.NET EP Plus导出Excel，解决火狐或ie乱码的问题

.NET EP Plus导出Excel，解决火狐或ie乱码的问题  通过流导出在浏览器端，保存在本地。

 using (ExcelPackage package = new ExcelPackage())
            {
                ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("Sheet1");
                //worksheet.Cells[1, 1, 1, 3].Merge = true;
                //worksheet.Cells[1, 1].Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;//水平居中
                //worksheet.Cells[1, 1].Style.Font.Bold = true;//字体为粗体
                //worksheet.Cells[1, 1].Style.Font.Size = 12;//字体大小
                worksheet.Cells[1, 1].Value = "联系方式";
                worksheet.Cells[2, 1].Value = "17777777777";
                worksheet.Cells[3, 1].Value = "15977777777";
                worksheet.Cells[4, 1].Value = "13677777777";
                worksheet.Cells[1, 2].Value = "被催收人";
                worksheet.Cells[2, 2].Value = "周女士";
                worksheet.Cells[3, 2].Value = "张三";
                worksheet.Cells[4, 2].Value = "李四";


                byte[] bytes = package.GetAsByteArray();
                // 清除缓存区流中的所有内容输出
                context.Response.Clear();
                // 设置缓冲输出为true,后台编辑的文件写到内存流中了
                context.Response.Buffer = true;
                // 设置编码格式 ContentEncoding是管字节流到文本的，而Charset是管在浏览器中显示的
                //Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
                //Response.Charset = "UTF-8";

                string userAgent = context.Request.ServerVariables["http_user_agent"].ToLower();

                //如果不是火狐浏览器
                if (userAgent.IndexOf("firefox") == -1)
                {
                    // 将HTTP头添加到输出流，指定默认名
                    context.Response.AddHeader("Content-Disposition", string.Format(@"attachment;filename=""{0}""", HttpUtility.UrlEncode("发送短信模板" + "." + "xlsx", Encoding.UTF8), Encoding.UTF8));
                    //Response.ContentEncoding = System.Text.Encoding.UTF8;
                }
                else
                {
                    // 将HTTP头添加到输出流，指定默认名
                    context.Response.AddHeader("Content-Disposition", string.Format(@"attachment;filename=""{0}""", "发送短信模板" + "." + "xlsx"));
                }

                // 设置输出流的HTTP MIME类型为application/vnd.ms-excel
                context.Response.ContentType = "application/vnd.ms-excel";
                context.Response.AddHeader("Content-Length", bytes.Length.ToString());
                // 将指定的文件写入HTTP内容输出流
                context.Response.OutputStream.Write(bytes, 0, bytes.Length);
                //防止文件名含中文出现乱码而进行编码
                // Response.BinaryWrite(bytes);
                // 向客户端发送当前所有缓冲的输出
                context.Response.Flush();
                // 将当前所有缓冲的输出关闭
                context.Response.Close();
            }