Height, GraphicsUnit.Pixel, attributes);
                //保存图片
                EncoderParameters encoderParams = new EncoderParameters();
                encoderParams.Param[0] = new EncoderParameter(Encoder.Quality, new long[] { quality });
                if (GetJPEGCodec() != null)
                    originalImage.Save(targetPath, _jpegcodec, encoderParams);
                else
                    originalImage.Save(targetPath);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (g != null)
                    g.Dispose();
                if (attributes != null)
                    attributes.Dispose();
                if (watermarkImage != null)
                    watermarkImage.Dispose();
                if (originalImage != null)
                    originalImage.Dispose();
            }
        }

        /// <summary>
        /// 生成文字水印
        /// </summary>
        /// <param name="originalPath">源图路径</param>
        /// <param name="targetPath">保存路径</param>
        /// <param name="text">水印文字</param>
        /// <param name="textSize">文字大小</param>
        /// <param name="textFont">文字字体</param>
        /// <param name="position">位置</param>
        /// <param name="quality">质量</param>
        public static void GenerateTextWatermark(string originalPath, string targetPath, string text, int textSize, string textFont, int position, int quality)
        {
            Image originalImage = null;
            //画板
            Graphics g = null;
            try
            {
                originalImage = Image.FromFile(originalPath);
                //画板
                g = Graphics.FromImage(originalImage);
                if (quality < 0 || quality > 100)
                    quality = 80;

                Font font = new Font(textFont, textSize, FontStyle.Regular, GraphicsUnit.Pixel);
                SizeF sizePair = g.MeasureString(text, font);

                float x = 0;
                float y = 0;

                switch (position)
                {
                    case 1:
                        x = (float)originalImage.Width * (float).01;
                        y = (float)originalImage.Height * (float).01;
                        break;
                    case 2:
                        x = ((float)originalImage.Width * (float).50) - (sizePair.Width / 2);
                        y = (float)originalImage.Height * (float).01;
                        break;
                    case 3:
                        x = ((float)originalImage.Width * (float).99) - sizePair.Width;
                        y = (float)originalImage.Height * (float).01;
                        break;
                    case 4:
                        x = (float)originalImage.Width * (float).01;
                        y = ((float)originalImage.Height * (float).50) - (sizePair.Height / 2);
                        break;
                    case 5:
                        x = ((float)originalImage.Width * (float).50) - (sizePair.Width / 2);
                        y = ((float)originalImage.Height * (float).50) - (sizePair.Height / 2);
                        break;
                    case 6:
                        x = ((float)originalImage.Width * (float).99) - sizePair.Width;
                        y = ((float)originalImage.Height * (float).50) - (sizePair.Height / 2);
                        break;
                    case 7:
                        x = (float)originalImage.Width * (float).01;
                        y = ((float)originalImage.Height * (float).99) - sizePair.Height;
                        break;
                    case 8:
                        x = ((float)originalImage.Width * (float).50) - (sizePair.Width / 2);
                        y = ((float)originalImage.Height * (float).99) - sizePair.Height;
                        break;
                    case 9:
                        x = ((float)originalImage.Width * (float).99) - sizePair.Width;
                        y = ((float)originalImage.Height * (float).99) - sizePair.Height;
                        break;
                }

                g.DrawString(text, font, new SolidBrush(Color.White), x + 1, y + 1);
                g.DrawString(text, font, new SolidBrush(Color.Black), x, y);

                //保存图片
                EncoderParameters encoderParams = new EncoderParameters();
                encoderParams.Param[0] = new EncoderParameter(Encoder.Quality, new long[] { quality });
                if (GetJPEGCodec() != null)
                    originalImage.Save(targetPath, _jpegcodec, encoderParams);
                else
                    originalImage.Save(targetPath);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (g != null)
                    g.Dispose();
                if (originalImage != null)
                    originalImage.Dispose();
            }
        }

        #endregion
    }
}

c# Lambda操作类封装

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace EasyFrame.Common
{
    public static class LambdaCommon
    {
        #region 表达式工具
        /// <summary>
        /// 相当于&&操作
        /// ——Author：hellthinker
        /// </summary>
        /// <param name="thisFilter">已生成的过滤条件</param>
        /// <param name="otherFilter">未生成的过滤条件</param>
        /// <returns>新的过滤</returns>
        public static Expression GotoAndAlso(this Expression thisFilter, Expression otherFilter)
        {
            return Expression.AndAlso(thisFilter, otherFilter);
        }
        /// <summary>
        /// 相当于||操作
        /// ——Author：hellthinker
        /// </summary>
        /// <param name="thisFilter">已生成的过滤条件</param>
        /// <param name="otherFilter">未生成的过滤条件</param>
        /// <returns>新的过滤</returns>
        public static Expression GotoOrElse(this Expression thisFilter, Expression otherFilter)
        {
            return Expression.OrElse(thisFilter, otherFilter);
        }
        /// <summary>
        /// 相当于==操作
        /// ——Author：hellthinker
        /// </summary>
        /// <param name="thisParameterExpression">查询对象</param>
        /// <param name="propertieName">属性名称</param>
        /// <param name="propertieValue">属性值</param>
        /// <returns>新的过滤</returns>
        public static Expression GotoEqual(this ParameterExpression thisParameterExpression, string propertieName, object propertieValue)
        {
            return Expression.Equal(Expression.Property(thisParameterExpression, propertieName), Expression.Constant(propertieValue));
        }
        /// <summary>
        /// 相当于>=操作
        /// ——Author：hellthinker
        /// </summary>
        /// <param name="thisParameterExpression">查询对象</param>
        /// <param name="propertieName">属性名称</param>
        /// <param name="propertieValue">属性值</param>
        /// <returns>新的过滤</returns>
        public static Expression GotoGreaterThanOrEqual<T>(this ParameterExpression thisParameterExpression, string propertieName, object propertieValue)
        {
            //大于或等于
            return Expression.GreaterThanOrEqual(Expression.Property(thisParameterExpression, propertieName), Expression.Constant(propertieValue, typeof(T)));
        }
        /// <summary>
        /// 相当于小于等于操作
        /// ——Author：hellthinker
        /// </summary>
        /// <param name="thisParameterExpression">查询对象</param>
        /// <param name="propertieName">属性名称</param>
        /// <param name="propertieValue">属性值</param>
        /// <returns>新的过滤</returns>
        public static Expression GotoLessThanOrEqual<T>(this ParameterExpression thisParameterExpression, string propertieName, object propertieValue)
        {
            //小于或等于
            return Expression.LessThanOrEqual(Expression.Property(thisParameterExpression, propertieName), Expression.Constant(propertieValue, typeof(T)));
        }
        /// <summary>
        /// 相当于!=操作
        /// ——Author：hellthinker
        /// </summary>
        /// <param name="thisParameterExpression">查询对象</param>
        /// <param name="propertieName">属性名称</param>
        /// <param name="propertieValue">属性值</param>
        /// <returns>新的过滤</returns>
        public static Expression GotoNotEqual(this ParameterExpression thisParameterExpression, string propertieName, object propertieValue)
        {
            return Expression.NotEqual(Expression.Property(thisParameterExpression, propertieName), Expression.Constant(propertieValue));
        }

        /// <summary>
        /// 相当于>=操作
        /// ——Author：hellthinker
        /// </summary>
        /// <param name="thisParameterExpression">查询对象</param>
        /// <param name="propertieName">属性名称</param>
        /// <param name="propertieValue">属性值</param>
        /// <returns>新的过滤</returns>
        public static Expression GotoGreaterThanOrEqual(this ParameterExpression thisParameterExpression, string propertieName, object propertieValue)
        {
            //大于或等于
            return Expression.GreaterThanOrEqual(Expression.Property(thisParameterExpression, propertieName), Expression.Constant(propertieValue));
        }
        /// <summary>
        /// 相当于>操作
        /// ——Author：hellthinker
        /// </summary>
        /// <param name="thisParameterExpression">查询对象</param>
        /// <param name="propertieName">属性名称</param>
        /// <param name="propertieValue">属性值</param>
        /// <returns>新的过滤</returns>
        public static Expression GotoGreaterThan<T>(this ParameterExpression thisParameterExpression, string propertieName, object propertieValue)
        {
            //大于
            return Expression.GreaterThan(Expression.Property(thisParameterExpression, propertieName), Expression.Constant(propertieValue, typeof(T)));
        }
        /// <summary>
        /// 相当于小于操作
        /// ——Author：hellthinker
        /// </summary>
        /// <param name="thisParameterExpression">查询对象</param>
        /// <param name="propertieName">属性名称</param>
        /// <param name="propertieValue">属性值</param>
        /// <returns>新的过滤</returns>
        public static Expression GotoLessThan<T>(this ParameterExpression thisParameterExpression, string propertieName, object propertieValue)
        {
            //小于
            return Expression.LessThan(Expression.Property(thisParameterExpression, propertieName), Expression.Constant(propertieValue, typeof(T)));
        }
        /// <summary>
        /// 相当于>=操作
        /// ——Author：hellthinker
        /// </summary>
        /// <param name="thisParameterExpression">查询对象</param>
        /// <param name="propertieName">属性名称</param>
        /// <param name="propertieValue">属性值</param>
        /// <returns>新的过滤</returns>
        public static Expression GotoGreaterThanOrEqualByDateTime(this ParameterExpression thisParameterExpression, string propertieName, object propertieValue)
        {
            //大于或等于
            return Expression.GreaterThanOrEqual(Expression.Property(thisParameterExpression, propertieName), Expression.Constant(propertieValue, typeof(DateTime?)));
        }
        /// <summary>
        /// 字符串包含
        /// </summary>
        /// <param name="thisParameterExpression">查询对象</param>
        /// <param name="propertieName">属性名称</param>
        /// <param name="propertieValue">属性值</param>
        /// <returns>新的过滤</returns>
        public static Expression GotoContains(this ParameterExpression thisParameterExpression, string propertieName, object propertieValue)
        {
            return Expression.Call(Expression.Property(thisParameterExpression, propertieName), typeof(string).GetMethod("Contains"), Expression.Constant(propertieValue));
        }

        /// <summary>
        /// 相当于小于或等于操作
        /// ——Author：hellthinker
        /// </summary>
        /// <param name="thisParameterExpression">查询对象</param>
        /// <param name="propertieName">属性名称</param>
        /// <param name="propertieValue">属性值</param>
        /// <returns>新的过滤</returns>
        public static Expression GotoLessThanOrEqualByDateTime(this ParameterExpression thisParameterExpression, string propertieName, object propertieValue)
        {
            //小于或等于
            return Expression.LessThanOrEqual(Expression.Property(thisParameterExpression, propertieName), Expression.Constant(propertieValue, typeof(DateTime?)));
        }
        /// <summary>
        /// 相当于>操作
        /// ——Author：hellthinker
        /// </summary>
        /// <param name="thisParameterExpression">查询对象</param>
        /// <param name="propertieName">属性名称</param>
        /// <param name="propertieValue">属性值</param>
        /// <returns>新的过滤</returns>
        public static Expression GotoGreaterThanByDateTime(this ParameterExpression thisParameterExpression, string propertieName, object propertieValue)
        {
            //大于
            return Expression.GreaterThan(Expression.Property(thisParameterExpression, propertieName), Expression.Constant(propertieValue, typeof(DateTime?)));
        }
        /// <summary>
        /// 相当于小于操作
        /// ——Author：hellthinker
        /// </summary>
        /// <param name="thisParameterExpression">查询对象</param>
        /// <param name="propertieName">属性名称</param>
        /// <param name="propertieValue">属性值</param>
        /// <returns>新的过滤</returns>
        public static Expression GotoLessThanByDateTime(this ParameterExpression thisParameterExpression, string propertieName, object propertieValue)
        {
            //小于
            return Expression.LessThan(Expression.Property(thisParameterExpression, propertieName), Expression.Constant(propertieValue, typeof(DateTime?)));
        }
        /// <summary>
        /// 包含操作 相当余 a=> arr.Contains(a.ID)
        /// </summary>
        /// <param name="thisParameterExpression"></param>
        /// <param name="propertieName"></param>
        /// <param name="propertieValue"></param>
        /// <returns></returns>
        public static Expression ContainsOperations(this ParameterExpression thisParameterExpression, string propertieName, object propertieValue)
        {
            MethodInfo method = null;
            MemberExpression member = Expression.Property(thisParameterExpression, propertieName);
            var containsMethods = typeof(Enumerable).GetMethods(BindingFlags.Static | BindingFlags.Public).Where(m => m.Name == "Contains");
            foreach (var m in containsMethods)
            {
                if (m.GetParameters().Count() == 2)
                {
                    method = m;
                    break;
                }
            }
            method = method.MakeGenericMethod(member.Type);
            var exprContains = Expression.Call(method, new Expression[] { Expression.Constant(propertieValue), member });
            return exprContains;
        }

        /// <summary>
        /// 包含操作 相当于  a=>a.ID.Contains(key)
        /// </summary>
        /// <param name="thisParameterExpression"></param>
        /// <param name="propertieName"></param>
        /// <param name="propertieValue"></param>
        /// <returns></returns>
        public static Expression Contains(this ParameterExpression thisParameterExpression, string propertieName, object propertieValue)
        {
            var propertyExp = Expression.Property(thisParameterExpression, propertieName);
            MethodInfo method = typeof(string).GetMethod("Contains", new[] { typeof(string) });
            var someValue = Expression.Constant(propertieValue, typeof(string));
            var containsMethodExp = Expression.Call(propertyExp, method, someValue);
            return containsMethodExp;
        }
        #endregion
    }
}

C# -- 使用反射（Reflect）获取dll文件中的类型并调用方法

使用反射（Reflect）获取dll文件中的类型并调用方法

需引用：System.Reflection;

1. 使用反射（Reflect）获取dll文件中的类型并调用方法（入门案例）

 1         static void Main(string[] args)
 2         {
 3             //dll文件路径
 4             string path = @"D:\VS2015Project\001\Computer\bin\Debug\computer.dll";
 5
 6             //加载dll文件
 7             Assembly asm = Assembly.LoadFile(path);
 8
 9             //获取类
10             Type type = asm.GetType("Computer.Computer");
11
12             //创建该类型的实例
13             object obj = Activator.CreateInstance(type);
14
15             //获取该类的方法
16             MethodInfo mf = type.GetMethod("ShowDrives");
17
18             //调用方法
19             mf.Invoke(obj, null);
20
21             Console.ReadKey();
22         }

2. 生成类库(computer.dll)的computer.cs文件代码

 1 using System;
 2 using System.Collections.Generic;
 3 using System.IO;
 4 using System.Linq;
 5 using System.Text;
 6
 7
 8 namespace Computer
 9 {
10     public class Computer
11     {
12         private DriveInfo[] drives;
13         public Computer()
14         {
15             this.drives = DriveInfo.GetDrives();
16         }
17         public void ShowDrives()
18         {
19             Console.WriteLine("该电脑的磁盘驱动器有：\r\n");
20             foreach (var item in drives)
21             {
22                 Console.WriteLine(item);
23             }
24         }
25     }
26 }

3. 反射调用结果：

C# -- 文件的压缩与解压（GZipStream）

文件的压缩与解压

需引入 System.IO.Compression;

1.C#代码（入门案例）

 1             Console.WriteLine("压缩文件...............");
 2             using (FileStream fr = File.OpenRead("d:\\test.txt"))
 3             {
 4                 using (FileStream fw = File.OpenWrite("d:\\test.zip"))
 5                 {
 6                     using (GZipStream gz = new GZipStream(fw, CompressionMode.Compress))
 7                     {
 8
 9                         byte[] by = new byte[1024 * 1024];
10                         int r = fr.Read(by, 0, by.Length);
11                         while (r > 0)
12                         {
13                             gz.Write(by, 0, r);
14                             r = fr.Read(by, 0, r);
15                         }
16                     }
17                 }
18             }
19             Console.WriteLine("压缩完成。");
20
21
22             Console.WriteLine("解压文件...............");
23             using (FileStream fr = File.OpenRead("d:\\test.zip"))
24             {
25                 using (GZipStream gz = new GZipStream(fr, CompressionMode.Decompress))
26                 {
27                     using (FileStream fw = File.OpenWrite("d:\\test2.txt"))
28                     {
29
30                         byte[] by = new byte[1024 * 1024];
31                         int r = gz.Read(by, 0, by.Length);
32                         while (r > 0)
33                         {
34                             fw.Write(by, 0, r);
35                             r = gz.Read(by, 0, r);
36                         }
37                     }
38                 }
39             }
40             Console.WriteLine("解压完成。");
41
42             Console.ReadKey();

2. 运行结果