MVC 模型出现错误

Question

我在尝试加载选项卡时遇到错误。

错误

The model item passed into the dictionary is of type 'Mvc5.Models.IndexModel', but this dictionary requires a model item of type 'Mvc5.Models.ORDERMetadata'.

订单控制器

  public ActionResult order()
    {
       IndexModel models = new IndexModel();

        return View(models);
    }

IndexModel.cs

        public class IndexModel
        {
            public ORDERMetadata GeneralTab { get; set; }
            public ORDER_DETAILSMetadata ItemTab { get; set; }
            //public ThirdTabModel ThirdTab { get; set; }

        }

order.cshtml

@model Mvc5.Models.IndexModel

<div id="tabs">
    <ul class="nav nav-tabs">
        <li><a href="#tabs-1">General</a></li>
        <li><a href="#tabs-2">Item</a></li>
        <li><a href="#tabs-3">Total</a></li>
    </ul>


    <div id="tabs-1">
        @{Html.RenderPartial("_Partial_General_Tab", Model.GeneralTab);}  <===== ERRROR HERE!
    </div>

    <div id="tabs-2">
        @{Html.RenderPartial("_Partial_Item_Tab", Model.ItemTab);}
    </div>

    <div id="tabs-3">
        Content for Tab 3 goes here.<br />
        Lorem ipsum dolor sit amet, consectetuer adipiscing elit,
        sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.
    </div>

</div>

_partial_General_Tab.cshtml

@model Mvc5.Models.ORDERMetadata

    @using (Ajax.BeginForm("Edit", "Order",
            new AjaxOptions
            {
                HttpMethod = "POST",
                InsertionMode = InsertionMode.Replace,
                UpdateTargetId = "target"
            }))
    {

        @Html.AntiForgeryToken()
        @Html.ValidationSummary(true)

        Enter model data here....   

        <button id="editorder" type="submit" class="btn btn-default">Save</button>



    }

_Partial_Item_Tab.cshtml

@model Mvc5.Models.ORDER_DETAILSMetadata


    @using (Ajax.BeginForm("Items", "Order",
            new AjaxOptions
            {
                HttpMethod = "POST",
                InsertionMode = InsertionMode.Replace,
                UpdateTargetId = "target"
            }))
    {
        @Html.AntiForgeryToken()
        @Html.ValidationSummary(true)

        Enter model data here....   

        <input type="submit" value="Add" class="btn btn-default" />

    }

Answer 1

这将发生，因为 IndexModel 的 GeneralTab and/or ItemTab 属性是 null（在这种情况下 ViewDataDictionary 通过部分将是IndexModel。确保在将模型传递给视图之前初始化属性。

public ActionResult order()
{
  IndexModel models = new IndexModel();
  models.GeneralTab = new ORDERMetadata();
  models.ItemTab = new ORDER_DETAILSMetadata();
  return View(models);
}

或者在 IndexModel

的无参数构造函数中初始化它们