稳扎稳打Silverlight(19) - 2.0通信之调用REST服务，处理JSON格式, XML格式, RSS/ATOM格式的数据

using System; 
using System.Linq; 
using System.Runtime.Serialization; 
using System.ServiceModel; 
using System.ServiceModel.Activation; 
 
using System.ServiceModel.Web; 
using System.Collections.Generic; 
using System.Text; 
using System.IO; 
 
/// <summary> 
/// 提供 REST 服务的类 
/// 注：Silverlight只支持 GET 和 POST 
/// </summary> 
[ServiceContract] 
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] 
public  class REST 
{ 
         /// <summary> 
         /// 用于演示返回 JSON（对象） 的 REST 服务 
         /// </summary> 
         /// <param name="name"></param> 
         /// <returns></returns> 
        [OperationContract] 
        [WebGet(UriTemplate =  "User/{name}/json", ResponseFormat = WebMessageFormat.Json)] 
         public User HelloJson( string name) 
        { 
                 return  new User { Name = name, DayOfBirth =  new DateTime(1980, 2, 14) }; 
        } 
 
         /// <summary> 
         /// 用于演示返回 JSON（集合） 的 REST 服务 
         /// </summary> 
         /// <returns></returns> 
        [OperationContract] 
        [WebGet(UriTemplate =  "Users/json", ResponseFormat = WebMessageFormat.Json)] 
         public List<User> HelloJson2() 
        { 
                 return  new List<User>    
                {    
                         new User(){ Name =  "webabcd01", DayOfBirth =  new DateTime(1980, 1, 1) }, 
                         new User(){ Name =  "webabcd02", DayOfBirth =  new DateTime(1980, 2, 2) }, 
                         new User(){ Name =  "webabcd03", DayOfBirth =  new DateTime(1980, 3, 3) }, 
                }; 
        } 
}

<UserControl x:Class="Silverlight20.Communication.Json" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> 
        <StackPanel HorizontalAlignment="Left" Width="600"> 
         
                <TextBox x:Name="txtMsgJson" Margin="5" /> 
                <TextBox x:Name="txtMsgJson2" Margin="5" />    
                 
        </StackPanel> 
</UserControl>

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Net; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Documents; 
using System.Windows.Input; 
using System.Windows.Media; 
using System.Windows.Media.Animation; 
using System.Windows.Shapes; 
 
using System.IO; 
 
namespace Silverlight20.Communication 
{ 
         public partial  class Json : UserControl 
        { 
                 public Json() 
                { 
                        InitializeComponent(); 
 
                         // 演示如何处理 JSON（对象） 
                        JsonDemo(); 
 
                         // 演示如何处理 JSON（集合） 
                        JsonDemo2(); 
                } 
 
                 /// <summary> 
                 /// 演示如何处理 JSON（对象） 
                 /// </summary> 
                 void JsonDemo() 
                { 
                         // REST 服务的 URL 
                        Uri uri =  new Uri( "http://localhost:3036/REST.svc/User/webabcd/json", UriKind.Absolute); 
 
                        // 实例化 WebClient 
                        System.Net.WebClient client = new System.Net.WebClient(); 
 
                        client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(json_DownloadStringCompleted); 
                        client.DownloadStringAsync(uri); 
 
                        txtMsgJson.Text = "读取 JSON（对象） 数据中。。。"; 
                } 
 
                void json_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) 
                { 
                        if (e.Error != null) 
                        { 
                                // 发生错误的话，则打印出来 
                                txtMsgJson.Text = e.Error.ToString(); 
                                return; 
                        } 
 
                        // 将获得的字符串转换为 JSON（对象） 
                        var buffer = System.Text.Encoding.UTF8.GetBytes(e.Result); 
                        var ms = new MemoryStream(buffer); 
                        var jsonObject = System.Json.JsonObject.Load(ms) as System.Json.JsonObject; 
 
                        txtMsgJson.Text = e.Result + "\r\n"; 
                        // 解析 JSON（对象） 
                        txtMsgJson.Text += string.Format("姓名: {0}, 生日: {1}", 
                                (string)jsonObject["Name"], 
                                ((DateTime)jsonObject["DayOfBirth"]).ToString("yyyy-MM-dd")); 
 
                        /*    
                         * 总结： 
                         * JsonObject - 一个具有零或多个 key-value 对的无序集合。继承自抽象类 JsonValue 
                         *         JsonObject.Load(Stream) - 将指定的字符串流反序列化为 JSON 对象（CLR可用的类型） 
                         *         JsonObject[key] - JsonObject 索引器，获取 JsonObject 的指定key的value 
                         *         JsonObject.ContainsKey(key) - JsonObject 对象内是否具有指定的key 
                         */ 
                } 
 
                /// <summary> 
                /// 演示如何处理 JSON（集合） 
                /// </summary> 
                void JsonDemo2() 
                { 
                        // REST 服务的 URL 
                        Uri uri = new Uri("http://localhost:3036/REST.svc/Users/json", UriKind.Absolute); 
 
                        // 实例化 WebClient 
                        System.Net.WebClient client = new System.Net.WebClient(); 
 
                        client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(json2_DownloadStringCompleted); 
                        client.DownloadStringAsync(uri); 
 
                        txtMsgJson2.Text = "读取 JSON（集合） 数据中。。。"; 
                } 
 
                void json2_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) 
                { 
                        if (e.Error != null) 
                        { 
                                // 发生错误的话，则打印出来 
                                txtMsgJson2.Text = e.Error.ToString(); 
                                return; 
                        } 
 
                        // 将获得的字符串转换为 JSON（集合） 
                        var buffer = System.Text.Encoding.UTF8.GetBytes(e.Result); 
                        var ms = new MemoryStream(buffer); 
                        var jsonArray = System.Json.JsonArray.Load(ms) as System.Json.JsonArray; 
 
                        txtMsgJson2.Text = e.Result + "\r\n"; 
                        txtMsgJson2.Text += string.Format("姓名: {0}, 生日: {1}", 
                                (string)jsonArray.First()["Name"], 
                                ((DateTime)jsonArray.Single(p => p["Name"] == "webabcd02")["DayOfBirth"]).ToString("yyyy-MM-dd")); 
 
                        /*    
                         * 总结： 
                         * JsonArray - 一个具有零或多个 JsonValue（抽象类，JsonObject和JsonArray都继承自此类） 对象的有序序列 
                         *         JsonArray.Load(Stream) - 将指定的字符串流反序列化为 JSON 对象（CLR可用的类型） 
                         *         JsonArray[index] - JsonArray 索引器，获取 JsonArray 的指定索引的 JsonValue 
                         *         JsonArray 支持 LINQ 
                         */ 
                } 
        } 
}