1 namespace SLAwb.Helper 2 { 3     public sealed class MediaType 4     { 5         /// <summary> 6         /// "application/xml" 7         /// </summary> 8         public const string APPLICATION_XML = "application/xml"; 9 10         /// <summary>11         /// application/json12         /// </summary>13         public const string APPLICATION_JSON = "application/json";14 15         /// <summary>16         /// "application/x-www-form-urlencoded"17         /// </summary>18         public const string APPLICATION_FORM_URLENCODED = "application/x-www-form-urlencoded";19      20     }21 }

 1 using System; 2 using System.IO; 3 using System.Net; 4 using System.Threading; 5  6 namespace SLAwb.Helper 7 { 8     /// <summary> 9     /// Http工具类，用于向指定url发起Get或Post请求10     /// http://yjmyzz.cnblogs.com/11     /// </summary>12     public class HttpHelper13     {14         private string postData;15         SynchronizationContext currentContext;16         SendOrPostCallback sendOrPostCallback;17 18         /// <summary>19         /// 从指定url以Get方式获取数据20         /// </summary>21         /// <param name="url"></param>22         /// <param name="completedHandler"></param>23         public void Get(string url, DownloadStringCompletedEventHandler completedHandler)24         {25             WebClient client = new WebClient();26             client.DownloadStringCompleted += completedHandler;27             client.DownloadStringAsync(new Uri(url));28         }29 30 31 32         /// <summary>33         /// 向指定url地址Post数据34         /// </summary>35         /// <param name="url"></param>36         /// <param name="data"></param>37         /// <param name="mediaType"></param>38         /// <param name="synchronizationContext"></param>39         /// <param name="callBack"></param>40         public void Post(string url, string data, string mediaType, SynchronizationContext synchronizationContext, SendOrPostCallback callBack)41         {42             currentContext = synchronizationContext;43             Uri endpoint = new Uri(url);44             sendOrPostCallback = callBack;45             HttpWebRequest request = (HttpWebRequest)WebRequest.Create(endpoint);46             request.Method = "POST";47             request.ContentType = mediaType;48             postData =http://www.mamicode.com/ data;49             request.BeginGetRequestStream(new AsyncCallback(RequestReadySocket), request);50         }51 52         private void RequestReadySocket(IAsyncResult asyncResult)53         {54             WebRequest request = asyncResult.AsyncState as WebRequest;55             Stream requestStream = request.EndGetRequestStream(asyncResult);56 57             using (StreamWriter writer = new StreamWriter(requestStream))58             {59                 writer.Write(postData);60                 writer.Flush();61             }62 63             request.BeginGetResponse(new AsyncCallback(ResponseReadySocket), request);64         }65 66         private void ResponseReadySocket(IAsyncResult asyncResult)67         {68             try69             {70                 WebRequest request = asyncResult.AsyncState as WebRequest;71                 WebResponse response = request.EndGetResponse(asyncResult);72                 using (Stream responseStream = response.GetResponseStream())73                 {74                     StreamReader reader = new StreamReader(responseStream);75                     string paramStr = reader.ReadToEnd();76                     currentContext.Post(sendOrPostCallback, paramStr);77                 }78             }79             catch (Exception e)80             {81                 currentContext.Post(sendOrPostCallback, e.Message); 82             }83             84         }85 86 87     }88 }

 1 <UserControl x:Class="SLAwb.MainPage" 2     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 3     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 4     xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 5     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 6     mc:Ignorable="d" 7     d:DesignHeight="480" d:DesignWidth="640"> 8  9     <Grid x:Name="LayoutRoot" Background="White">10         <Grid.RowDefinitions>11             <RowDefinition Height="30"></RowDefinition>12             <RowDefinition Height="*"></RowDefinition>13             <RowDefinition Height="2*"></RowDefinition>14         </Grid.RowDefinitions>        15         <Grid Grid.Row="0" Margin="3">16             <Grid.ColumnDefinitions>17                 <ColumnDefinition Width="40"></ColumnDefinition>18                 <ColumnDefinition Width="*"></ColumnDefinition>19                 <ColumnDefinition Width="75"></ColumnDefinition>20                 <ColumnDefinition Width="95"></ColumnDefinition>21                 <ColumnDefinition Width="80"></ColumnDefinition>22                 <ColumnDefinition Width="80"></ColumnDefinition>23             </Grid.ColumnDefinitions>24             <TextBlock VerticalAlignment="Center" TextAlignment="Right">地址：</TextBlock>25             <TextBox Name="txtUrl" Grid.Column="1" Text="http://localhost/"></TextBox>26             <TextBlock Grid.Column="2" VerticalAlignment="Center" TextAlignment="Right">MediaType：</TextBlock>27             <TextBox Name="txtMediaType" Grid.Column="3" Text="application/xml"></TextBox>28             <Button Name="btnPost" Content="Post" Grid.Column="4" Margin="3,1" Click="btnPost_Click"></Button>29             <Button Name="btnGet" Content="Get" Grid.Column="5" Margin="3,1" Click="btnGet_Click"></Button>30         </Grid>31         32         <Grid Grid.Row="1">33             <Grid.ColumnDefinitions>34                 <ColumnDefinition Width="40"></ColumnDefinition>35                 <ColumnDefinition Width="*"></ColumnDefinition>36             </Grid.ColumnDefinitions>37             <TextBlock VerticalAlignment="Top" TextAlignment="Right">数据：</TextBlock>38             <TextBox Name="txtPostData" Grid.Column="1" Margin="3" AcceptsReturn="True" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto"></TextBox>39         </Grid>40 41         <Grid Grid.Row="2">42             <Grid.ColumnDefinitions>43                 <ColumnDefinition Width="40"></ColumnDefinition>44                 <ColumnDefinition Width="*"></ColumnDefinition>45             </Grid.ColumnDefinitions>46             <TextBlock VerticalAlignment="Top" TextAlignment="Right">返回：</TextBlock>47             <TextBox Name="txtResult" Grid.Column="1" Margin="3" AcceptsReturn="True" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto"></TextBox>48         </Grid>49     </Grid>50 </UserControl>

 1 using SLAwb.Helper; 2 using System; 3 using System.Net; 4 using System.Threading; 5 using System.Windows; 6 using System.Windows.Controls; 7  8 namespace SLAwb 9 {10     public partial class MainPage : UserControl11     {12         private SynchronizationContext currentContext;13 14 15         public MainPage()16         {17             InitializeComponent();18             this.currentContext = SynchronizationContext.Current;19         }20 21         private void btnPost_Click(object sender, RoutedEventArgs e)22         {23             BeforeReturn();24             HttpHelper httpHelper = new HttpHelper();25             httpHelper.Post(txtUrl.Text, txtPostData.Text, txtMediaType.Text, currentContext, PostCompletedHandler);26         }27 28         private void PostCompletedHandler(Object obj)29         {30             txtResult.Text = obj.ToString();31         }32 33         private void btnGet_Click(object sender, RoutedEventArgs e)34         {35             BeforeReturn();36             HttpHelper httpHelper = new HttpHelper();37             httpHelper.Get(txtUrl.Text, GetCompletedHandler);            38         }39 40 41         void BeforeReturn() {42             txtResult.Text = "loading...";43         }44 45 46         void GetCompletedHandler(object sender, DownloadStringCompletedEventArgs e)47         {48             if (e.Error == null)49             {50                 txtResult.Text = e.Result;51             }52             else53             {54                 txtResult.Text = e.Error.Message;55             }56         }57     }58 }