学步园

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" }];<br /> var url = "Default.aspx?people=" + escape(people.toJSONString());<br /> request.open("POST", url, true);<br /> request.onreadystatechange = updatePage;<br /> request.send(null);<br />

toJSONString函数正常运行得引用json.js

   <script src="json.js" type="text/javascript"></script>

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<br /> public class TestObj<br /> {<br /> [DataMember]<br /> public string UserName { get; set; }<br /> [DataMember]<br /> public string PassWord { get; set; }<br /> [DataMember]<br /> public string Sex { get; set; }</p> <p>public TestObj(string u,string p,string s)<br /> {<br /> UserName = u;<br /> PassWord = p;<br /> Sex = s;<br /> }<br /> }<br />

新建序列化和反序列化方法

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

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

序列化成json字符串

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

前台获取后台返回的json字符串：

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