ASP.NET文件下载函数

在你的Page_Load中添加这样的代码:


Page.Response.Clear();


bool success = ResponseFile(Page.Request, Page.Response, "目的文件名称", @"源文件路径", 1024000);


if (!success)


Response.Write("下载文件出错！");


Page.Response.End();

文件下载函数代码为:


public static bool ResponseFile(HttpRequest _Request,HttpResponse _Response,string _fileName,string _fullPath, long _speed)






{


try






{


FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);


BinaryReader br = new BinaryReader(myFile);


try






{


_Response.AddHeader("Accept-Ranges", "bytes");


_Response.Buffer = false;


long fileLength = myFile.Length;


long startBytes = 0;




double pack = 10240; //10K bytes


//int sleep = 200; //每秒5次 即5*10K bytes每秒


int sleep = (int)Math.Floor(1000 * pack / _speed) + 1;


if (_Request.Headers["Range"] != null)






{


_Response.StatusCode = 206;




string[] range = _Request.Headers["Range"].Split(new char[]

{'=', '-'});


startBytes = Convert.ToInt64(range[1]);


}


_Response.AddHeader("Content-Length", (fileLength - startBytes).ToString());


if (startBytes != 0)






{


//Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength-1, fileLength));


}


_Response.AddHeader("Connection", "Keep-Alive");


_Response.ContentType = "application/octet-stream";


_Response.AddHeader("Content-Disposition","attachment;filename=" + HttpUtility.UrlEncode(_fileName,System.Text.Encoding.UTF8) );




br.BaseStream.Seek(startBytes, SeekOrigin.Begin);


int maxCount = (int) Math.Floor((fileLength - startBytes) / pack) + 1;




for (int i = 0; i < maxCount; i++)






{


if (_Response.IsClientConnected)






{


_Response.BinaryWrite(br.ReadBytes(int.Parse(pack.ToString())));


Thread.Sleep(sleep);


}


else






{


i=maxCount;


}


}


}


catch






{


return false;


}


finally






{


br.Close();




myFile.Close();


}


}


catch






{


return false;


}


return true;


}

这样就实现了文件下载时,不管是什么格式的文件,都能够弹出打开/保存窗口.