ASP.NET 下载文件方式

protected void Button1_Click(object sender, EventArgs e) ?{ ?/* ?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=z.zip"); ?string filename = Server.MapPath("DownLoad/aaa.zip"); ?Response.TransmitFile(filename); ?} ?//WriteFile实现下载 ?protected void Button2_Click(object sender, EventArgs e) ?{ ?/* ?using System.IO; ?????*/ ?string fileName ="aaa.zip";//客户端保存的文件名 ?string filePath=Server.MapPath("DownLoad/aaa.zip");//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(); ?} ?//WriteFile分块下载 ?protected void Button3_Click(object sender, EventArgs e) ?{ ?string fileName = "aaa.zip";//客户端保存的文件名 ?string filePath = Server.MapPath("DownLoad/aaa.zip");//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(); ?} ?} ?//流方式下载 ?protected void Button4_Click(object sender, EventArgs e) ?{ ?string fileName = "aaa.zip";//客户端保存的文件名 ?string filePath = Server.MapPath("DownLoad/aaa.zip");//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(); ?}