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

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

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

ms.Close();

return jsonObject;

}

实体类
代码如下:
[DataContract]
public class TestObj
{
[DataMember]
public string make { get; set; }
[DataMember]
public string model { get; set; }
[DataMember]
public int year { get; set; }
[DataMember]
public string color { get; set; }
}

------------------javascript获取Json--------------------

javascript调用测试代码
代码如下:
$('#getJson').click(function() {
$.ajax({
url: "getJsonHandler.ashx",
type: 'GET',
data: {},
dataType: 'json',
timeout: 1000,
error: function(XMLHttpRequest, textStatus, errorThrown) { alert(textStatus) },
success: function(result) {

alert(result.make);
alert(result.model);
alert(result.year);
alert(result.color);
}

});
});

C#后台生成代码
代码如下:
public class getJsonHandler: IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
TestObj obj = new TestObj();

obj.make = "Make is Value";
obj.model = "Model is Value";
obj.year = 999;
obj.color = "Color is Value";

context.Response.Write(obj.ToJsJson());
}
public bool IsReusable
{
get
{
return false;
}
}
}

//返回值为 {"color":"Color is Value","make":"Make is Value","model":"Model is Value","year":999}

-----------------C#由Json生成对象-----------------------

javascript调用测试代码
代码如下:
$('#postJson').click(function() {

var m_obj = { make: "Dodge", model: "Coronet R/T", year: 1968, color: "yellow" };
var jsonStr = JSON.stringify(m_obj); //用Json2.js生成Json字符串

$.ajax({
url: "postJsonHandler.ashx",
type: 'POST',
data: { postjson: jsonStr },
dataType: 'json',
timeout: 1000,
error: function(XMLHttpRequest, textStatus, errorThrown) { alert(textStatus) },
success: function(result) {

alert(result.success);
}

});
});

C#后台生成代码
代码如下:
public class postJsonHandler: IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
string jsonStr = context.Request["postjson"];

TestObj obj = jsonStr.FromJsonTo();

if (string.IsNullOrEmpty(obj.make) || string.IsNullOrEmpty(obj.model) || string.IsNullOrEmpty(obj.color)

|| obj.year < 0)
{
context.Response.Write("{success:false}");
}
else
{
context.Response.Write("{success:true}");
}

public bool IsReusable
{
get
{
return false;
}
}
}

使用Json时需要注意,服务器端拼凑生成Json字符串时,一定要注意把字符串用\"\"包裹,不然客户端接收时肯定会报错,根据Json字符串生成对象,是根据对应的名称赋值,多于或少于都不会报错.