Json数据格式,简单而强大。
使用Json,不得不提到Newtonsoft.Json,它帮助我们更方便的使用Json,当然,不使用它也是可以的,还有许多方法将对象序列化成Json字符串,暂且不提。
我使用Json主要是在两个方面:
第一,在后台代码,用JsonConvert.SerializeObject()方法将对象序列化成字符串对象,然后在前台代码中,再用Json.Parse()方法反序列成javascript对象,然后处理对象;这种情况往往是在读数据库时会需要的,例如,列表页面;
第二,在前台代码,将javascript对象利用Json.stringify()方法序列化成字符串,然后传输到,后台代码中,再用JsonConvert.DeserializeObject<T>()方法反序列化成对象,然后处理对象;这种情况往往是在往数据库增加或者修改数据时需要的,例如,增加页面;
在这个过程中,需要注意的是:
1、在后台定义的对象与前台定义的对象,名称要相同,大小可以不一样;
另外需要啰嗦两句的是,我写的示例功能都是从公司的项目中,抽出来的一点功能点,然后用自己的想法来操作实现的,通过这样的练习,才可以慢慢地提高自己;另外,每个练习都是认真的按照大项目的编码规范去做的,例如,项目命名规范;编辑命名规范等等。
本示例主要是实现了上面两个方法:显示数据和保存数据,注意没有连接数据库,只是传输一下数据而已。
好吧,下面就不废话,贴上代码说明问题:
CodeSetupEdit.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="CodeSetupEdit.aspx.cs" Inherits="CodeSetup.CodeSetupEdit" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<script src="js/jquery-1.9.1.js"></script>
<script src="js/ajaxhelper.js"></script>
<script>
$(document).ready(function () {
ajaxmethod("../Handler/CodeSetupHandler.ashx?actiontype=getlist", function (data) {
var obj = JSON.parse(data);
$("#txtContext").val("编码选项是:" + obj.CodeOption + ";占位符是:" + obj.PlaceHolder + ";长度是:" + obj.Length + ";是否连号:" + obj.IsNeedContinuous);
});
});
var CodeSetup = function (codeoption, placeholder, length, isneedcontinuous) {
this.CodeOption = codeoption,
this.PlaceHolder = placeholder,
this.Length = length,
this.IsNeedContinuous = isneedcontinuous
} function save() {
var url = "../Handler/CodeSetupHandler.ashx?actiontype=save";
var codesetupEntity = new CodeSetup(, "yyyy", , );
$.post(url,
{
CodeSetupEntity: JSON.stringify(codesetupEntity),
}, function (data) { }, "text");
}
</script> </head>
<body>
<form id="form1" runat="server">
<div>
<textarea id="txtContext" style="height: 50px; width: 300px;"></textarea>
<input type="button" id="btnSave" value="保存" onclick="save()" />
</div>
</form>
</body>
</html>
CodeSetupHandler.ashx
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq; namespace CodeSetup.Handler
{
/// <summary>
/// CodeSetupHandler 的摘要说明
/// </summary>
public class CodeSetupHandler : IHttpHandler
{ public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
string action = context.Request["actiontype"] ?? context.Request["actiontype"].ToString();
switch (action)
{ case "getlist":
context.Response.Write(GetModel());
break;
case "save":
Save();
break;
default:
break;
} } public string GetModel()
{
var codeSetup = new CodeSetup()
{
CodeOption = (int)CodeOptionType.Date,
IsNeedContinuous = ,
Length = ,
placeHolder = ((int)DateType.YYYYMMDD).ToString()
};
return JsonConvert.SerializeObject(codeSetup);
} public void Save()
{
string codesetupentity = HttpContext.Current.Request.Form["CodeSetupEntity"];
JObject o = JObject.Parse(codesetupentity.ToString());
//string codeoption = o["CodeOption"].ToString();
//string placeholder = o["PlaceHolder"].ToString();
//string length = o["Length"].ToString();
//string isneedcontinuous = o["IsNeedContinuous"].ToString();
CodeSetup codeSetup = JsonConvert.DeserializeObject<CodeSetup>(codesetupentity); }
public bool IsReusable
{
get
{
return false;
}
}
} public class CodeSetup
{
public int CodeOption { get; set; }
public string placeHolder { get; set; }
public int Length { get; set; }
public int IsNeedContinuous { get; set; }
} public enum CodeOptionType
{ /// <summary>
/// 自定义
/// </summary>
[Description("自定义")]
Define = ,
/// <summary>
/// 日期
/// </summary>
[Description("日期")]
Date = ,
/// <summary>
/// 分隔符
/// </summary>
[Description("分隔符")]
Separator = ,
/// <summary>
/// 流水号
/// </summary>
[Description("流水号")]
Number = ,
}
public enum DateType
{ /// <summary>
/// 年月日
/// </summary>
[Description("年月日")]
YYYYMMDD = ,
/// <summary>
/// 年月
/// </summary>
[Description("年月")]
YYYYMM = ,
/// <summary>
/// 年
/// </summary>
[Description("年")]
YYYY = ,
/// <summary>
/// 月
/// </summary>
[Description("月")]
MM = ,
/// <summary>
/// 日
/// </summary>
[Description("日")]
DD = , }
public enum SeparatorType
{ /// <summary>
/// _
/// </summary>
[Description("下划线")]
Underline = ,
/// <summary>
/// -
/// </summary>
[Description("短横线")]
Hyphen = ,
} /// <summary>
/// 枚举工具类
/// </summary>
public sealed class EnumUtil
{
private static Dictionary<string, Dictionary<int, string>> _EnumList = new Dictionary<string, Dictionary<int, string>>(); //枚举缓存池 /// <summary>
/// 将枚举绑定到ListControl
/// </summary>
/// <param name="listControl">ListControl</param>
/// <param name="enumType">枚举类型</param>
public static void FillListControl(ListControl listControl, Type enumType)
{
listControl.Items.Clear();
listControl.DataSource = EnumToDictionary(enumType);
listControl.DataValueField = "key";
listControl.DataTextField = "value";
listControl.DataBind();
} /// <summary>
/// 将枚举转换成Dictionary<int, string>
/// Dictionary中,key为枚举项对应的int值;value为:若定义了EnumShowName属性,则取它,否则取name
/// </summary>
/// <param name="enumType">枚举类型</param>
/// <returns></returns>
public static Dictionary<int, string> EnumToDictionary(Type enumType)
{
string keyName = enumType.FullName; if (!_EnumList.ContainsKey(keyName))
{
Dictionary<int, string> list = new Dictionary<int, string>(); foreach (int i in Enum.GetValues(enumType))
{
string name = Enum.GetName(enumType, i); //取显示名称
string showName = string.Empty;
object[] atts = enumType.GetField(name).GetCustomAttributes(typeof(DescriptionAttribute), false);
if (atts.Length > ) showName = ((DescriptionAttribute)atts[]).Description; list.Add(i, string.IsNullOrEmpty(showName) ? name : showName);
} object syncObj = new object(); if (!_EnumList.ContainsKey(keyName))
{
lock (syncObj)
{
if (!_EnumList.ContainsKey(keyName))
{
_EnumList.Add(keyName, list);
}
}
}
} return _EnumList[keyName];
} /// <summary>
/// 获取枚举值对应的显示名称
/// </summary>
/// <param name="enumType">枚举类型</param>
/// <param name="intValue">枚举项对应的int值</param>
/// <returns></returns>
public static string GetDescription(Type enumType, int intValue)
{
return EnumToDictionary(enumType)[intValue];
}
}
}
贴完代码后,才发现里面还有几段代码与写的这个示例是不相关的,主要是枚举的一个工具类,这个大家可以忽略就行。