上传了，如何下载呢。在线等候。

Question

SqlDataReader dr = command.ExecuteReader();
if(dr.Read())
{
Response.Clear();
Response.BinaryWrite((byte[])dr["MyFile"]);
}
dr.Close();
myconn.Close();
  }
如果我上传的是图片这样可以浏览，如果是文件我如何下载呢。

Answer 1

public static void DownLoadFile(string srcFile)
{
HttpContext context = HttpContext.Current;
Byte[] buffer = new Byte[10000];
int ReadLength;
long TotleLength;
Stream Fstream = null;

try
{
if(!File.Exists(srcFile))
throw new Exception("file were not found."); string filename = Path.GetFileName(srcFile); Fstream = new FileStream(srcFile,
FileMode.Open,
FileAccess.Read,
FileShare.Read);
TotleLength = Fstream.Length;
context.Response.ContentType = "Application/octec-stream";
context.Response.AddHeader("Content-Disposition",String.Concat("Attachment;filename=",HttpUtility.UrlEncode(filename)));                long p = 0;
               if(context.Request.Headers["Range"]!=null)
               {
                   context.Response.StatusCode = 206;
                    p = long.Parse(context.Request.Headers["Range"].Replace("bytes=","").Replace("-",""));
                }
                if(p != 0)
                 {
                    context.Response.AddHeader("Content-Range","bytes " + p.ToString() + "-" + ((long)(TotleLength - 1)).ToString() + "/" + TotleLength.ToString());                    
                 }
context.Response.AddHeader("Content-Length",((long)(TotleLength-p)).ToString());
                 Fstream.Position = p;
                 TotleLength = TotleLength - p; while(TotleLength > 0)
{
if(context.Response.IsClientConnected)
{
ReadLength = Fstream.Read(buffer,0,10000);
context.Response.OutputStream.Write(buffer,0,ReadLength);
context.Response.Flush();
buffer = new Byte[10000];
TotleLength -= ReadLength;
}
else
{
TotleLength = -1;
}
}
}
catch(Exception ex)
{
FileExplorer.FileError.ShowAlertMessage(ex.Message);
}
finally
{
if(Fstream != null)
{
Fstream.Close();
}
context.Response.End();
}
}