- public static class DataTableExtensions
- {
- /// <summary>
- /// 转化一个DataTable
- /// </summary>
- /// <typeparam name="T"></typeparam>
- /// <param name="list"></param>
- /// <returns></returns>
- public static DataTable ToDataTable<T>(this IEnumerable<T> list)
- {
- //创建属性的集合
- List<PropertyInfo> pList = new List<PropertyInfo>();
- //获得反射的入口
- Type type = typeof(T);
- DataTable dt = new DataTable();
- //把所有的public属性加入到集合 并添加DataTable的列
- Array.ForEach<PropertyInfo>(type.GetProperties(), p => { pList.Add(p); dt.Columns.Add(p.Name, p.PropertyType); });
- foreach (var item in list)
- {
- //创建一个DataRow实例
- DataRow row = dt.NewRow();
- //给row 赋值
- pList.ForEach(p => row[p.Name] = p.GetValue(item, null));
- //加入到DataTable
- dt.Rows.Add(row);
- }
- return dt;
- }
- /// <summary>
- /// DataTable 转换为List 集合
- /// </summary>
- /// <typeparam name="TResult">类型</typeparam>
- /// <param name="dt">DataTable</param>
- /// <returns></returns>
- public static List<T> ToList<T>(this DataTable dt) where T : class, new()
- {
- //创建一个属性的列表
- List<PropertyInfo> prlist = new List<PropertyInfo>();
- //获取TResult的类型实例 反射的入口
- Type t = typeof(T);
- //获得TResult 的所有的Public 属性 并找出TResult属性和DataTable的列名称相同的属性(PropertyInfo) 并加入到属性列表
- Array.ForEach<PropertyInfo>(t.GetProperties(), p => { if (dt.Columns.IndexOf(p.Name) != -1) prlist.Add(p); });
- //创建返回的集合
- List<T> oblist = new List<T>();
- foreach (DataRow row in dt.Rows)
- {
- //创建TResult的实例
- T ob = new T();
- //找到对应的数据 并赋值
- prlist.ForEach(p => { if (row[p.Name] != DBNull.Value) p.SetValue(ob, row[p.Name], null); });
- //放入到返回的集合中.
- oblist.Add(ob);
- }
- return oblist;
- }
- /// <summary>
- /// 将集合类转换成DataTable
- /// </summary>
- /// <param name="list">集合</param>
- /// <returns></returns>
- public static DataTable ToDataTableTow(IList list)
- {
- DataTable result = new DataTable();
- if (list.Count > 0)
- {
- PropertyInfo[] propertys = list[0].GetType().GetProperties();
- foreach (PropertyInfo pi in propertys)
- {
- result.Columns.Add(pi.Name, pi.PropertyType);
- }
- for (int i = 0; i < list.Count; i++)
- {
- ArrayList tempList = new ArrayList();
- foreach (PropertyInfo pi in propertys)
- {
- object obj = pi.GetValue(list[i], null);
- tempList.Add(obj);
- }
- object[] array = tempList.ToArray();
- result.LoadDataRow(array, true);
- }
- }
- return result;
- }
- /**/
- /// <summary>
- /// 将泛型集合类转换成DataTable
- /// </summary>
- /// <typeparam name="T">集合项类型</typeparam>
- /// <param name="list">集合</param>
- /// <returns>数据集(表)</returns>
- public static DataTable ToDataTable<T>(IList<T> list)
- {
- return ToDataTable<T>(list, null);
- }
- /**/
- /// <summary>
- /// 将泛型集合类转换成DataTable
- /// </summary>
- /// <typeparam name="T">集合项类型</typeparam>
- /// <param name="list">集合</param>
- /// <param name="propertyName">需要返回的列的列名</param>
- /// <returns>数据集(表)</returns>
- public static DataTable ToDataTable<T>(IList<T> list, params string[] propertyName)
- {
- List<string> propertyNameList = new List<string>();
- if (propertyName != null)
- propertyNameList.AddRange(propertyName);
- DataTable result = new DataTable();
- if (list.Count > 0)
- {
- PropertyInfo[] propertys = list[0].GetType().GetProperties();
- foreach (PropertyInfo pi in propertys)
- {
- if (propertyNameList.Count == 0)
- {
- result.Columns.Add(pi.Name, pi.PropertyType);
- }
- else
- {
- if (propertyNameList.Contains(pi.Name))
- result.Columns.Add(pi.Name, pi.PropertyType);
- }
- }
- for (int i = 0; i < list.Count; i++)
- {
- ArrayList tempList = new ArrayList();
- foreach (PropertyInfo pi in propertys)
- {
- if (propertyNameList.Count == 0)
- {
- object obj = pi.GetValue(list[i], null);
- tempList.Add(obj);
- }
- else
- {
- if (propertyNameList.Contains(pi.Name))
- {
- object obj = pi.GetValue(list[i], null);
- tempList.Add(obj);
- }
- }
- }
- object[] array = tempList.ToArray();
- result.LoadDataRow(array, true);
- }
- }
- return result;
- }
- }