Silverlight中使用Json

1. 建立AjaxEnabled-WCF service。

<%@ <a href="http://code.js-code.com/tag/servi/" target="_blank" class="keywords">servi</a>ceHost Language="C#" Debug="true" <a href="http://code.js-code.com/tag/servi/" target="_blank" class="keywords">servi</a>ce="JsonTest.Web.WCF<a href="http://code.js-code.com/tag/servi/" target="_blank" class="keywords">servi</a>ce<a href="http://code.js-code.com/tag/SU/" target="_blank" class="keywords">S.U</a>ser<a href="http://code.js-code.com/tag/servi/" target="_blank" class="keywords">servi</a>ce" CodeBehind="User<a href="http://code.js-code.com/tag/servi/" target="_blank" class="keywords">servi</a>ce.svc.cs" Factory="Sy<a href="http://code.js-code.com/tag/stem/" target="_blank" class="keywords">stem</a>.<a href="http://code.js-code.com/tag/servi/" target="_blank" class="keywords">servi</a>ceMode<a href="http://code.js-code.com/tag/l/" target="_blank" class="keywords">l.</a>Activation.Web<a href="http://code.js-code.com/tag/servi/" target="_blank" class="keywords">servi</a>ceHostFactory" %>

Factory="System.serviceModel.Activation.WebserviceHostFactory" 是必须要的。

2. 注释web.config中的enableWebScript节点,如下:
<behaviors> <endpointBehaviors> <behavior name="JsonTest.Web.WCF<a href="http://code.js-code.com/tag/servi/" target="_blank" class="keywords">servi</a>ce<a href="http://code.js-code.com/tag/SU/" target="_blank" class="keywords">S.U</a>ser<a href="http://code.js-code.com/tag/servi/" target="_blank" class="keywords">servi</a>ceAspNetAjaxBehavior"> <!--<enableWebScript />--> </behavior> </endpointBehaviors> </behaviors>

以上两步是为了为了支持形如下面的请求链接方式：

http://localhost:2579/WCFServices/UserService.svc/GetUser

在浏览器中直接输入该URL，就会返回JSON数据。

3. 建立DataContract

[DataContract] public class UserInfo <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> [DataMember] public <a href="http://code.js-code.com/tag/Stri/" target="_blank" class="keywords">Stri</a>ng Name <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> get; set; } [DataMember] public <a href="http://code.js-code.com/tag/Stri/" target="_blank" class="keywords">Stri</a>ng Address <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> get; set; } [DataMember] public <a href="http://code.js-code.com/tag/inta/" target="_blank" class="keywords">int a</a>ge <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> get; set; } [DataMember] public bool IsMember <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> get; set; } }

4. WCF service 代码：

[<a href="http://code.js-code.com/tag/servi/" target="_blank" class="keywords">servi</a>ceContract(Namespace = "")] [AspNetCompatibility<a href="http://code.js-code.com/tag/requ/" target="_blank" class="keywords">requ</a>irements(<a href="http://code.js-code.com/tag/requ/" target="_blank" class="keywords">requ</a>irementsMode = AspNetCompatibility<a href="http://code.js-code.com/tag/requ/" target="_blank" class="keywords">requ</a>irementsMode.Allowed)] public class User<a href="http://code.js-code.com/tag/servi/" target="_blank" class="keywords">servi</a>ce <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> List<UserInfo> userList = new List<UserInfo> <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> new UserInfo <a href="http://code.js-code.com/tag/name/" target="_blank" class="keywords">{name</a> = "赵二",Address = "北京",Age = 2,IsMember = tru<a href="http://code.js-code.com/tag/E/" target="_blank" class="keywords">E}</a>,new UserInfo <a href="http://code.js-code.com/tag/name/" target="_blank" class="keywords">{name</a> = "<a href="http://code.js-code.com/tag/zhangsan/" target="_blank" class="keywords">张三</a>",Age = 3,IsMember = <a href="http://code.js-code.com/tag/fal/" target="_blank" class="keywords">fal</a>s<a href="http://code.js-code.com/tag/E/" target="_blank" class="keywords">E}</a>,new UserInfo <a href="http://code.js-code.com/tag/name/" target="_blank" class="keywords">{name</a> = "<a href="http://code.js-code.com/tag/lisi/" target="_blank" class="keywords">李四</a>",Age = 4,new UserInfo <a href="http://code.js-code.com/tag/name/" target="_blank" class="keywords">{name</a> = "<a href="http://code.js-code.com/tag/wangwu/" target="_blank" class="keywords">王五</a>",Age = 5,}; [OperationContract] [WebGet(ResponseFormat = Web<a href="http://code.js-code.com/tag/messageformat/" target="_blank" class="keywords">messageformat</a>.Json,UriTemplate = "DoWork")] public <a href="http://code.js-code.com/tag/Stri/" target="_blank" class="keywords">Stri</a>ng DoWork() <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> // Add your operation implementation here return "<a href="http://code.js-code.com/tag/Hel/" target="_blank" class="keywords">Hel</a>lo world"; } [OperationContract] [WebGet(ResponseFormat = Web<a href="http://code.js-code.com/tag/messageformat/" target="_blank" class="keywords">messageformat</a>.Json,UriTemplate = "GetUser")] public UserInfo GetUser() <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> return new UserInfo() <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> Name = "<a href="http://code.js-code.com/tag/zhangsan/" target="_blank" class="keywords">张三</a>",IsMember = true }; } [OperationContract] [WebGet(ResponseFormat = Web<a href="http://code.js-code.com/tag/messageformat/" target="_blank" class="keywords">messageformat</a>.Json,UriTemplate = "GetUserList")] public List<UserInfo> GetUserList() <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> return userList; } [OperationContract] [WebGet(ResponseFormat = Web<a href="http://code.js-code.com/tag/messageformat/" target="_blank" class="keywords">messageformat</a>.Json,UriTemplate = "GetUserListByAge/<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a>ag<a href="http://code.js-code.com/tag/E/" target="_blank" class="keywords">E}</a>")] public UserInfo GetUserListByAge(<a href="http://code.js-code.com/tag/Stri/" target="_blank" class="keywords">Stri</a>ng ag<a href="http://code.js-code.com/tag/E/" target="_blank" class="keywords">E)</a> <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> return (from u in userList where u.Age == int.Parse(ag<a href="http://code.js-code.com/tag/E/" target="_blank" class="keywords">E)</a> <a href="http://code.js-code.com/tag/SELE/" target="_blank" class="keywords">SELE</a>ct new UserInfo <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> Age = u.Age,Name = u.Name,IsMember = u.IsMember,Address = u.Address }).Sing<a href="http://code.js-code.com/tag/Leo/" target="_blank" class="keywords">Leo</a>rDefault(<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> } }

5.  Silverlight中要建立对应于DataContract的类。

public class UserInfo <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> public <a href="http://code.js-code.com/tag/Stri/" target="_blank" class="keywords">Stri</a>ng Name <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> get; set; } public <a href="http://code.js-code.com/tag/Stri/" target="_blank" class="keywords">Stri</a>ng Address <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> get; set; } public <a href="http://code.js-code.com/tag/inta/" target="_blank" class="keywords">int a</a>ge <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> get; set; } public bool IsMember <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> get; set; } }

6. 调用service,处理JSON

private void button1_Click(ob<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct sender,RoutedEventArgs <a href="http://code.js-code.com/tag/E/" target="_blank" class="keywords">E)</a> <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> Uri <a href="http://code.js-code.com/tag/servi/" target="_blank" class="keywords">servi</a>ceUri = new Uri("<a href="http://code.js-code.com/tag/http/" target="_blank" class="keywords">http</a>://localhost:2579/WCF<a href="http://code.js-code.com/tag/servi/" target="_blank" class="keywords">servi</a>ces/User<a href="http://code.js-code.com/tag/servi/" target="_blank" class="keywords">servi</a>ce.svc/GetUser"<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> WebClient webClient = new WebClient(<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> webClient<a href="http://code.js-code.com/tag/o/" target="_blank" class="keywords">.o</a>pen<a href="http://code.js-code.com/tag/ReadCo/" target="_blank" class="keywords">ReadCo</a>R_664_11845@pleted += <a href="http://code.js-code.com/tag/newope/" target="_blank" class="keywords">new ope</a>n<a href="http://code.js-code.com/tag/ReadCo/" target="_blank" class="keywords">ReadCo</a>R_664_11845@pletedEventHandler(webClient_Open<a href="http://code.js-code.com/tag/ReadCo/" target="_blank" class="keywords">ReadCo</a>R_664_11845@pleted<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> webClient<a href="http://code.js-code.com/tag/o/" target="_blank" class="keywords">.o</a>penReadAsync(<a href="http://code.js-code.com/tag/servi/" target="_blank" class="keywords">servi</a>ceUri<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> } void webClient_Open<a href="http://code.js-code.com/tag/ReadCo/" target="_blank" class="keywords">ReadCo</a>R_664_11845@pleted(ob<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct sender,Open<a href="http://code.js-code.com/tag/ReadCo/" target="_blank" class="keywords">ReadCo</a>R_664_11845@pletedEventArgs <a href="http://code.js-code.com/tag/E/" target="_blank" class="keywords">E)</a> <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> //声明<a href="http://code.js-code.com/tag/yige/" target="_blank" class="keywords">一个</a>UserInfo类型的DataContractJson<a href="http://code.js-code.com/tag/seria/" target="_blank" class="keywords">seria</a>lizer实例 DataContractJson<a href="http://code.js-code.com/tag/seria/" target="_blank" class="keywords">seria</a>lizer <a href="http://code.js-code.com/tag/seria/" target="_blank" class="keywords">seria</a>lizer = new DataContractJson<a href="http://code.js-code.com/tag/seria/" target="_blank" class="keywords">seria</a>lizer(typeof(UserInfo)<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> //<a href="http://code.js-code.com/tag/huoqu/" target="_blank" class="keywords">获取</a>JSON数据流的信息，并将它转换成为UserInfo实例 try <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> UserInfo userInfo = (UserInfo)<a href="http://code.js-code.com/tag/seria/" target="_blank" class="keywords">seria</a>lizer.ReadOb<a href="http://code.js-code.com/tag/je/" target="_blank" class="keywords">je</a>ct(e.Result<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a>//e.Result为JSON流数据 //下面<a href="http://code.js-code.com/tag/xianshi/" target="_blank" class="keywords">显示</a>userInfo中的数据信息 textBlock1.Text = <a href="http://code.js-code.com/tag/Stri/" target="_blank" class="keywords">Stri</a>ng.Format("Name:<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a>0},Address:<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a>1},Age:<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a><a href="http://code.js-code.com/tag/2/" target="_blank" class="keywords">2}</a>,IsMember:<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a>3} ",userInfo.Name,userInfo.Address,userInfo.Age,userInfo.IsMember<a href="http://code.js-code.com/tag/" target="_blank" class="keywords">);</a> } catch (Exception ex<a href="http://code.js-code.com/tag/p/" target="_blank" class="keywords">p)</a> <a href="http://code.js-code.com/tag/" target="_blank" class="keywords">{</a> <a href="http://code.js-code.com/tag/Stri/" target="_blank" class="keywords">Stri</a>ng a = exp.InnerException.<a href="http://code.js-code.com/tag/messa/" target="_blank" class="keywords">messa</a>ge; } }

注意，这里用到的DataContractJsonserializer类是在名空间using System.Runtime.serialization.Json， 程序集为：System.serviceModel.Web