<UserControl x:Class="HCLoad.UC_UpDown"  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   Width="500" Height="500">  <StackPanel Background="White" Height="450">    <Button Content="down" Click="Button_Click"></Button>    <HyperlinkButton Content="下載保存" NavigateUri="http://localhost:4528/download.ashx?fileName=aa.txt" TargetName="_self" x:Name="lBtnDown" />    <TextBlock x:Name="tbMsgString" Text="下載進度" TextAlignment="Center" Foreground="Green"></TextBlock>    <Button x:Name="btnDownload" Content="DownLoad Pictures" Width="150" Height="35" Margin="15" Click="btnDownload_Click"/>    <Border Background="Wheat" BorderThickness="5" Width="400" Height="280">      <Image x:Name="imgDownLoad" Width="400" Height="300" Margin="15" Stretch="Fill"/>    </Border>    <Button x:Name="btnUpLoad" Content="UpLoad Pictures" Width="150" Height="35" Margin="15" Click="btnUpLoad_Click"/>  </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.Windows.Media.Imaging; //因為要使用BitmapImageusing System.IO; //因為要使用Streamnamespace HCLoad{  public partial class UC_UpDown : UserControl  {    //1、WebClient 對象一次只能啟動一個請求。如果在一個請求完成（包括出錯和取消）前，即IsBusy為true時，進行第二個請求，則第二個請求將會拋出 NotSupportedException 類型的異常    //2、如果 WebClient 對象的 BaseAddress 屬性不為空，則 BaseAddress 與 URI（相對地址） 組合在一起構成絕對 URI    //3、WebClient 類的 AllowReadStreamBuffering 屬性：是否對從 Internet 資源接收的數據做緩沖處理。默認值為true，將數據緩存在客戶端內存中，以便隨時被應用程序讀取    //獲取選定圖片信息    System.IO.FileInfo fileinfo;    public UC_UpDown()    {      InitializeComponent();    }    #region 下載圖片    private void btnDownload_Click(object sender, RoutedEventArgs e)    {      //向指定的Url發送下載流數據請求       String imgUrl = "http://localhost:4528/Bubble.jpg";      Uri endpoint = new Uri(imgUrl);      WebClient client = new WebClient();      client.OpenReadCompleted += new OpenReadCompletedEventHandler(OnOpenReadCompleted);      client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(clientDownloadStream_DownloadProgressChanged);      client.OpenReadAsync(endpoint);    }    void OnOpenReadCompleted(object sender, OpenReadCompletedEventArgs e)    {      //OpenReadCompletedEventArgs.Error - 該異步操作期間是否發生了錯誤      //OpenReadCompletedEventArgs.Cancelled - 該異步操作是否已被取消      //OpenReadCompletedEventArgs.Result - 下載后的 Stream 類型的數據      //OpenReadCompletedEventArgs.UserState - 用戶標識      if (e.Error != null)      {        MessageBox.Show(e.Error.ToString());        return;      }      if (e.Cancelled != true)      {        //獲取下載的流數據(在此處是圖片數據)并顯示在圖片控件中        //Stream stream = e.Result;        //BitmapImage bitmap = new BitmapImage();        //bitmap.SetSource(stream);        //imgDownLoad.Source = bitmap;        Stream clientStream = e.UserState as Stream;        Stream serverStream = (Stream)e.Result;        byte[] buffer = new byte[serverStream.Length];        serverStream.Read(buffer, 0, buffer.Length);        clientStream.Write(buffer, 0, buffer.Length);        clientStream.Close();        serverStream.Close();      }    }    void clientDownloadStream_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)    {      //DownloadProgressChangedEventArgs.ProgressPercentage - 下載完成的百分比      //DownloadProgressChangedEventArgs.BytesReceived - 當前收到的字節數      //DownloadProgressChangedEventArgs.TotalBytesToReceive - 總共需要下載的字節數      //DownloadProgressChangedEventArgs.UserState - 用戶標識      this.tbMsgString.Text = string.Format("完成百分比：{0} 當前收到的字節數：{1} 資料大?。簕2} ",       e.ProgressPercentage.ToString() + "%",       e.BytesReceived.ToString(),       e.TotalBytesToReceive.ToString());    }    #endregion    #region 上傳圖片    private void btnUpLoad_Click(object sender, RoutedEventArgs e)    {      /**/      /*     *　　 OpenWriteCompleted - 在打開用于上傳的流完成時（包括取消操作及有錯誤發生時）所觸發的事件     *　　 WriteStreamClosed - 在寫入數據流的異步操作完成時（包括取消操作及有錯誤發生時）所觸發的事件     *　　 UploadProgressChanged - 上傳數據過程中所觸發的事件。如果調用 OpenWriteAsync() 則不會觸發此事件     *　　 Headers - 與請求相關的的標頭的 key/value 對**     *　　 OpenWriteAsync(Uri address, string method, Object userToken) - 打開流以使用指定的方法向指定的 URI 寫入數據     *　　　　 Uri address - 接收上傳數據的 URI     *　　　　 string method - 所使用的 HTTP 方法（POST 或 GET）     *　　　　 Object userToken - 需要上傳的數據流     */      OpenFileDialog openFileDialog = new OpenFileDialog()      { //彈出打開文件對話框要求用戶自己選擇在本地端打開的圖片文件        Filter = "Jpeg Files (*.jpg)|*.jpg|All Files(*.*)|*.*",        Multiselect = false //不允許多選       };      if (openFileDialog.ShowDialog() == true)//.DialogResult.OK)      {        //fileinfo = openFileDialog.Files; //取得所選擇的文件，其中Name為文件名字段，作為綁定字段顯示在前端        fileinfo = openFileDialog.File;        if (fileinfo != null)        {          WebClient webclient = new WebClient();          string uploadFileName = fileinfo.Name.ToString(); //獲取所選文件的名字          #region 把圖片上傳到服務器上          Uri upTargetUri = new Uri(String.Format("http://localhost:4528/WebClientUpLoadStreamHandler.ashx?fileName={0}", uploadFileName), UriKind.Absolute); //指定上傳地址          webclient.OpenWriteCompleted += new OpenWriteCompletedEventHandler(webclient_OpenWriteCompleted);          webclient.Headers["Content-Type"] = "multipart/form-data";          webclient.OpenWriteAsync(upTargetUri, "POST", fileinfo.OpenRead());          webclient.WriteStreamClosed += new WriteStreamClosedEventHandler(webclient_WriteStreamClosed);          #endregion        }        else        {          MessageBox.Show("請選取想要上載的圖片!!!");        }      }    }    void webclient_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e)    {      //將圖片數據流發送到服務器上      // e.UserState - 需要上傳的流（客戶端流）      Stream clientStream = e.UserState as Stream;      // e.Result - 目標地址的流（服務端流）      Stream serverStream = e.Result;      byte[] buffer = new byte[4096];      int readcount = 0;      // clientStream.Read - 將需要上傳的流讀取到指定的字節數組中      while ((readcount = clientStream.Read(buffer, 0, buffer.Length)) > 0)      {        // serverStream.Write - 將指定的字節數組寫入到目標地址的流        serverStream.Write(buffer, 0, readcount);      }      serverStream.Close();      clientStream.Close();    }    void webclient_WriteStreamClosed(object sender, WriteStreamClosedEventArgs e)    {      //判斷寫入是否有異常      if (e.Error != null)      {        System.Windows.Browser.HtmlPage.Window.Alert(e.Error.Message.ToString());      }      else      {        System.Windows.Browser.HtmlPage.Window.Alert("圖片上傳成功!!!");      }    }    #endregion    private void Button_Click(object sender, RoutedEventArgs e)    {      //這種方法搞不定，好像提示跨域操作。      //提示：錯誤：Unhandled Error in Silverlight Application 跨線程訪問無效。      //Uri upTargetUri = new Uri(String.Format("http://localhost:4528/download.ashx?filename={0}", "123.jpg"), UriKind.Absolute); //指定上傳地址      //WebRequest request = WebRequest.Create(upTargetUri);      //request.Method = "GET";      //request.ContentType = "application/octet-stream";      //request.BeginGetResponse(new AsyncCallback(RequestReady), request);      //通過調用js代碼下載，比較簡單。      System.Windows.Browser.HtmlPage.Window.Eval("window.location.href='http://localhost:4528/download.ashx?filename=123.jpg';");    }    void RequestReady(IAsyncResult asyncResult)    {      MessageBox.Show("RequestComplete");    }  }}

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.IO; //因為要用到Streamnamespace HCLoad.Web{  public class WebClientUpLoadStreamHandler : IHttpHandler  {    public void ProcessRequest(HttpContext context)    {      //獲取上傳的數據流      string fileNameStr = context.Request.QueryString["fileName"];      Stream sr = context.Request.InputStream;      try      {        string filename = "";        filename = fileNameStr;        byte[] buffer = new byte[4096];        int bytesRead = 0;        //將當前數據流寫入服務器端文件夾ClientBin下        string targetPath = context.Server.MapPath("Pics/" + filename + ".jpg");        using (FileStream fs = File.Create(targetPath, 4096))        {          while ((bytesRead = sr.Read(buffer, 0, buffer.Length)) > 0)          {            //向文件中寫信息            fs.Write(buffer, 0, bytesRead);          }        }        context.Response.ContentType = "text/plain";        context.Response.Write("上傳成功");      }      catch (Exception e)      {        context.Response.ContentType = "text/plain";        context.Response.Write("上傳失敗, 錯誤信息:" + e.Message);      }      finally      { sr.Dispose(); }    }    public bool IsReusable    {      get      {        return false;      }    }  }}

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Services;using System.Net;namespace HCLoad.Web{  /// <summary>  /// $codebehindclassname$ 的摘要說明  /// </summary>  public class download : IHttpHandler  {    private long ChunkSize = 102400;//100K 每次讀取文件，只讀取100Ｋ，這樣可以緩解服務器的壓力    public void ProcessRequest(HttpContext context)    {      //string fileName = "123.jpg";//客戶端保存的文件名      String fileName = context.Request.QueryString["filename"];       string filePath = context.Server.MapPath("Bubble.jpg");      System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);      if (fileInfo.Exists == true)      {        byte[] buffer = new byte[ChunkSize];        context.Response.Clear();        System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);        long dataLengthToRead = iStream.Length;//獲得下載文件的總大小        context.Response.ContentType = "application/octet-stream";        //通知瀏覽器下載文件而不是打開        context.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));        while (dataLengthToRead > 0 && context.Response.IsClientConnected)        {          int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//讀取的大小          context.Response.OutputStream.Write(buffer, 0, lengthRead);          context.Response.Flush();          dataLengthToRead = dataLengthToRead - lengthRead;        }        context.Response.Close();        context.Response.End();      }      //context.Response.ContentType = "text/plain";      //context.Response.Write("Hello World");    }    public bool IsReusable    {      get      {        return false;      }    }  }}