/// <summary>
        /// 查询排序分页
        /// </summary>
        /// <param name="searchString"></param>
        /// <param name="orderByString"></param>
        /// <param name="pageIndex"></param>
        /// <returns></returns>
        // GET: Employees
        public async Task <IActionResult> Index(string searchString, string orderByString, int?pageIndex, string username, string orderByType)
        {
            username = HttpContext.Session.GetString("loginUsername");
            //IQueryable<Employee> employeeIQ = _context.Employee;
            // 查询
            if (!string.IsNullOrEmpty(searchString))
            {
                EmployeeIQ = EmployeesService.SearchEmployee(searchString.Trim());
            }
            // 排序
            if (!string.IsNullOrEmpty(orderByString))
            {
                EmployeeIQ = EmployeesService.OrderByEmployee(orderByString, orderByType);
            }
            EmployeeIndexViewModel employeeIndexModel = await EmployeesService.GetEmployeeIndexModelAsync(pageIndex, username, orderByString, searchString, orderByType);

            return(View(employeeIndexModel));
        }