try { string filepath = context.Server.MapPath(context.Request.QueryString["filedir"].ToString() + "/" + context.Request.QueryString[0].Substring(0, 4).ToString() + "/" + context.Request.QueryString[0].ToString()); string filename = context.Request.QueryString[1].ToString(); FileInfo info = new FileInfo(filepath); long fileSize = info.Length; context.Response.Clear(); context.Response.ContentType = "application/x-zip-compressed"; context.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8)); //不指明Content-Length用Flush的話不會顯示下載進度 context.Response.AddHeader("Content-Length", fileSize.ToString()); context.Response.TransmitFile(filepath, 0, fileSize); context.Response.Flush(); context.Response.Close(); } catch { } 為什么會在99%時卡住，要等個幾分鐘才結束，也不是每次都這樣，求指導，或者誰給個自己用的順手的下載代碼，謝謝。