Silverlight文件上傳下載完成辦法(下載保留)。本站提示廣大學習愛好者：（Silverlight文件上傳下載完成辦法(下載保留)）文章只能為提供參考，不一定能成為您想要的結果。以下是Silverlight文件上傳下載完成辦法(下載保留)正文
search了異常多的文章，總算委曲完成了。有很多不完美的處所。
在HCLoad.Web項面前目今新建目次Pics復制一張圖片到根目次下。
圖片名：Bubble.jpg 右擊->屬性->生成操作：Resource
UC_UpDown.xaml
<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="下載保留" 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
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; //由於要應用BitmapImage
using System.IO; //由於要應用Stream
namespace HCLoad
{
public partial class UC_UpDown : UserControl
{
//1、WebClient 對象一次只能啟動一個要求。假如在一個要求完成（包含失足和撤消）前，即IsBusy為true時，停止第二個要求，則第二個要求將會拋出 NotSupportedException 類型的異常
//2、假如 WebClient 對象的 BaseAddress 屬性不為空，則 BaseAddress 與 URI（絕對地址） 組合在一路組成相對 URI
//3、WebClient 類的 AllowReadStreamBuffering 屬性：能否對從 Internet 資本吸收的數據做緩沖處置。默許值為true，將數據緩存在客戶端內存中，以便隨時被運用法式讀取
//獲得選定圖片信息
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發送下載流數據要求
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 - 該異步操作時代能否產生了毛病
//OpenReadCompletedEventArgs.Cancelled - 該異步操作能否已被撤消
//OpenReadCompletedEventArgs.Result - 下載後的 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)
{
//獲得下載的流數據(在此處是圖片數據)並顯示在圖片控件中
//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 - 以後收到的字節數
//DownloadProgressChangedEventArgs.TotalBytesToReceive - 總共須要下載的字節數
//DownloadProgressChangedEventArgs.UserState - 用戶標識
this.tbMsgString.Text = string.Format("完成百分比：{0} 以後收到的字節數：{1} 材料年夜小：{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 - 在翻開用於上傳的流完成時（包含撤消操作及有毛病產生時）所觸發的事宜
* WriteStreamClosed - 在寫入數據流的異步操作完成時（包含撤消操作及有毛病產生時）所觸發的事宜
* UploadProgressChanged - 上傳數據進程中所觸發的事宜。假如挪用 OpenWriteAsync() 則不會觸發此事宜
* Headers - 與要求相干的的標頭的 key/value 對**
* OpenWriteAsync(Uri address, string method, Object userToken) - 翻開流以應用指定的辦法向指定的 URI 寫入數據
* Uri address - 吸收上傳數據的 URI
* string method - 所應用的 HTTP 辦法（POST 或 GET）
* Object userToken - 須要上傳的數據流
*/
OpenFileDialog openFileDialog = new OpenFileDialog()
{ //彈出翻開文件對話框請求用戶本身選擇在當地端翻開的圖片文件
Filter = "Jpeg Files (*.jpg)|*.jpg|All Files(*.*)|*.*",
Multiselect = false //不許可多選
};
if (openFileDialog.ShowDialog() == true)//.DialogResult.OK)
{
//fileinfo = openFileDialog.Files; //獲得所選擇的文件，個中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(); //獲得所選文件的名字
#region 把圖片上傳到辦事器上
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("請拔取想要上載的圖片!!!");
}
}
}
void webclient_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e)
{
//將圖片數據流發送到辦事器上
// e.UserState - 須要上傳的流（客戶端流）
Stream clientStream = e.UserState as Stream;
// e.Result - 目的地址的流（辦事端流）
Stream serverStream = e.Result;
byte[] buffer = new byte[4096];
int readcount = 0;
// clientStream.Read - 將須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的地址的流
serverStream.Write(buffer, 0, readcount);
}
serverStream.Close();
clientStream.Close();
}
void webclient_WriteStreamClosed(object sender, WriteStreamClosedEventArgs e)
{
//斷定寫入能否有異常
if (e.Error != null)
{
System.Windows.Browser.HtmlPage.Window.Alert(e.Error.Message.ToString());
}
else
{
System.Windows.Browser.HtmlPage.Window.Alert("圖片上傳勝利!!!");
}
}
#endregion
private void Button_Click(object sender, RoutedEventArgs e)
{
//這類辦法弄不定，似乎提醒跨域操作。
//提醒：毛病：Unhandled Error in Silverlight Application 跨線程拜訪有效。
//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);
//經由過程挪用js代碼下載，比擬簡略。
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項面前目今新建WebClientUpLoadStreamHandler.ashx
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO; //由於要用到Stream
namespace HCLoad.Web
{
public class WebClientUpLoadStreamHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
//獲得上傳的數據流
string fileNameStr = context.Request.QueryString["fileName"];
Stream sr = context.Request.InputStream;
try
{
string filename = "";
filename = fileNameStr;
byte[] buffer = new byte[4096];
int bytesRead = 0;
//將以後數據流寫入辦事器端文件夾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("上傳勝利");
}
catch (Exception e)
{
context.Response.ContentType = "text/plain";
context.Response.Write("上傳掉敗, 毛病信息:" + e.Message);
}
finally
{ sr.Dispose(); }
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
新建download.ashx
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Net;
namespace HCLoad.Web
{
/// <summary>
/// $codebehindclassname$ 的摘要解釋
/// </summary>
public class download : IHttpHandler
{
private long ChunkSize = 102400;//100K 每次讀取文件，只讀取100Ｋ，如許可以減緩辦事器的壓力
public void ProcessRequest(HttpContext context)
{
//string fileName = "123.jpg";//客戶端保留的文件名
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;//取得下載文件的總年夜小
context.Response.ContentType = "application/octet-stream";
//告訴閱讀器下載文件而不是翻開
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));//讀取的年夜小
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
