asp.net中下载文件的四种方式

来源：互联网发布：淘宝人生txt免费下载编辑：程序博客网时间：2024/05/16 14:48
 protected void Button1_Click(object sender, EventArgs e){//TransmitFile实现下载/* 微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite 下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。 代码如下：*/Response.ContentType = "application/x-zip-compressed";Response.AddHeader("Content-Disposition", "attachment;filename=test.txt");string filename = Server.MapPath("test.txt");Response.TransmitFile(filename);Response.Write("<script language=\"javascript\" type=\"text/javascript\">");Response.Write("alert(\"下载成功\");");Response.Write("window.location.href=\"test.aspx\";");Response.Write("</script>");}protected void Button2_Click(object sender, EventArgs e){//WriteFile实现下载string fileName = "testclient.txt";//客户端保存的文件名string filePath = Server.MapPath("test.txt");//路径FileInfo fileInfo = new FileInfo(filePath);Response.Clear();Response.ClearContent();Response.ClearHeaders();Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);Response.AddHeader("Content-Length", fileInfo.Length.ToString());Response.AddHeader("Content-Transfer-Encoding", "binary");Response.ContentType = "application/octet-stream";Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");Response.WriteFile(fileInfo.FullName);Response.Flush();Response.End();}protected void Button3_Click(object sender, EventArgs e){//WriteFile分块下载string fileName = "testclient.txt";//客户端保存的文件名string filePath = Server.MapPath("test.txt");//路径System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);if (fileInfo.Exists == true) {const long ChunkSize = 409600;//100K 每次读取文件，只读取100Ｋ，这样可以缓解服务器的压力byte[] buffer = new byte[ChunkSize]; Response.Clear(); System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);long dataLengthToRead = iStream.Length;//获取下载的文件总大小 Response.ContentType = "application/octet-stream"; Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));while (dataLengthToRead > 0 && Response.IsClientConnected) {int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小 Response.OutputStream.Write(buffer, 0, lengthRead); Response.Flush(); dataLengthToRead = dataLengthToRead - lengthRead; } Response.Close(); } }//字符流方式下载文件protected void Button4_Click(object sender, EventArgs e){string fileName = "testclient.txt";//客户端保存的文件名string filePath = Server.MapPath("test.txt");//路径//以字符流的形式下载文件FileStream fs = new FileStream(filePath, FileMode.Open);byte[] bytes = new byte[(int)fs.Length];fs.Read(bytes, 0, bytes.Length);fs.Close();Response.ContentType = "application/octet-stream";//通知浏览器下载文件而不是打开Response.AddHeader("Content-Disposition", "attachment;   filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));Response.BinaryWrite(bytes);Response.Flush();Response.End();}
转载自：http://blog.itpub.net/12639172/viewspace-608431/
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