C # Response Download

//TransmitFile实现下载 

     protected void Button1_Click( object sender, EventArgs e)       {           /*           微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite           下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。           代码如下：           */             Response.ContentType =  "application/x-zip-compressed" ;           string FileName =  "test.doc" ;           //使用UTF-8对文件名进行编码           Response.AppendHeader( "Content-Disposition" ,  "attachment;filename=\"" + HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) +  "\"" );           Response.ContentType =  "application/octet-stream" ;           Response.AddHeader( "Content-Disposition" ,  "attachment;filename=" + FileName);           string filename = Server.MapPath( "../ReportTemplate/test.doc" );           Response.TransmitFile(filename);       }          //WriteFile实现下载       protected void Button2_Click( object sender, EventArgs e)       {            /*           using System.IO;                    */          string fileName =  "test.doc" ; //客户端保存的文件名           string filePath = Server.MapPath( "../ReportTemplate/test.doc" ); //路径           FileInfo fileInfo =  new FileInfo(filePath);           Response.Clear();           Response.ClearContent();           Response.ClearHeaders();           Response.AddHeader( "Content-Disposition" ,  "attachment;filename=\"" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8) +  "\"" );           Response.AddHeader( "Content-Length" , fileInfo.Length.ToString());           Response.AddHeader( "Content-Transfer-Encoding" ,  "binary" );           Response.ContentType =  "application/octet-stream" ;           Response.WriteFile(fileInfo.FullName);           Response.Flush();           Response.End();       }          //WriteFile分块下载       protected void Button3_Click( object sender, EventArgs e)       {           string fileName =  "test.doc" ; //客户端保存的文件名           string filePath = Server.MapPath( "../ReportTemplate/test.doc" ); //路径                 System.IO.FileInfo fileInfo =  new System.IO.FileInfo(filePath);                 if (fileInfo.Exists ==  true )           {               const long ChunkSize = 102400;  //100K 每次读取文件，只读取100K，这样可以缓解服务器的压力               byte [] buffer =  new byte [ChunkSize];                     Response.Clear();               System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);               long dataLengthToRead = iStream.Length;  //获取下载的文件总大小               Response.ContentType =  "application/octet-stream" ;               Response.AddHeader( "Content-Disposition" ,                   "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));               while (dataLengthToRead > 0 && Response.IsClientConnected)               {                   int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));  //读取的大小                   Response.OutputStream.Write(buffer, 0, lengthRead);                   Response.Flush();                   dataLengthToRead = dataLengthToRead - lengthRead;               }               Response.Close();           }       }          //流方式下载       protected void Button4_Click( object sender, EventArgs e)       {           string fileName =  "test.doc" ; //客户端保存的文件名           string filePath = Server.MapPath( "../ReportTemplate/test.doc" ); //路径              //以字符流的形式下载文件           FileStream fs =  new FileStream(filePath, FileMode.Open);           byte [] bytes =  new byte [( int )fs.Length];           fs.Read(bytes, 0, bytes.Length);           fs.Close();           Response.ContentType =  "application/octet-stream" ;           //通知浏览器下载文件而不是打开           Response.AddHeader( "Content-Disposition" ,  "attachment;  filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));           Response.BinaryWrite(bytes);           Response.Flush();           Response.End();       }  }

C # Response Download