silverlight webclient实现上传、下载、删除、读取文件

1.上传

  private void Button_Click_1(object sender, RoutedEventArgs e)

         {

             OpenFileDialog openFileDialog = new OpenFileDialog()

              {  //弹出打开文件对话框要求用户自己选择在本地端打开的图片文件

                  Filter = "Jpeg Files (*.jpg)|*.jpg|All Files(*.*)|*.*",

                  Multiselect = false  //不允许多选

              };

             if (openFileDialog.ShowDialog() == true)//.DialogResult.OK)

             {

                 //fileinfo = openFileDialog.Files; //取得所选择的文件，其中Name为文件名字段，作为绑定字段显示在前端

                 FileInfo fileinfo = openFileDialog.File;

                 if (fileinfo != null)

                 {

                     WebClient webclient = new WebClient();

                     string uploadFileName = fileinfo.Name.ToString(); //获取所选文件的名字

                     #region 把文件上传到服务器上

                     Uri upTargetUri = new Uri(String.Format("http://localhost:" + HtmlPage.Document.DocumentUri.Port + "/WebClientUpLoadStreamHandler.ashx?fileName={0}", uploadFileName), UriKind.Absolute); //指定上传处理程序

                     webclient.OpenWriteCompleted += new OpenWriteCompletedEventHandler(webclient_OpenWriteCompleted);

                     webclient.Headers["Content-Type"] = "multipart/form-data";//"application/x-www-form-urlencoded";// 

                     webclient.OpenWriteAsync(upTargetUri, "POST", fileinfo.OpenRead());

                     webclient.WriteStreamClosed += new WriteStreamClosedEventHandler(webclient_WriteStreamClosed);

                     #endregion

                 }

                 else

                 {

                     MessageBox.Show("请选取想要上载的图片!!!");

                 }

             }

         }

         void webclient_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e)

         {

             //将图片数据流发送到服务器上

             // e.UserState - 需要上传的流（客户端流）

             Stream clientStream = e.UserState as Stream;

             // e.Result - 目标地址的流（服务端流）

             Stream serverStream = e.Result;

             byte[] buffer = new byte[clientStream.Length];

             int readcount = ;

             // clientStream.Read - 将需要上传的流读取到指定的字节数组中

             while ((readcount = clientStream.Read(buffer, , buffer.Length)) > )

             {

                 // serverStream.Write - 将指定的字节数组写入到目标地址的流

                 serverStream.Write(buffer, , readcount);

             }

             serverStream.Close();

             clientStream.Close();

         }

         void webclient_WriteStreamClosed(object sender, WriteStreamClosedEventArgs e)

         {

             //判断写入是否有异常

             if (e.Error != null)

             {

                 System.Windows.Browser.HtmlPage.Window.Alert(e.Error.Message.ToString());

             }

             else

             {

                 System.Windows.Browser.HtmlPage.Window.Alert("文件上传成功!!!");

             }

         }

 using System;

 using System.Collections.Generic;

 using System.IO;

 using System.Linq;

 using System.Web;

 namespace SilverlightApplication9.Web

 {

     /// <summary>

     /// WebClientUpLoadStreamHandler 的摘要说明

     /// </summary>

     public class WebClientUpLoadStreamHandler : IHttpHandler

     {

         public void ProcessRequest(HttpContext context)

         {

             //获取上传的数据流

             string fileNameStr = context.Request.QueryString["fileName"];

             Stream sr = context.Request.InputStream;

             try

             {

                 string filename = "";

                 filename = fileNameStr;

                 byte[] buffer = new byte[];

                 int bytesRead = ;

                 //将当前数据流写入服务器端文件夹ClientBin下

                 string targetPath = context.Server.MapPath("Pics/" + filename);

                 using (FileStream fs = File.Create(targetPath, ))

                 {

                     while ((bytesRead = sr.Read(buffer, , buffer.Length)) > )

                     {

                         //向文件中写信息

                         fs.Write(buffer, , bytesRead);

                     }

                 }

                 context.Response.ContentType = "text/plain";

                 context.Response.Write("上传成功");

             }

             catch (Exception e)

             {

                 context.Response.ContentType = "text/plain";

                 context.Response.Write("上传失败, 错误信息:" + e.Message);

             }

             finally

             { sr.Dispose(); }

         }

         public bool IsReusable

         {

             get

             {

                 return false;

             }

         }

     }

 }

2.下载
2.1下载方法1

  #region  下载图片

         SaveFileDialog sfd = null;

         private void btnDownload_Click(object sender, RoutedEventArgs e)

         {

             //向指定的Url发送下载流数据请求

             string imgUrl = "http://localhost:51896/Pics/Wildlife.wmv";

             Uri endpoint = new Uri(imgUrl);

             sfd = new SaveFileDialog()

             {

                 DefaultExt = "jpeg",

                 Filter = "Text files (*.jpeg)|*.jpeg|All files (*.*)|*.*",

                 FilterIndex =

             };

             if (sfd.ShowDialog() == true)

             {

                 Uri end1point = new Uri(imgUrl);

                 WebClient client = new WebClient();

                 client.OpenReadCompleted += (ss, ee) =>

                 {

                     Stream pngStream = ee.Result;

                     byte[] binaryData = new Byte[pngStream.Length];

                     pngStream.Read(binaryData, , (int)pngStream.Length);

                     Stream stream = sfd.OpenFile();

                     stream.Write(binaryData, , binaryData.Length);

                     stream.Close();

                 };

                 client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(clientDownloadStream_DownloadProgressChanged);

                 client.OpenReadAsync(endpoint);

             }

         }

         void clientDownloadStream_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)

         {

             //DownloadProgressChangedEventArgs.ProgressPercentage - 下载完成的百分比

             //DownloadProgressChangedEventArgs.BytesReceived - 当前收到的字节数

             //DownloadProgressChangedEventArgs.TotalBytesToReceive - 总共需要下载的字节数

             //DownloadProgressChangedEventArgs.UserState - 用户标识

             this.tbMsgString.Text = string.Format("完成百分比：{0} 当前收到的字节数：{1} 资料大小：{2} ",

               e.ProgressPercentage.ToString() + "%",

               e.BytesReceived.ToString(),

               e.TotalBytesToReceive.ToString());

         }

         #endregion

2.2下载方法2

  private void btnDownload_Click(object sender, RoutedEventArgs e)

         {

             System.Windows.Browser.HtmlPage.Window.Eval("window.location.href='http://localhost:51896/download.ashx?filename=IMG_20140329_093302.jpg';");

 }

 using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Web;

 namespace SilverlightApplication9.Web

 {

     /// <summary>

     /// download 的摘要说明

     /// </summary>

     public class download : IHttpHandler

     {

         private long ChunkSize = ;//100K 每次读取文件，只读取100Ｋ，这样可以缓解服务器的压力

         public void ProcessRequest(HttpContext context)

         {

             //string fileName = "123.jpg";//客户端保存的文件名

             String fileName = context.Request.QueryString["filename"];

             string filePath = context.Server.MapPath(@"Pics/IMG_20140329_093302.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;//获得下载文件的总大小

                 context.Response.ContentType = "application/octet-stream";

                 //通知浏览器下载文件而不是打开

                 context.Response.AddHeader("Content-Disposition", "attachment;  filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));

                 while (dataLengthToRead >  && context.Response.IsClientConnected)

                 {

                     int lengthRead = iStream.Read(buffer, , Convert.ToInt32(ChunkSize));//读取的大小

                     context.Response.OutputStream.Write(buffer, , 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;

             }

         }

     }

 }

3.删除

  private void WebClientCommand(string isDeleteParam, int sort)

         {

             string uploadFileName = null;

             WebClient webclient = new WebClient();

                            Uri upTargetUri = new Uri(String.Format("http://localhost:" + HtmlPage.Document.DocumentUri.Port + "/WebClientUpLoadStreamHandler.ashx?fileName={0}&result={1}", uploadFileName, isDeleteParam), UriKind.Absolute);

                 webclient.UploadStringCompleted += webclient_UploadStringCompleted;

                 webclient.UploadStringAsync(upTargetUri,"");

         }

  void webclient_UploadStringCompleted(object sender, UploadStringCompletedEventArgs e)

         {

             if (e.Error == null)

             {

                 EasySL.Controls.Window.Alert("删除成功", this.floatePanel);

             }

         }

 using Huitu.Bjsq.Service;

 using System;

 using System.Collections.Generic;

 using System.IO;

 using System.Linq;

 using System.Web;

 namespace EasySL.Web

 {

     /// <summary>

     /// WebClientUpLoadStreamHandler 的摘要说明

     /// </summary>

     public class WebClientUpLoadStreamHandler : IHttpHandler

     {

         public void ProcessRequest(HttpContext context)

         {

             //获取上传的数据流

             string fileNameStr = context.Request.QueryString["fileName"];

             string paramResult = context.Request.QueryString["result"];

             Stream sr = context.Request.InputStream;

             try

             {

                 string filename = "";

                 filename = fileNameStr;

                 byte[] buffer = new byte[];

                 int bytesRead = ;

                 if (!string.IsNullOrEmpty(paramResult))

                 {

                     foreach (string item in paramResult.Split('|'))

                     {

                         string paramDel = context.Server.MapPath("FileLoad/" + item);

                         if (File.Exists(paramDel))

                         {

                             File.Delete(paramDel);

                             context.Response.ContentType = "text/plain";

                             context.Response.Write("删除成功");

                         }

                     }

                 }

                 else

                 {

                     //将当前数据流写入服务器端文件夹ClientBin下

                     string targetPath = context.Server.MapPath("FileLoad/" + filename);

                     using (FileStream fs = File.Create(targetPath, ))

                     {

                         while ((bytesRead = sr.Read(buffer, , buffer.Length)) > )

                         {

                             //向文件中写信息

                             fs.Write(buffer, , bytesRead);

                         }

                     }

                     context.Response.ContentType = "text/plain";

                     context.Response.Write("上传成功");

                 }

             }

             catch (Exception e)

             {

                 context.Response.ContentType = "text/plain";

                 context.Response.Write("上传失败, 错误信息:" + e.Message);

             }

             finally

             { sr.Dispose(); }

         }

         public bool IsReusable

         {

             get

             {

                 return false;

             }

         }

     }

 }

4.对于处理上传大文件的处理

 <configuration>

     <system.web>

       <compilation debug="true" targetFramework="4.5" />

       <httpRuntime targetFramework="4.5" maxRequestLength="" executionTimeout="" />

     </system.web>

 </configuration>

5.将程序发布在iis上注意的问题（代码是VS服务器运行正常，但是发布到IIS后上传文件总是失败。后来发现，我发布到IIS的虚拟目录，所以路径变了。）

Uri uri = new Uri(string.Format("/DataHandler.ashx?filename={0}", fileName), UriKind.Relative);

// Uri uri = new Uri("http://localhost/SEManage/UploadImg.ashx", UriKind.Absolute);
WebClient client = new WebClient();

将Uri中的绝对路径，修改为相对路径

6.读取文件操作（.txt）

private void SetWeather()

{

    WebClient downReader = new WebClient();

downReader.Encoding = System.Text.Encoding.UTF8;

            downReader.OpenReadCompleted += (s, e) =>

            {

                if (e.Error == null)

                {

                    using (StreamReader reader = new StreamReader(e.Result))

                    {

                        string[] line = reader.ReadToEnd().Split('|');

                     }

                  }

                }

 downReader.OpenReadAsync(new Uri("../AppConfig/Weather.txt", UriKind.Relative));

}

   private void WeatherDispatcherTimer()

        {

            //创建计时器

            System.Windows.Threading.DispatcherTimer myWeatherTimer = new System.Windows.Threading.DispatcherTimer();

            //创建间隔时间

            myWeatherTimer.Interval = new TimeSpan(, , , );

            //创建到达间隔时间后需执行的函数

            myWeatherTimer.Tick += (ss, ee) =>

            {

                InitDataWeather();

            };

            myWeatherTimer.Start();

        }

巴特西

silverlight webclient实现上传、下载、删除、读取文件

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