模型的ASP.NET MVC结合嵌套集合 [英] Model binding nested collections in ASP.NET MVC

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本文介绍了模型的ASP.NET MVC结合嵌套集合的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我使用的是史蒂夫·桑德森的<一个href=\"http://blog.stevensanderson.com/2010/01/28/editing-a-variable-length-list-aspnet-mvc-2-style/\">BeginCollectionItem在ASP.NET MVC 2帮手模型绑定，如果项目的集合。

这工作得很好，只要藏品的模型不包含另一个集合。

我有这样一个模型：

- 产品搜索
--Variants结果
--- IncludedAttributes

每当我渲染和模型结合的变体集合，它的工作原理jusst罚款。但随着IncludedAttributes收藏，我无法使用BeginCollectionItem帮手，因为ID和名称值不会兑现的ID和名称值是因为它产生的是父变：

 ＆LT; DIV CLASS =变种＆GT;
    ＆LT;输入类型=隐藏值=bbd4fdd4-fa22-49f9-8a5e-3ff7e2942126自动完成=关闭NAME =Variants.index＆GT;
    ＆LT;输入类型=隐藏值=0NAME =变体bbd4fdd4-fa22-49f9-8a5e-3ff7e2942126] .SlotAmountID =Variants_bbd4fdd4-fa22-49f9-8a5e-3ff7e2942126__SlotAmount＆GT;
    ＆LT;表类=包含的属性＆GT;
        ＆LT;输入类型=隐藏值=0NAME =Variants.IncludedAttributes [c5989db5-b1e1-485b-b09d-a9e50dd1d2cb] .IDID =Variants_IncludedAttributes_c5989db5-b1e1-485b-b09d-a9e50dd1d2cb__Id级=属性-id＆GT;
        ＆所述; TR＆GT;
            ＆所述; TD＆GT;
                ＆LT;输入类型=隐藏值=0NAME =Variants.IncludedAttributes [c5989db5-b1e1-485b-b09d-a9e50dd1d2cb] .IDID =Variants_IncludedAttributes_c5989db5-b1e1-485b-b09d-a9e50dd1d2cb__Id级=属性-id＆GT;
            ＆LT; / TD＆GT;
        ＆LT; / TR＆GT;
    ＆LT; /表＆gt;
＆LT; / DIV＆GT;

如果你看一下表中的第一个隐藏字段的名称，它是Variants.IncludedAttributes - 它应该是变体bbd4fdd4-fa22-49f9-8a5e-3ff7e2942126] .IncludedAttributes [...] ...

这是因为当我打电话BeginCollectionItem第二次（在IncludedAttributes集合）也给了没有关于它的项目指标值信息的父变体。

我的code呈现一个Variant看起来是这样的：

 ＆LT; DIV CLASS =产品变圆的内容盒grid_6数据-ID =＆LT;％：Model.AttributeType.Id％＆GT;＆GT;
    ＆LT; H2＆GT;＆LT;％：Model.AttributeType.AttributeTypeName％GT;＆LT; / H＆GT;
    ＆LT; DIV CLASS =框内容＆GT;
    ＆LT;使用（Html.BeginCollectionItem（变））{％GT％;        ＆LT; DIV CLASS =插槽金额＆GT;
            ＆LT;标签类=内联为=slotAmountSelectList＆GT;＆LT;％：Text.amountOfThisVariant％＆GT;：＆LT; /标签＆gt;
            ＆LT;选择一个id =slotAmountSelectList＆GT;＆LT;期权价值=1＆GT; 1＆LT; /选项＆GT;＆LT;期权价值=2＆GT; 2＆LT; /选项＆GT;＆LT; /选择＆GT;
        ＆LT; / DIV＆GT;        ＆LT; DIV CLASS =增加值＆GT;
            ＆LT;标签类=内联为=txtProductAttributeSearch＆GT;＆LT;％：Text.addVariantItems％＆GT;：＆LT; /标签＆gt;
            ＆LT;输入类型=文本ID =txtProductAttributeSearch级=产品属性搜索/＆GT;＆LT;跨度＆GT;＆LT;％：Text.or％GT; ＆LT;一类=选择 - 从列表链接的href =＃选择 - 从列表数据-ID =＆LT;％：Model.AttributeType.Id％＆GT;＆GT;＆LT;％：文本。 selectFromList.ToLowerInvariant（）％GT;＆下; / A＆GT;＆下; /跨度＆GT;
            ＆LT; DIV CLASS =清除＆GT;＆LT; / DIV＆GT;
        ＆LT; / DIV＆GT;
        ＆所述;％：Html.HiddenFor（M =＆GT; m.SlotAmount）％GT;        ＆LT; DIV CLASS =包含的属性＆GT;
            ＆LT;表＆gt;
                ＆LT;＆THEAD GT;
                    ＆所述; TR＆GT;
                        百分位＆GT;＆LT;％：Text.name％GT;＆LT; /第i
                        百分位风格=宽度：80px;＆GT;＆LT;％：Text.price％GT;＆LT; /第i
                        百分位＆GT;＆LT;％：Text.shipping％GT;＆LT; /第i
                        百分位风格=宽度：90像素;＆GT;＆LT;％：Text.image％GT;＆LT; /第i
                    ＆LT; / TR＆GT;
                ＆LT; / THEAD＆GT;
                ＆LT;＆TBODY GT;
                    ＆LT;％的for（int i = 0; I＆LT; Model.IncludedAttributes.Count;我++）{％GT;
                        ＆LT; TR＆GT;＆LT;％：Html.EditorFor（M = GT; m.IncludedAttributes [I]）％GT;＆LT; / TR＆GT;
                    ＆LT;％}％GT;
                ＆LT; / TBODY＆GT;
            ＆LT; /表＆gt;
        ＆LT; / DIV＆GT;    ＆LT;％}％GT;
    ＆LT; / DIV＆GT;
＆LT; / DIV＆GT;

而code为渲染IncludedAttribute：

 ＆LT;％使用（Html.BeginCollectionItem（Variants.IncludedAttributes））{％GT;
    ＆所述; TD＆GT;
        ＆LT;％：Model.AttributeName％GT;
        ＆LT;％：Html.HiddenFor（M = GT; m.Id，新{@class =属性ID}）％GT;
        ＆所述;％：Html.HiddenFor（M =＆GT; m.ProductAttributeTypeId）％GT;
    ＆LT; / TD＆GT;
    ＆LT; TD＆GT;＆LT;％：Model.Price.ToCurrencyString（）％GT;＆LT; / TD＆GT;
    ＆所述; TD＆GT;＆下;％：Html.DropDownListFor（M =＆GT; m.RequiredShippingTypeId，AppData.GetShippingTypesSelectListItems（Model.RequiredShippingTypeId））％＆GT;＆下; / TD＆GT;
    ＆所述; TD＆GT;＆下;％：Model.ImageId％GT;＆下; / TD＆GT;
＆LT;％}％GT;

解决方案

当你正在使用MVC 2和EditorFor，你不应该需要用史蒂夫的解决方案，我相信这是只是一个变通的MVC 1.你应该只是能够做这样的事情：

 ＆LT;％的for（int i = 0; I＆LT; Model.Variants.Count;我++）{％GT;
    ＆LT;％= Html.DisplayFor（M = GT; m.Variants [I] .AttributeType.AttributeTypeName）％GT;
    ＆LT;％为（INT J = 0; J＆LT; Model.Variants [I] .IncludedAttributes.Count; J ++）{％GT;
        ＆LT;％= Html.EditorFor（M = GT; m.Variants [I] .IncludedAttributes [J]）％GT;
    ＆LT;％}％GT;
＆LT;％}％GT;

请注意，使用索引的... [I] ... [J] ...是重要的，是MVC怎么会知道如何渲染ID和姓名正确。

I'm using Steve Sanderson's BeginCollectionItem helper with ASP.NET MVC 2 to model bind a collection if items.

That works fine, as long as the Model of the collection items does not contain another collection.

I have a model like this:

-Product
--Variants
---IncludedAttributes

Whenever I render and model bind the Variants collection, it works jusst fine. But with the IncludedAttributes collection, I cannot use the BeginCollectionItem helper because the id and names value won't honor the id and names value that was produced for it's parent Variant:

<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>

If you look at the name of the first hidden field inside the table, it is Variants.IncludedAttributes - where it should have been Variants[bbd4fdd4-fa22-49f9-8a5e-3ff7e2942126].IncludedAttributes[...]...

That is because when I call BeginCollectionItem the second time (On the IncludedAttributes collection) there's given no information about the item index value of it's parent Variant.

My code for rendering a Variant looks like this:

<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>

And the code for rendering an IncludedAttribute:

<% 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>
<% } %>

解决方案

As you are using MVC 2 and EditorFor, you shouldn't need to use Steve's solution, which I believe is just a work around for MVC 1. You should just be able to do something like:

<% 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]) %>
    <% } %>
<% } %>

Please note that the use of the indexes ...[i]...[j]... is important and is how MVC will know how to render the Id's and names correctly.

这篇关于模型的ASP.NET MVC结合嵌套集合的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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