//四、流方式下载 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("DownLoad/aaa.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 String s = fileName; byte[] buffer = Encoding.UTF8.GetBytes(s); String Text = Encoding.GetEncoding("GBK ").GetString(buffer);//HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8) Response.AddHeader("Content-Disposition", "attachment; filename=" + Text); Response.BinaryWrite(bytes); Response.Flush(); Response.End(); }