asp.net-mvc – ASP.NET MVC中的模型绑定嵌套集合

我正在使用Steve Sanderson的 BeginCollectionItem helper和ASP.NET MVC 2模拟绑定项目的集合.

只要集合项的模型不包含其他集合,这样就可以了.

我有这样的模型：

-产品
–Variants
— IncludedAttributes

每当我渲染和模型绑定Variants集合时,它都可以正常工作.但是使用IncludedAttributes集合,我无法使用BeginCollectionItem帮助器,因为id和names值将不会遵循为其父Variant生成的id和names值：

<div class="variant">
    <input type="hidden" value="bbd4fdd4-fa22-49f9-8a5e-3ff7e2942126" autocomplete="off" name="Variants.index">
    <input type="hidden" value="0" name="Variants[bbd4fdd4-fa22-49f9-8a5e-3ff7e2942126].SlotAmount" id="Variants_bbd4fdd4-fa22-49f9-8a5e-3ff7e2942126__SlotAmount">
    <table class="included-attributes">
        <input type="hidden" value="0" name="Variants.IncludedAttributes[c5989db5-b1e1-485b-b09d-a9e50dd1d2cb].Id" id="Variants_IncludedAttributes_c5989db5-b1e1-485b-b09d-a9e50dd1d2cb__Id" class="attribute-id">
        <tr>
            <td>
                <input type="hidden" value="0" name="Variants.IncludedAttributes[c5989db5-b1e1-485b-b09d-a9e50dd1d2cb].Id" id="Variants_IncludedAttributes_c5989db5-b1e1-485b-b09d-a9e50dd1d2cb__Id" class="attribute-id">
            </td>
        </tr>
    </table>
</div>

如果你查看表格中第一个隐藏字段的名称,它就是Variants.IncludedAttributes – 它应该是Variants [bbd4fdd4-fa22-49f9-8a5e-3ff7e2942126] .IncludedAttributes […] …

这是因为当我第二次调用BeginCollectionItem时(在IncludedAttributes集合上),没有给出关于它的父Variant的项索引值的信息.

我渲染Variant的代码如下所示：

<div class="product-variant round-content-box grid_6" data-id="<%: Model.AttributeType.Id %>">
    <h2><%: Model.AttributeType.AttributeTypeName %></h2>
    <div class="box-content">
    <% using (Html.BeginCollectionItem("Variants")) { %>

        <div class="slot-amount">
            <label class="inline" for="slotAmountSelectList"><%: Text.amountOfThisVariant %>:</label>
            <select id="slotAmountSelectList"><option value="1">1</option><option value="2">2</option></select>
        </div>

        <div class="add-values">
            <label class="inline" for="txtProductAttributeSearch"><%: Text.addVariantItems %>:</label>
            <input type="text" id="txtProductAttributeSearch" class="product-attribute-search" /><span><%: Text.or %> <a class="select-from-list-link" href="#select-from-list" data-id="<%: Model.AttributeType.Id %>"><%: Text.selectFromList.ToLowerInvariant() %></a></span>
            <div class="clear"></div>
        </div>
        <%: Html.HiddenFor(m=>m.SlotAmount) %>

        <div class="included-attributes">
            <table>
                <thead>
                    <tr>
                        <th><%: Text.name %></th>
                        <th style="width: 80px;"><%: Text.price %></th>
                        <th><%: Text.shipping %></th>
                        <th style="width: 90px;"><%: Text.image %></th>
                    </tr>
                </thead>
                <tbody>
                    <% for (int i = 0; i < Model.IncludedAttributes.Count; i++) { %>
                        <tr><%: Html.EditorFor(m => m.IncludedAttributes[i]) %></tr>
                    <% } %>
                </tbody>
            </table>
        </div>

    <% } %>
    </div>
</div>

以及用于呈现IncludedAttribute的代码：

<% using (Html.BeginCollectionItem("Variants.IncludedAttributes")) { %>
    <td>
        <%: Model.AttributeName %>
        <%: Html.HiddenFor(m => m.Id,new { @class = "attribute-id" })%>
        <%: Html.HiddenFor(m => m.ProductAttributeTypeId) %>
    </td>
    <td><%: Model.Price.ToCurrencyString() %></td>
    <td><%: Html.DropDownListFor(m => m.RequiredShippingTypeId,AppData.GetShippingTypesSelectListItems(Model.RequiredShippingTypeId)) %></td>
    <td><%: Model.ImageId %></td>
<% } %>

解决方法

当你使用MVC 2和EditorFor时,你不应该使用Steve的解决方案,我认为这只是解决MVC 1的问题.你应该能够做到这样的事情：

<% for (int i = 0; i < Model.Variants.Count; i++) { %>
    <%= Html.DisplayFor(m => m.Variants[i].AttributeType.AttributeTypeName) %>
    <% for (int j = 0; j < Model.Variants[i].IncludedAttributes.Count; j++) { %>
        <%= Html.EditorFor(m => m.Variants[i].IncludedAttributes[j]) %>
    <% } %>
<% } %>

请注意,使用索引… [i] … [j] …很重要,MVC将如何正确地呈现Id和名称.