如何在MVC应用程序的网格视图中使用LINQ语句显示总和

Question

我正在开发MVC应用程序。

我陷入了LINQ语法中。

我希望在父级的索引视图中显示列表项的总和。 请检查下面的代码。

在模型中，我有两个类。

   public class StockAdjustment
            {
                public int Id { get; set; }
                public List<StockAdjustmentItem> StockAdjustmentItems { get; set; }     
                 public int SumOfStockAdjustmentItemQuantity
                {
                get 
           { 
                if (this.StockAdjustmentItems != null)
                {
                return this.StockAdjustmentItems.Sum(s=>s.OriginalQuantity);
                     }
             return 0;
            }
        }
            }

            public class StockAdjustmentItem
            {
                public int Id { get; set; }
                public int OriginalQuantity { get; set; }
                public StockAdjustment StockAdjustment { get; set; }
            }



          public StockAdjustment GetAll(int Id)
            {


                oStockAdjustment = GetStockAdjustmentById(Id);

                var prepo = new ProductRepo();

                oStockAdjustment.StockAdjustmentItems = new List<StockAdjustmentItem>();


                StockAdjustmentItem ai1 = new StockAdjustmentItem();
                ai1.Id = 1 ;
                ai1.OriginalQuantity = 250;
               oStockAdjustment.StockAdjustmentItems.Add(ai1);



                StockAdjustmentItem ai2 = new StockAdjustmentItem();
                ai2.Id = 1;
                ai2.OriginalQuantity = 375;
               oStockAdjustment.StockAdjustmentItems.Add(ai2);

                return oStockAdjustment;

            }

现在我有控制器代码

 public ActionResult Index(string searchContent = "")
        {
            AdjustmentRepo oAdjustmentRepo = new AdjustmentRepo();

            var adjustments = from adjustment in oAdjustmentRepo.GetAll() select adjustment;


            ViewBag.StockAdjustmentList = adjustments;
            return View(adjustments);
        }

这个工作很好...

现在，问题来了，当我尝试在List中显示StockAdjustment时。

我必须在网格的StockAdjustment项的前面显示StockAdjustmentItems的OriginalQuantites的总和。

在上面的Exmaple中，我想在网格的行中显示650（250 + 375）。

  @model IEnumerable<StockWatchServices.DomainClass.StockAdjustment>

      @Html.Grid(Model).Columns(columns => 
        {            
     columns.Add(c=>c.StockAdjustmentItems.Sum( OriginalQuantity ???? Im stuck here... ) 
        }

我应该在这里写些什么？

我可以看到这样的...

Answer 1

在StockAdjustment类上创建仅吸气剂属性

public class StockAdjustment
{
 public int Id { get; set; }
 public List<StockAdjustmentItem> StockAdjustmentItems { get; set; } 
 public int SumOfStockAdjustmentItemQuantity
 {
  get 
  { 
   if (this.StockAdjustmentItems != null)
   {
    return this.StockAdjustmentItems.Sum(s=>s.OriginalQuantity);
   }
   return 0;
 }
}

}

然后在您的Razor视图中：

@Html.Grid(Model).Columns(columns => 
{            
 columns.Add(c => c.SumOfStockAdjustmentItemQuantity) 
}

Answer 2

您可以尝试以下代码：

@Html.Grid(Model).Columns(columns =>
{
    columns.Add(c => c.StockAdjustmentItems.Where(quantity => quantity.OriginalQuantity != null).Sum(sum => sum.OriginalQuantity).ToString());
})