ASP.NET 文件下载
2011-05-31 17:04 音乐让我说 阅读(346) 评论(0) 编辑 收藏 举报以前写过很多关于ASP.NET 下载文件的代码,一直没有保存到博客上,今天的项目要用到下载的功能,自己懒得再写,就在网上Copy 了一份,还不错!
代码如下:
<asp:Button ID="btnDownload" runat="server" Text="下载" OnClick="btnDownload_Click" />
protected void btnDownload_Click(object sender, EventArgs e) { Response.Clear(); bool success = ResponseFile(Request, Response, "aaa.exe", @"D:\aaa.exe", 1024000); if (!success) { Response.Write("下载文件出错!"); } Response.End(); } /// <summary> /// 下载文件 /// </summary> /// <param name="_Request">HttpRequest 对象</param> /// <param name="_Response">HttpResponse 对象</param> /// <param name="_fileName">显示到客户端下载界面中的名字,必须带文件的后缀</param> /// <param name="_fullPath">目标文件的物理路径</param> /// <param name="_speed">下载速率</param> /// <returns>相应结果, true 表示成功</returns> 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; }
谢谢浏览!
作者:音乐让我说(音乐让我说 - 博客园)
出处:http://music.cnblogs.com/
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