public ActionResult ExportExcel()
{
ExcelHelp excel = new ExcelHelp();
DataTable dt = new DataTable("Test");
dt.Columns.Add("姓名", typeof(string));
dt.Columns.Add("性别", typeof(string));
dt.Columns.Add("电话", typeof(string));
dt.Rows.Add("李磊", "男", "15898653259");
dt.Rows.Add("张执先", "男", "19158974563");
dt.Rows.Add("韩志成", "女", "16498653245");
var ms = excel.ExportDataTableToExcel(dt, "MyTest");
return(File(ms.ToArray(), "application/vnd.ms-excel", "导出.xlsx"));
}