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The author:(作者)delvpublished in(发表于) 2014/1/10 6:28:03 ASP.NET技巧:下载文件关闭窗体之解决方法_[Asp.Net教程]
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
来源:网络
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