老斑不要删了哦


'函数名：ResponseFile
'功能 ：客户端从服务器端下载一个文件
'返回值：返回True表示服务器响应成功，返回False表示失败
'参数 ：
' PageResponse 响应客户端的Response对象，用Page.Response引用
' DownloadFileName 客户端下载文件的文件名
' LocalFilePath 服务器端待下载文件的路径
' DownloadBuffer 服务器端读取文件的缓冲区大小，单位为KB
Public Function ResponseFile(ByRef PageResponse As HttpResponse, ByVal DownloadFileName As String, ByVal LocalFilePath As String, ByVal DownloadBuffer As Long) As Boolean
Dim Reader As System.IO.FileStream
Dim Buffer() As Byte
Dim FileLength As Long
Dim FileBuffer As Long = 1024 * DownloadBuffer
Dim ReadCount As Long
ReadCount = FileBuffer
ReDim Buffer(ReadCount - 1)
Try
Reader = System.IO.File.OpenRead(LocalFilePath)
FileLength = Reader.Length
Try
PageResponse.Buffer = False
PageResponse.AddHeader("Connection", "Keep-Alive")
PageResponse.ContentType = "application/octet-stream"
PageResponse.AddHeader("Content-Disposition", "attachment;filename=" + DownloadFileName)
PageResponse.AddHeader("Content-Length", FileLength.ToString)
While ReadCount = FileBuffer
ReadCount = Reader.Read(Buffer, 0, FileBuffer)
ReDim Preserve Buffer(ReadCount - 1)
PageResponse.BinaryWrite(Buffer)
End While
Response.End()
Catch ex As Exception
Return False
Finally
Reader.Close()
End Try
Catch ex As Exception
Return False
End Try
Return True
End Function

嘿嘿。vb的哦。我来提供个c#的
string strFile = Server.MapPath("文件路径");//路径根据实际情况而定
if (!System.IO.File.Exists(strFile))
{
Response.Write("<script language='javascript'>alert('对不起，文件不存在！');</script>");
Response.Redirect("downlist.aspx");
return;
}
Response.Clear();
Response.ClearHeaders();
Response.Charset = "GB2312";
Response.ContentEncoding = System.Text.Encoding.UTF8;
Response.ContentType = "application/octet-stream";
FileInfo fi = new FileInfo(strFile);
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();