public ActionResult SelectWarehouse(int WarehouseId) { var allWarehouse = goodsService.GetAllWarehouse(); var allWarehouseDTO = allWarehouse.Select(item => new ViewModelWarehouse() { WarehouseName = item.WarehouseName, WarehouseId = item.WarehouseId, CreatTime = item.CreatTime, }).ToList(); var a = allWarehouseDTO.SingleOrDefault(item => item.WarehouseId == WarehouseId); if (a != null) { a.flag = 1; } return(PartialView(allWarehouseDTO)); }