Silverlight中使用Json

概述1. 建立AjaxEnabled-WCF service。 <%@ ServiceHost Language="C#" Debug="true" Service="JsonTest.Web.WCFServices.UserService" CodeBehind="UserService.svc.cs" Factory="System.ServiceModel.Activation.WebServi

1. 建立AJAXEnabled-WCF service。

<%@ ServiceHost Language="C#" DeBUG="true" Service="JsonTest.Web.WCFServices.UserService" CodeBehind="UserService.svc.cs" Factory="System.ServiceModel.Activation.WebServiceHostFactory" %>

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.WCFServices.UserServiceAspNetAJAXBehavior"> <!--<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 { [DataMember] public string name { get; set; } [DataMember] public string Address { get; set; } [DataMember] public int Age { get; set; } [DataMember] public bool IsMember { get; set; } }

 

4. WCF Service 代码：

[ServiceContract(namespace = "")] [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] public class UserService { List<UserInfo> userList = new List<UserInfo> { new UserInfo {name = "赵二",Address = "北京",Age = 2,IsMember = true},new UserInfo {name = "张三",Age = 3,IsMember = false},new UserInfo {name = "李四",Age = 4,new UserInfo {name = "王五",Age = 5,}; [OperationContract] [WebGet(ResponseFormat = Webmessageformat.Json,UriTemplate = "DoWork")] public string DoWork() { // Add your operation implementation here return "Hello world"; } [OperationContract] [WebGet(ResponseFormat = Webmessageformat.Json,UriTemplate = "GetUser")] public UserInfo GetUser() { return new UserInfo() { name = "张三",IsMember = true }; } [OperationContract] [WebGet(ResponseFormat = Webmessageformat.Json,UriTemplate = "GetUserList")] public List<UserInfo> GetUserList() { return userList; } [OperationContract] [WebGet(ResponseFormat = Webmessageformat.Json,UriTemplate = "GetUserListByAge/{age}")] public UserInfo GetUserListByAge(string age) { return (from u in userList where u.Age == int.Parse(age) select new UserInfo { Age = u.Age,name = u.name,IsMember = u.IsMember,Address = u.Address }).SingleOrDefault(); } }

 

5.  Silverlight中要建立对应于DataContract的类。

public class UserInfo { public string name { get; set; } public string Address { get; set; } public int Age { get; set; } public bool IsMember { get; set; } }

 

6. 调用Service,处理JsON

private voID button1_Click(object sender,RoutedEventArgs e) { Uri serviceUri = new Uri("http://localhost:2579/WCFServices/UserService.svc/GetUser"); WebClIEnt webClIEnt = new WebClIEnt(); webClIEnt.OpenReadCompleted += new OpenReadCompletedEventHandler(webClIEnt_OpenReadCompleted); webClIEnt.OpenReadAsync(serviceUri); } voID webClIEnt_OpenReadCompleted(object sender,OpenReadCompletedEventArgs e) { //声明一个UserInfo类型的DataContractJsonSerializer实例 DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(UserInfo)); //获取JsON数据流的信息，并将它转换成为UserInfo实例 try { UserInfo userInfo = (UserInfo)serializer.Readobject(e.Result);//e.Result为JsON流数据 //下面显示userInfo中的数据信息 textBlock1.Text = string.Format("name:{0},Address:{1},Age:{2},IsMember:{3} ",userInfo.name,userInfo.Address,userInfo.Age,userInfo.IsMember); } catch (Exception exp) { string a = exp.InnerException.Message; } }

 

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

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