.net中解析json 之 DataContractJsonSerializer类

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json 是轻量级的文本传输格式，一般用于前台和后台的数据交换

DataContractJsonSerializer是fm3.5中专门对json序列化和反序列化的类，以下是DataContractJsonSerializer的简单应用

假设客户端有个json对象，通过ajax传到后台，后台解析

代码如下：

            var people = [{ "UserName": "t1", "PassWord": "111111", "Sex": "男" },{ "UserName": "t2", "PassWord": "222222", "Sex": "女" }];            var url = "Default.aspx?people=" + escape(people.toJSONString());            request.open("POST", url, true);            request.onreadystatechange = updatePage;            request.send(null);

toJSONString函数正常运行得引用json.js

后台代码：

新建测试类 testobj （testobj中的属性和客户端传递过来的一致）

[DataContract]//序列化public class TestObj{    [DataMember]    public string UserName { get; set; }     [DataMember]    public string PassWord { get; set; }     [DataMember]    public string Sex { get; set; }public TestObj(string u,string p,string s){        UserName = u;        PassWord = p;        Sex = s;}}

新建序列化和反序列化方法

//json 序列化    public static string ToJsJson(object item)    {        DataContractJsonSerializer serializer = new DataContractJsonSerializer(item.GetType());        using(MemoryStream ms=new MemoryStream())        {            serializer.WriteObject(ms, item);            StringBuilder sb = new StringBuilder();            sb.Append(Encoding.UTF8.GetString(ms.ToArray()));            return sb.ToString();        }    }    //反序列化    public static T FromJsonTo<T>(string jsonString)    {        DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));        using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString)))        {            T jsonObject = (T)ser.ReadObject(ms);            return jsonObject;        }    }

调用：

反序列化json（解析）注：people即客户端传递过来

 //获取json字符串        string jsonStr = Request["people"];        List<TestObj> obj = Json.FromJsonTo<List<TestObj>>(jsonStr);        foreach (TestObj item in obj)            {         Response.Write(string.Format("UserName:{0}，Password:{1}，Sex:{2}/r/n", item.UserName, item.PassWord, item.Sex));            }        Response.End();

序列化成json字符串

        List<TestObj> Users = new List<TestObj>();        Users.Add(new TestObj("t1", "1", "男"));        Users.Add(new TestObj("t2", "2", "女"));        string json = Json.ToJsJson(Users);        Response.Write(json);        Response.End();

前台获取后台返回的json字符串：

  function updatePage() {            if (request.readyState == 4) {                if (request.status == 200) {                    var response = request.responseText;                    //转化成对象                    //方法1                        response = response.parseJSON();                    //方法2                    // response = eval("(" + response + ")");                    //对象访问方式                    document.getElementById("d1").innerHTML = response[1].Sex;                    //直接输出                   // document.getElementById("d1").innerHTML = response;                }            }        }

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