public List <SelectListItem> GetShippingMethodSelectList()
        {
            List <SelectListItem> selectListItems = new List <SelectListItem>();

            selectListItems.Add(new SelectListItem()
            {
                Text  = "请选择",
                Value = ""
            });
            _freightService.GetShippingMethodListByCustomerTypeId(null, false)
            .ForEach(p => selectListItems.Add(new SelectListItem()
            {
                Text  = p.ShippingMethodName,
                Value = p.ShippingMethodId.ToString()
            }));
            return(selectListItems);
        }