我在將值綁定到下拉列表時遇到麻煩。模型public class DummyModel{    ...    public int? OptionID { get; set; }    ...}行內(nèi)視圖導致異常@Html.DropDownListFor(model => model.OptionID, new SelectList(ViewBag.AvailableOptions, "ID", "Name"))ViewBag的內(nèi)容?ViewBag.AvailableOptionsCount = 4    [0]: {[3, Average Speed]}    [1]: {[4, Snails pace]}    [2]: {[1, Super Fast]}    [3]: {[2, Super Slow]}生成的異常：System.Web.HttpException：'DataBinding：'System.Collections.Generic.KeyValuePair`2 [[System.Int32，mscorlib，Version = 4.0.0.0，Culture = neutral，PublicKeyToken = b77a5c561934e089]，[System.String，mscorlib，Version = 4.0.0.0，文化=中性，