C#導出Excel

導出EXCEL是經常用到的功能，之前接觸過，最近又再次用到了，就總結下！
將以下方法寫在Action裏就好。

public ActionResult OutExcel()
        {
            string whereStr = "";
            whereStr += string.Format("***");
            IList<LLM.Model.****> List = BLL.GetModelList(whereStr);
            string strHtml = "<meta http-equiv='content-type' content='application/ms-excel; charset=GB2312'/><table><tr>";
            strHtml += "<td>***</td>" + "<td>***</td>" + "<td>***</td>" + "<td>***</td></td></tr><tr>";
            foreach (LLM.Model.T_Base_Order model in orderList)
            {
                strHtml += "<td>" + model.***+ "</td>";
                strHtml += "<td>" + model.***+ "</td>";
                strHtml += "<td>" + model.***+ "</td>";
                strHtml += "</tr>";
            }
            strHtml += "</table>";
            strHtml = HttpUtility.HtmlDecode(strHtml);//Html解碼
            byte[] b = System.Text.Encoding.Default.GetBytes(strHtml);//字串轉byte陣列
            string filename = "***.xls";//文件名字
            return File(b, "application/ms-excel", filename);//輸出檔案給Client端
        }

比較簡單的比特流轉換Excel方法，通過瀏覽器解碼，簡單好用。