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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

[索引页]
[源码下载]


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


作者: webabcd


介绍
Silverlight 2.0 调用REST服务,处理JSON格式,RSS/ATOM格式的数据
    通过 System.Net.WebClient 类调用 REST 服务
    通过 System.Json 命名控件下的类处理 JSON 数据
    通过 System.Xml.Linq 命名空间下的类(LINQ to XML)处理 XML 数据
    通过 System.ServiceModel.Syndication 命名空间下的类处理 RSS/ATOM 数据


在线DEMO
http://www.cnblogs.com/webabcd/archive/2008/10/09/1307486.html


示例
1、调用 REST 服务,返回 JSON 数据
REST.cs(WCF创建的REST服务)

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(1980214) };

    }


    
/// <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"11) },

            
new User(){ Name = "webabcd02"2) },

            
new User(){ Name = "webabcd03"33) },

        }
;

    }

}


Json.xaml

< 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 >


Json.xaml.cs

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},

                (
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

             
*/

        }

    }

}



2、调用 REST 服务,返回 XML 数据
REST.cs(WCF创建的REST服务)

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 XML(对象) 的 REST 服务

    
/// </summary>

    
/// <param name="name"></param>

    
/// <returns></returns>

    [OperationContract]

    [WebGet(UriTemplate 
= "User/{name}/xml", ResponseFormat = Webmessageformat.Xml)]

    
public User HelloXml(string name)

    
{

        
return new User { Name = name, 14) };

    }


    
/// <summary>

    
/// 用于演示返回 XML(集合) 的 REST 服务

    
/// </summary>

    
/// <returns></returns>

    [OperationContract]

    [WebGet(UriTemplate 
= "Users/xml", ResponseFormat = Webmessageformat.Xml)]

    
public List<User> HelloXml2()

    
{

        
return new List<User> 

        

            
new User(){ Name = "webabcd01",

            
new User(){ Name = "webabcd02",

            
new User(){ Name = "webabcd03",

        }
;

    }

}


Xml.xaml

< UserControl  x:Class ="Silverlight20.Communication.Xml"

    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 ="txtMsgXml"  Margin ="5"   />

        
< TextBox  x:Name ="txtMsgXml2"  Margin ="5"   />


    
</ StackPanel >

</ UserControl >


Xml.xaml.cs

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.Xml.Linq;

using  System.IO;


namespace  Silverlight20.Communication

{

    
public partial class Xml : UserControl

    
{

        
public Xml()

        
{

            InitializeComponent();


            
// 演示如何处理 XML(对象)

            XmlDemo();


            
// 演示如何处理 XML(集合)

            XmlDemo2();

        }


        
/// <summary>

        
/// 演示如何处理 XML(对象)

        
/// </summary>

        void XmlDemo()

        
{

            
// REST 服务的 URL

            Uri uri = new Uri("http://localhost:3036/REST.svc/User/webabcd/xml", UriKind.Absolute);


            
// 实例化 WebClient

            System.Net.WebClient client = new System.Net.WebClient();


            client.DownloadStringCompleted 
+= new DownloadStringCompletedEventHandler(xml_DownloadStringCompleted);

            client.DownloadStringAsync(uri);


            txtMsgXml.Text 
= "读取 XML(对象) 数据中。。。";

        }


        
void xml_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)

        
{

            
if (e.Error != null)

            
{

                
// 发生错误的话,则打印出来

                txtMsgXml.Text = e.Error.ToString();

                
return;

            }


            
// 将获得的字符串转换为 XML(对象)

            var buffer = System.Text.Encoding.UTF8.GetBytes(e.Result);

            var ms 
= new MemoryStream(buffer);


            XElement xmlObject 
= XElement.Load(ms);


            txtMsgXml.Text 
= e.Result + "/r/n";

            XNamespace ns 
= "http://webabcd.cnblogs.com/";

            txtMsgXml.Text 
+= string.Format("姓名: {0},

                (
string)xmlObject.Element(ns + "Name"),

                ((DateTime)xmlObject.Element(ns 
+ "DayOfBirth")).ToString("yyyy-MM-dd"));


            
/* 

             * 总结:

             * XElement - 表示一个 XML 元素

             *     XElement.Element - XML 元素内的 XML 元素

             *     XElement.Attribute - XML 元素内的 XML 属性

             *     XElement.Load(Stream) - 使用指定流创建一个 XElement 对象

             *     XElement.Parse(String) - 解析指定的 XML 字符串为一个 XElement 对象

             * XAttribute - 表示一个 XML 属性

             
*/

        }


        
/// <summary>

        
/// 演示如何处理 XML(集合)

        
/// </summary>

        void XmlDemo2()

        
{

            
// REST 服务的 URL

            Uri uri = new Uri("http://localhost:3036/REST.svc/Users/xml", UriKind.Absolute);


            
// 实例化 WebClient

            System.Net.WebClient client = new System.Net.WebClient();


            client.DownloadStringCompleted 
+= new DownloadStringCompletedEventHandler(xml2_DownloadStringCompleted);

            client.DownloadStringAsync(uri);


            txtMsgXml2.Text 
= "读取 XML(集合) 数据中。。。";

        }


        
void xml2_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)

        
{

            
if (e.Error != null)

            
{

                
// 发生错误的话,则打印出来

                txtMsgXml2.Text = e.Error.ToString();

                
return;

            }


            
// 将获得的字符串转换为 XML(集合)

            XDocument xmlObject = XDocument.Parse(e.Result);


            txtMsgXml2.Text 
= e.Result + "/r/n";

            XNamespace ns 
= "http://webabcd.cnblogs.com/";

            var obj 
= from p in xmlObject.Elements(ns + "ArrayOfUser").Elements(ns + "User")

                      
where p.Element(ns + "Name").Value == "webabcd02"

                      select 
new { Name = (string)p.Element(ns + "Name"), DayOfBirth = (DateTime)p.Element(ns + "DayOfBirth") };

            

            txtMsgXml2.Text 
+= string.Format("姓名: {0},

                obj.First().Name,

                obj.First().DayOfBirth.ToString(
"yyyy-MM-dd"));



            
/* 

             * 总结:

             * LINQ to XML 相当的方便

             
*/

        }

    }

}



3、调用 REST 服务,返回 RSS/Atom 数据
Proxy.aspx.cs(返回指定的URL地址内容的服务)

using  System;

using  System.Collections.Generic;

using  System.Linq;

using  System.Web;

using  System.Web.UI;

using  System.Web.UI.WebControls;


public   partial   class  Proxy : System.Web.UI.Page

{

    
protected void Page_Load(object sender, EventArgs e)

    
{

        
// 获取某个 url 地址的 html 并在页面输出


        
string url = Request.QueryString["url"];


        System.Net.WebClient client 
= new System.Net.WebClient();

        client.Encoding 
= System.Text.Encoding.UTF8;


        Response.Write(client.DownloadString(url));

        Response.End();

    }

}


RSSAtom.xaml

< UserControl  x:Class ="Silverlight20.Communication.RSSAtom"

    xmlns
="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  

    xmlns:x
="http://schemas.microsoft.com/winfx/2006/xaml" >

    
< StackPanel  HorizontalAlignment ="Left"   >


        
< TextBox  x:Name ="txtMsgRSS"  Width ="600"  Margin ="5"   />


        
< StackPanel  Orientation ="Horizontal" >

        

            
< ListBox  x:Name ="list"  Width ="300"  Margin ="5"  SelectionChanged ="list_SelectionChanged" >

                
< ListBox.ItemTemplate >

                    
< DataTemplate >

                        
< TextBlock  Text =" {Binding Title.Text} " ></ TextBlock >

                    
</ DataTemplate >

                
</ ListBox.ItemTemplate >

            
</ ListBox >


            
< TextBlock  x:Name ="detail"  Width ="300"  Margin ="5"  Text =" {Binding Summary.Text} "  textwrapping ="Wrap"   />

            

        
</ StackPanel >

        

    
</ StackPanel >

</ UserControl >


RSSAtom.xaml.cs

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.Xml;

using  System.IO;

using  System.ServiceModel.Syndication;


namespace  Silverlight20.Communication

{

    
public partial class RSSAtom : UserControl

    
{

        
public RSSAtom()

        
{

            InitializeComponent();


            
// 演示如何处理 RSS/Atom

            RSSDemo();

        }


        
/// <summary>

        
/// 演示如何处理 RSS/Atom

        
/// </summary>

        void RSSDemo()

        
{

            
// 让一个代理页面去请求相关的 RSS/Atom(如果用Silverlight直接去请求,则需要在目标域的根目录下配置策略文件

            Uri uri = new Uri("http://localhost:3036/Proxy.aspx?url=http://webabcd.cnblogs.com/RSS", UriKind.Absolute);


            
// 实例化 WebClient

            System.Net.WebClient client = new System.Net.WebClient();


            client.DownloadStringCompleted 
+= new DownloadStringCompletedEventHandler(RSS_DownloadStringCompleted);

            client.DownloadStringAsync(uri);


            txtMsgRSS.Text 
= "读取 RSS 数据中。。。";

        }


        
void RSS_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)

        
{

            
if (e.Error != null)

            
{

                
// 发生错误的话,则打印出来

                txtMsgRSS.Text = e.Error.ToString();

                
return;

            }


            
// 将获得的字符串转换为 XmlReader

            var buffer = System.Text.Encoding.UTF8.GetBytes(e.Result);

            var ms 
= new MemoryStream(buffer);

            XmlReader reader 
= XmlReader.Create(ms);


            
// 从指定的 XmlReader 中加载,以生成 SyndicationFeed

            SyndicationFeed Feed = SyndicationFeed.Load(reader);


            
// 设置 list 的数据源为 RSS/Atom 的项集合(SyndicationFeed.Items)

            list.ItemsSource = Feed.Items;

            txtMsgRSS.Text 
= e.Result + "/r/n";

        }


        
private void list_SelectionChanged(object sender, SelectionChangedEventArgs e)

        
{

            
// 设置 detail 的数据上下文为 RSS/Atom 的指定项(SyndicationItem)

            detail.DataContext = list.SelectedItem as SyndicationItem;

        }

    }

}



OK
[源码下载]

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