经过一个多星期的研究，各种查找资料终于自己实现了Jquery  Ajax Json ashx 的前后台数据交流功能

首先一点，Ajax只能对应一个ashx文件，多余两个，如果打开异步传输的async: true,第二个无法返回数据。

第二post和get的方式除了w3shcool中说的HTTP 方法：GET 对比 POST，在后台的代码上也有一定的区分

使用Jquery封装的Ajax比较简单，Json需要解析。

1.新建类Jsonconvert.cs，用于Json的解析和转换

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Web;usingSystem.Runtime.Serialization;usingSystem.Runtime.Serialization.Json;usingSystem.ServiceModel.Web;using System.IO;//MemoryStream

using System.Text;//StringBuilder

///

///Json 的摘要说明///

public static classJsonconn

{public static string ToJsJson(this objectitem) {

DataContractJsonSerializer serializer= newDataContractJsonSerializer(item.GetType());using (MemoryStream ms = newMemoryStream()) {

serializer.WriteObject(ms, item);

StringBuilder sb= newStringBuilder();

sb.Append(Encoding.UTF8.GetString(ms.ToArray()));returnsb.ToString();

}

}///

///Json反序列化,用于接收客户端Json后生成对应的对象///

public static T FromJsonTo(this stringjsonString) {

DataContractJsonSerializer ser= new DataContractJsonSerializer(typeof(T));

MemoryStream ms= newMemoryStream(Encoding.UTF8.GetBytes(jsonString));

T jsonObject=(T)ser.ReadObject(ms);

ms.Close();returnjsonObject;

}

}

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2.新建类用于保存属性

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Web;///

///data 的摘要说明///

public classdata

{publicdata()

{//

//TODO: 在此处添加构造函数逻辑//}public string d { get; set; }

}

3.前台Ajax的写法

$.ajax({

url:'Ashx/Registerlastchk.ashx',

type:'post',//contentType: "application/json; charset=utf-8",

data: {username:$("#Username").val(),password: $("#Password").val(),email:$("#signup_email").val(),pass:1} ,

datatype:"json",

async:true,

beforeSend:function() {

$("#div_signing").show();

$('#SignUpButton').attr('disabled', "true"); //添加disabled属性

},

error:function(data){

$("#div_signing_info").html("连接服务器失败");

},

success:function(data) {var datastring = JSON.parse(data);//******很多代码都丢了这段

alter(datastring.d) ;

}

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4.ashx中的写法：

usingSystem;usingSystem.Web;usingSystem.Collections.Generic;usingSystem.Web.UI;usingSystem.Web.UI.WebControls;usingSystem.Runtime.Serialization;usingSystem.Runtime.Serialization.Json;usingSystem.ServiceModel.Web;using System.IO;//MemoryStream

using System.Text;//StringBuilder

///

///建立新用户///

public classRegisterlastchk : IHttpHandler {///

///先检查名称，建立新用户///

///

public voidProcessRequest (HttpContext context) {string pass = GetJsonClient("pass", context);if (pass == "1") {string password = GetJsonClient("password", context);string email = GetJsonClient("email", context);string name = GetJsonClient("username", context);

data reajax=newdata();var manager = newRegisterck();if (string.IsNullOrEmpty(name)) {throw new Exception("Username is empty");

}if(manager.Checkname(name)) {

NewUser signnew= newNewUser();var result =signnew.signnewuser(name, password, email);if(result) {

reajax.d= "1";//注册完成

context.Response.Write(reajax.ToJsJson());

}else{

reajax.d= "0"; //注册失败

context.Response.Write(reajax.ToJsJson());

}

}else{

reajax.d= "-1"; //用户名存在

context.Response.Write(reajax.ToJsJson());

}

}

}public string GetJsonClient(stringname, HttpContext context) {

context.Response.ContentType= "text/plain";

context.Response.Charset= "utf-8";if (context.Request[name] == null) { return null; }string temp =context.Request[name];returntemp;

}///

///Json序列化,用于发送到客户端///

public boolIsReusable {get{return true;

}

}

}

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post的时候原来是datatype是Json，ContentType 最好为"text/plain"，试过“Aplication/Json”无获得数据，但是get方式时候可以货到，Post时候为null，原因不明，应该使用方法中 T FromJsonTo，也是极好的，还未做实验，今天太晚了，明天试试

context.Response.ContentType = "text/plain";

context.Response.Charset= "utf-8";