asp.net-mvc – 使用Checkboxes绑定到具有强类型MVC视图的Bools

我正在尝试使用一个相当复杂的模型与我的一个观点,我遇到了严重的麻烦,让它正确绑定.

该模型使用整数键包装一个Dictionary,并将值列为bools列表.

基本上,搜索是在整数表示的项目上进行的,每个项目都有几个搜索项,对于每个项,我们都有一个结果列表.我在页面上显示结果,每个结果旁边都有一个复选框.对于每个结果,用户将通过选中该框来指示他们是否想要通过下一个Action完成某些操作.

此时,复选框显示正确,包括控制器的预设值,但是当我按下表单底部的提交按钮时,出现此错误：

Specified cast is not valid.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidCastException: Specified cast is not valid.

在我看来,与使用字典有关,我被告知这不适合作为模型.我可能不得不改变别的东西,但除非我绝对必须,否则我宁愿不改变.好像在某处可能有一个答案：http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx,或Checkbox list for complex type in asp.net mvc,或How to bind Dictionary type parameter for both GET and POST action on ASP.NET MVC,但我发现那些问题全部写完之后我还没想出来,所以也许有人可以帮我一把.

这是堆栈跟踪的顶部：

[InvalidCastException: Specified cast is not valid.]
   System.Web.Mvc.CollectionHelpers.ReplaceDictionaryImpl(IDictionary`2 dictionary,IEnumerable`1 newContents) +131

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeMethodHandle.InvokeMethod(Object target,Object[] arguments,Signature sig,Boolean constructor) +0
   System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj,Object[] parameters,Object[] arguments) +92
   System.Reflection.RuntimeMethodInfo.Invoke(Object obj,BindingFlags invokeAttr,Binder binder,CultureInfo culture) +108
   System.Reflection.MethodBase.Invoke(Object obj,Object[] parameters) +19
   System.Web.Mvc.CollectionHelpers.ReplaceDictionary(Type keyType,Type valueType,Object dictionary,Object newContents) +178

这是模型：

public class AutoResolveModel {
    public Dictionary<int,List<List<bool>>> SelectedResults { get; set; }

    public AutoResolveModel() {
        SelectedResults = new Dictionary<int,List<List<bool>>>();
    }
}

由于它可能是相关的,这里是ViewBag.iidToData的结构,它保存要显示的结果：

In the controller action:

    var iidToData = new Dictionary<int,List<ItemSearchResult>>();
    ViewBag.iidToData = iidToData;

Elsewhere:

    public class ItemSearchResult {
        public string C { get; set; }
        public string S { get; set; }
        public List<int> Ss { get; set; }
        public List<int> Ks { get; set; }
    }

以下是视图中的一些相关部分,其中变量名称已更改,以保护无辜者：

@model AutoResolveModel

@{
    string machineID;
    Submission subm;
    tblSignatures sig;
    ItemSearchResult result;

    var dc = new CloudDataContext();
}

@using( Html.BeginForm( "MyAction","MyController",new { p = (int?) ViewBag.l },FormMethod.Post ) ) {

    foreach( KeyValuePair<int,List<ItemSearchResult>> kv in ViewBag.iidToData ) {

        <input type="hidden" name="@("SelectedResults[ " + kv.Key + " ].Key")" value="@kv.Key" />

        ID = (
            ...
        ).Single();

        <h3>Inventory Item @ID</h3>

        for(int isr = 0; isr < kv.Value.Count(); isr++) {

            result = kv.Value[ isr ];

            <h4>Searched for @result.S from @result.C</h4>

            <table border="0">
                <tr><th>K</th><th>I</th><th>V</th><th>G</th><th>D</th><th>S</th><th>T</th></tr>
                @for( int i = 0; i < result.Ks.Count(); i++ ) {
                    subm = (
                        ...
                    ).FirstOrDefault();
                    try {
                        sig = (
                            ...
                        ).Single();
                    } catch {
                        sig = null;
                    }

                    if( subm != null && subm.K != 0 ) {

                        <tr>
                            <td>@Html.CheckBoxFor(m => m.SelectedResults[kv.Key][isr][i])</td>
                            <td>@result.Ks[ i ]</td>
                            <td>@subm.i</td>
                            <td>@subm.v</td>
                            <td>@subm.g</td>
                            <td>@subm.d</td>
                            @if( sig != null ) {
                                <td>@sig.S</td>
                                <td>@sig.T</td>
                            } else {
                                <td>N/A</td>
                                <td>N/A</td>
                            }
                        </tr>
                    }
                }
            </table>
        }
    }

    <button type="submit">Search</button>
}