lambda-如何用拉姆達表達式進行篩選

如何用拉姆達表達式進行篩選

如何用拉姆達表達式代替foreach進行結果篩選

ProductModel productmodel = new ProductModel();
 int? prostate_0 = 0;
        int? prostate_1 = 0;
        int? prostate_2 = 0;
        productmodel.Shop = _Shop;
        List<ProductModel> listcount = productmodel.Listcount();
        foreach (ProductModel item in listcount)
        {
            if (item.Pro_stateNum != null)
            {
                switch (item.Pro_state)
                {
                    case 0:{
                            prostate_0 = item.Pro_stateNum;
                        } break;
                    case 1:{
                            prostate_1 = item.Pro_stateNum;
                        } break;
                    case 2:{
                            prostate_2 = item.Pro_stateNum;
                        } break;
                }
            }
        }

最佳回答：

 還可以簡化下
List<ProductModel> listcount = productmodel.Listcount();
->
List<ProductModel> listcount = productmodel.Where(x => x.Pro_stateNum != null).Listcount();

productmodel.ForEach((item) => {
                switch (item.Pro_state)
                {
                    case 0:{
                            prostate_0 = item.Pro_stateNum;
                        } break;
                    case 1:{
                            prostate_1 = item.Pro_stateNum;
                        } break;
                    case 2:{
                            prostate_2 = item.Pro_stateNum;
                        } break;
                }
});