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The author:(作者)aaa
published in(发表于) 2013/12/8 7:50:46
ASP.NET技巧:下载文件关闭窗体之解决方法_.net资料_编程技术

ASP.NET技巧:下载文件关闭窗体之解决方法_.net资料_编程技术-你的首页-uuhomepage.com

对于下载时新打开一窗口下载,下载完后需要关闭的
一种:对于较小文件可以有效:
System.IO.FileInfo file = new System.IO.FileInfo("F:\\mp3\\mp3\\别哭我最爱的人.mp3");
Response.Clear();
Response.ClearHeaders();
Response.Buffer = false;
Response.Charset="GB2312";
Response.ContentEncoding=System.Text.Encoding.UTF8;
Response.ContentType = "application/octet-stream";

Response.AddHeader("Content-Disposition", "attachment; filename="+Server.UrlEncode("别哭我最爱的人.mp3"));
Response.AddHeader("Content-Length", file.Length.ToString());



Response.WriteFile(file.FullName);
Response.Flush();
Response.End();
该代码可以实现输出文件并将新打开的窗体关闭。


另一种对于大文件,我们用上述代码不是较好,因为上述代码是将文件全缓存于服务器后才输出的,如果你的服务器流量大,且文件较大,不建议用以上方法。


以下我测试过,较好能解决:
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;

int pack = 10240; //10K bytes
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(pack));
Thread.Sleep(sleep);
}
else
{
i=maxCount;
}
}
_Response.Flush();
}
catch
{
return false;
}
finally
{
br.Close();
myFile.Close();
}
}
catch
{
return false;
}
return true;
}
这一种代码也是借签网上的
它也可以实现输出文件并关闭新打开幕窗体


另外在测试当中发现,服务器端与客户的操作系统不同
也会有一些意想不到的事情发生
一般来说,用以上代码,如不能正常关闭,你可以查阅浏览器的设置,在高级中。
再者,你可以修改不同的输出内容类型Response.ContentType = "application/octet-stream";因为不同的contenttype,在客户的端的解释可能是不一样的。
有想法请回复,欢迎讨论






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