下载文件

例一：

         string  strFullFileName  =  Server.MapPath( " . "   +   " /ViewSi.aspx.cs " ); // D:CVS网上订舱V2_2srcPHY.Booking.WebAppSI
        FileInfo DownloadFile  =   new  FileInfo(strFullFileName);
        Response.Clear();
        Response.ClearHeaders();
        Response.Buffer  =   false ;
        Response.ContentType  =   " application/octet-stream " ;
        Response.AppendHeader( " Content-Disposition " ,  " attachment;filename= "   +  HttpUtility.UrlEncode(DownloadFile.FullName, System.Text.Encoding.UTF8));
        Response.AppendHeader( " Content-Length " , DownloadFile.Length.ToString());
        Response.WriteFile(DownloadFile.FullName);
        Response.Flush();
        Response.End();

例二：

  string  strFullFileName  =  Server.MapPath( " . "   +   " /sqlnet.log " );
        System.IO.FileStream r  =   new  System.IO.FileStream(strFullFileName, System.IO.FileMode.Open);
         // 设置基本信息
        Response.Buffer  =   false ;
        Response.AddHeader( " Connection " ,  " Keep-Alive " );
        Response.ContentType  =   " application/octet-stream " ;
        Response.AddHeader( " Content-Disposition " ,  " attachment;filename= "   +  System.IO.Path.GetFileName(strFullFileName));
        Response.AddHeader( " Content-Length " , r.Length.ToString());
         while  ( true )
         ... {
            //开辟缓冲区空间
            byte[] buffer = new byte[1024];
            //读取文件的数据
            int leng = r.Read(buffer, 0, 1024);
            if (leng == 0)//到文件尾，结束
                break;
            if (leng == 1024)//读出的文件数据长度等于缓冲区长度，直接将缓冲区数据写入
                Response.BinaryWrite(buffer);
            else
            ...{
                //读出文件数据比缓冲区小，重新定义缓冲区大小，只用于读取文件的最后一个数据块
                byte[] b = new byte[leng];
                for (int i = 0; i < leng; i++)
                    b[i] = buffer[i];
                Response.BinaryWrite(b);
            }
        }
        r.Close(); // 关闭下载文件
        Response.End(); // 结束文件下载