关于文件下栽的问题???

Question

private void DownLoadFile(string FileName)
{
if(!System.IO.File.Exists(FileName))   
{   
Response.Write("<script   language='javascript'>alert('对不起，文件不存在！');</script>");   
return;   
}  
Response.Clear();   
Response.ClearHeaders();  
Response.BufferOutput=false;
Response.Charset="GB2312";   
Response.ContentEncoding=System.Text.Encoding.UTF8;   
Response.ContentType="application/octet-stream";     
FileInfo   fi=new  FileInfo(FileName);   
Response.AddHeader("Content-Disposition","attachment;filename="+HttpUtility.UrlEncode(fi.Name));   
Response.AddHeader("Content-Length",fi.Length.ToString());   
byte[]  tmpbyte=new  byte[1024*8];   
FileStream   fs=fi.OpenRead();   
int   count;   
while((count=fs.Read(tmpbyte,0,tmpbyte.Length))>0)   
{   
Response.BinaryWrite(tmpbyte);   
Response.Flush();   
}  

fs.Close();
Response.End(); 

}该函数第一次执行时没有问题,能够下载成功,但当第二次执行时整个页面变成了刚才下载的文件内容的一部分,这是怎么回事?请高手解决.

Answer 1

newsid = Request.Params["id"];
        string sql = System.Configuration.ConfigurationManager.AppSettings["strConn"].ToString();
        SqlConnection strConn = new SqlConnection(sql);
        strConn.Open();
        string sql1 = " select * from 公告表 where id = '"+newsid +"'";
        SqlCommand mycommand = new SqlCommand(sql1, strConn);
        SqlDataReader dr = mycommand.ExecuteReader();
        if (dr.Read())
        {
            //string km = dr["附件类型"].ToString().Trim();
            Response.ContentType = "application/x-msdownload";
            string fn = dr["文件名"].ToString().Trim ();
            
            string name = fn ;
              // 添加 信息， "文件下 /另存 "  框指定默 文件名
            Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(name ));
            // 添加 信息，指定文件大小， 浏览器显示下载进度
            //Response.AddHeader("Content-Length", barrImage.Length.ToString());
            //Response.BinaryWrite(ms.ToArray());
            Response.BinaryWrite((byte[])dr["附件"]);
            Response.Flush();
            Response.End();
        }
        dr.Close();
        strConn.Close();
         
    }

Answer 2

lz请参考
System.IO.FileInfo file = new System.IO.FileInfo(FileName);
if (file.Exists)
{
Response.Clear();
Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(file.Name));
Response.AddHeader("Content-Length", file.Length.ToString());
Response.ContentType = "application/octet-stream";
Response.Filter.Close();
Response.WriteFile(file.FullName);               
Response.End();
}

Answer 3

string fullPath=“”；
if(System.IO.File.Exists(fullPath) )
{
Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode("文件名"));
Response.WriteFile(fullPath);
Response.End();
}

Answer 4

使用
 Response.WriteFile(fullPath);
Response.End();
没有下载过程,
用byte[]  tmpbyte=new  byte[1024*8];   
FileStream   fs=fi.OpenRead();   
int   count;   
while((count=fs.Read(tmpbyte,0,tmpbyte.Length))>0)   
{   
Response.BinaryWrite(tmpbyte);   
Response.Flush();   
}  
可以显示下载过程!

Answer 5

用一个新页面在 page_load 的时候完成下载就ｏｋ了，直接在当前页面下会有问题。