asp.net-mvc - 将 mvc3 中的下拉列表绑定(bind)到字典？

Question

我在这里想念什么？

View 模型:

public class ViewModel
{
    public IDictionary<int, string> Entities { get; set; }
    public int EntityId { get; set; }
}

Controller :

    public override ActionResult Create(string id)
    {
        ViewModel = new ViewModel();

        IEnumerable<Entity> theEntities = (IEnumerable < Entity >)db.GetEntities();
        model.Entities= theEntities.ToDictionary(x => x.Id, x => x.Name);

        return View(model);            
    }

看法:

<div class="editor-field">@Html.DropDownListFor(model => model.EntityId,
    new SelectList(Model.Entities, "Id", "Name"))</div>
</div>

错误:

DataBinding: 'System.Collections.Generic.KeyValuePair....does not contain a property with the name 'Id'

Answer 1

KeyValuePair有属性 Key和 Value .你最好声明Entities作为类型 IEnumerable<Entity> ，那么您的 View 将按原样工作:

public class ViewModel
{
    public IEnumerable<Entity> Entities { get; set; }
    public int EntityId { get; set; }
}

或者，如果您确实需要使用 Dictionary<>，请更改您的 View :

<div class="editor-field">
    @Html.DropDownListFor(model => model.EntityId, new SelectList(Model.Entities, "Key", "Value"))
</div>