search了非常多的文章，總算勉強實現了。有許多不完善的地方。
在HCLoad.Web項目下新建目錄Pics復制一張圖片到根目錄下。
圖片名：Bubble.jpg 右擊->屬性->生成操作：Resource
UC_UpDown.xaml
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<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> |
UC_UpDown.xaml.cs
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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} 資料大小：{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"); } }} |
在HCLoad.Web項目下新建WebClientUpLoadStreamHandler.ashx
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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; } } }} |
新建download.ashx
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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; } } }} |
參考：
http://www.cnblogs.com/wsdj-ittech/archive/2009/08/26/1554056.html
http://www.cnblogs.com/wsdj-ittech/archive/2009/08/25/1553534.html
http://www.cnblogs.com/wmt1708/archive/2009/03/07/1405009.html
http://topic.csdn.net/u/20090918/10/5e41ab52-f514-46b5-ae6a-d69ddb197213.html
http://www.cnblogs.com/wsdj-ittech/archive/2009/08/25/1553534.html
http://www.cnblogs.com/gwazy/archive/2009/04/02/1427781.html
http://www.cnblogs.com/ewyb/archive/2009/12/10/1621020.html
http://blog.csdn.net/emily1900/archive/2010/06/08/5655726.aspx
