C#四种下载文件方法

Button5事件在我本机测试有问题。大家可以再看看。

 //TransmitFile下载
        protected void Button1_Click(object sender, EventArgs e)
        {
            //Response.ContentType = "application/x-zip-compressed";
            Response.AddHeader("Content-Disposition", "attachment;filename=1.txt");
            string filename = Server.MapPath("/UpLoadFile/1.txt");
            Response.TransmitFile(filename);
        }

        //WriteFile下载
        protected void Button2_Click(object sender, EventArgs e)
        {
            string fileName = "1.txt";//客户端保存的文件名
            string filePath = Server.MapPath("/UpLoadFile/1.txt");//路径

            FileInfo fileInfo = new FileInfo(filePath);
            Response.Clear();
            Response.ClearContent();
            Response.ClearHeaders();
            Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);      //加上这行可下载txt文档(通知浏览器是下载文件而不是打开)
            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();
        }

        //WriteFile分块下载
        protected void Button3_Click(object sender, EventArgs e)
        {
            string fileName = "aaa.txt";//客户端保存的文件名
            string filePath = Server.MapPath("/UpLoadFile/1.txt");//路径

            System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);

            if (fileInfo.Exists == true)
            {
                const long ChunkSize = 102400;//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();
            }
        }

        //流下载
        protected void Button4_Click(object sender, EventArgs e)
        {
            string fileName = "aaa.txt";//客户端保存的文件名
            string filePath = Server.MapPath("/UpLoadFile/1.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();
        }


        //保存文件并打开
        protected void Button5_Click(object sender, EventArgs e)
        {
            //string filePath = Server.MapPath("/UpLoadFile/");//路径
            ////这里输入你要下载的url地址
            //string remoteUri = filePath;
            ////输入下载的文件名称
            //string fileName = "pic.jpg", myStringWebResource = null;
            ////创建WebClient实例
            //WebClient myWebClient = new WebClient();
            //// web地址全名
            //myStringWebResource = remoteUri + fileName;
            //Console.WriteLine("Downloading File \"{0}\" from \"{1}\" .......\n\n", fileName, myStringWebResource);
            //// 下载保存文件到程序运行目录下
            //myWebClient.DownloadFile(myStringWebResource, fileName);
            //Console.WriteLine("Successfully Downloaded File \"{0}\" from \"{1}\"", fileName, myStringWebResource);
            //Console.WriteLine("\nDownloaded file saved in the following file system folder:\n\t" + Application.StartupPath);

            //// 打开文件
            //Process myProcess = new Process();

            //myProcess.StartInfo.FileName = Application.StartupPath + "\\" + fileName;
            //myProcess.StartInfo.Verb = "Open";
            //myProcess.StartInfo.CreateNoWindow = true;
            //myProcess.Start();
        }