response输出任何文件 response 文件

protected   void  Button1_Click( object  sender, EventArgs e)
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      {
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          // TransmitFile实现下载 
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          /* 
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          微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite
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          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。
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          代码如下：
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          */ 
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         Response.ContentType  =   " application/x-zip-compressed " ;
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         Response.AddHeader( " Content-Disposition " ,  " attachment;filename=keji.rar " );
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          string  filename  =  Server.MapPath( " keji.rar " );
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         Response.TransmitFile(filename);
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         Response.Write( " <script language=/ " javascript/ "  type=/ " text / javascript/ " > " );
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         Response.Write( " alert(/ " 下载成功/ " ); " );
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         Response.Write( " window.location.href=/ " C_SC.aspx/ " ; " );
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         Response.Write( " </script> " );
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     } 
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      protected   void  Button2_Click( object  sender, EventArgs e)
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      {
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          // WriteFile实现下载 
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          string  fileName  =   " ceshi.rar " ; // 客户端保存的文件名 
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          string  filePath  =  Server.MapPath( " keji.rar " ); // 路径 
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         FileInfo fileInfo  =   new  FileInfo(filePath);
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         Response.Clear();
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         Response.ClearContent();
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         Response.ClearHeaders();
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         Response.AddHeader( " Content-Disposition " ,  " attachment;filename= "   +  fileName);
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         Response.AddHeader( " Content-Length " , fileInfo.Length.ToString());
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         Response.AddHeader( " Content-Transfer-Encoding " ,  " binary " );
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         Response.ContentType  =   " application/octet-stream " ;
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         Response.ContentEncoding  =  System.Text.Encoding.GetEncoding( " gb2312 " );
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         Response.WriteFile(fileInfo.FullName);
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         Response.Flush();
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         Response.End();
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     } 
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      protected   void  Button3_Click( object  sender, EventArgs e)
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      {
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          // WriteFile分块下载 
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          string  fileName  =   " GhostXP.iso " ; // 客户端保存的文件名 
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          string  filePath  =  Server.MapPath( " GhostXP7.7.iso " ); // 路径 
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          System.IO.FileInfo fileInfo  =   new  System.IO.FileInfo(filePath);
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          if  (fileInfo.Exists  ==   true )
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           {
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              const   long  ChunkSize  =   409600 ; // 100K 每次读取文件，只读取100Ｋ，这样可以缓解服务器的压力 
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              byte [] buffer  =   new   byte [ChunkSize];
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              Response.Clear();
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              System.IO.FileStream iStream  =  System.IO.File.OpenRead(filePath);
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              long  dataLengthToRead  =  iStream.Length; // 获取下载的文件总大小 
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              Response.ContentType  =   " application/octet-stream " ;
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              Response.AddHeader( " Content-Disposition " ,  " attachment; filename= "   +  HttpUtility.UrlEncode(fileName));
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              while  (dataLengthToRead  >   0   &&  Response.IsClientConnected)
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               {
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                  int  lengthRead  =  iStream.Read(buffer,  0 , Convert.ToInt32(ChunkSize)); // 读取的大小 
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                  Response.OutputStream.Write(buffer,  0 , lengthRead);
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                  Response.Flush();
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                  dataLengthToRead  =  dataLengthToRead  -  lengthRead;
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              } 
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              Response.Close();
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          } 
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      } 
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      // 字符流方式下载文件 
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      protected   void  Button4_Click( object  sender, EventArgs e)
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      {
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          string  fileName  =   " ce2.rar " ; // 客户端保存的文件名 
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          string  filePath  =  Server.MapPath( " keji.rar " ); // 路径
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          // 以字符流的形式下载文件 
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         FileStream fs  =   new  FileStream(filePath, FileMode.Open);
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          byte [] bytes  =   new   byte [( int )fs.Length];
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         fs.Read(bytes,  0 , bytes.Length);
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         fs.Close();
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         Response.ContentType  =   " application/octet-stream " ;
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          // 通知浏览器下载文件而不是打开 
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         Response.AddHeader( " Content-Disposition " ,  " attachment;   filename= "   +  HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
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         Response.BinaryWrite(bytes);
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         Response.Flush();
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         Response.End();
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     }