c# – 减去两个ViewBag值

概述不确定这是否是正确的方法.但是,我在视图中有两个文本框,由控制器中的Viewbag填充.它们是int值.一个值是库存单位数(Viewbag.stock),另一个是订购单位数(Viewbag.ordered).我有第三个文本框,我想显示Viewbag.Stock的值 – Viewbag.Ordered. 我尝试在控制器中执行此 *** 作,但这并没有带来结果.我也试过在文本框的值中这样做,这也没有用. 这是 不确定这是否是正确的方法.但是,我在视图中有两个文本框,由控制器中的VIEwbag填充.它们是int值.一个值是库存单位数(VIEwbag.stock),另一个是订购单位数(VIEwbag.ordered).我有第三个文本框,我想显示VIEwbag.Stock的值 – VIEwbag.Ordered.

我尝试在控制器中执行此 *** 作,但这并没有带来结果.我也试过在文本框的值中这样做,这也没有用.

这是我尝试完成此任务的第一种方式

模型

public int? OnHand { get; set; }        public int? UnitsOrdered { get; set; }

调节器

VIEwBag.Stock = r.FirstOrDefault().OnHand;        VIEwBag.Ordered = r.FirstOrDefault().UnitsOrdered;        VIEwBag.Total = VIEwBag.Stock - VIEwBag.Ordered;

视图

<div >        @HTML.LabelFor(model => model.UnitsOrdered,(string)"Units On Hand ",HTMLAttributes: new { @class = "control-label col-md-2" })        <div >                          @HTML.TextBox("OnHand",null,new { @class = "form-control",Value = VIEwBag.Stock,@Readonly = "Readonly" })        </div>    </div>    <div >        @HTML.LabelFor(model => model.UnitsOrdered,(string)"Number of Units Ordered",HTMLAttributes: new { @class = "control-label col-md-2" })        <div >            @HTML.EditorFor(model => model.UnitsOrdered,new { HTMLAttributes = new { @class = "form-control",@Readonly = "Readonly" } })            @VIEwBag.MyCountIntro @VIEwBag.MyCount            @HTML.ValIDationMessageFor(model => model.UnitsOrdered,"",new { @class = "text-danger" })        </div>    </div>            <div >            @HTML.TextBox("Remaining",Value = VIEwBag.Total,@Readonly = "Readonly" })            </div>

在上面的场景中,VIEwbag.Stock是60.VIEwbag.Ordered是2.VIEwbag.Total应该是58.但相反,它是空白

我也尝试在视图中计算它本身.这也产生了空白.

<div >            @HTML.TextBox("Remaining",Value = VIEwBag.Stock - VIEwbag.Ordered,@Readonly = "Readonly" })        </div>

解决方法 VIEwBag本身会将值视为对象.在进行计算之前,您应该将该对象强制转换为适当的类型.

VIEwBag.Total =(int)VIEwBag.Stock – (int)VIEwBag.Ordered;

总结

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