Dictionary <>。ContainsKey給出RuntimeBinderException

Question

在.cshtml中，我想檢查Directory<int, Object>是否存在鍵Directory<int, Object>但是我總是收到錯誤，找不到原因。

這是我的代碼：

@foreach (KeyValuePair<int, int> weekAndYear in @ViewBag.WeekAndYears)
{
    int key = int.Parse(weekAndYear.Value + "" + weekAndYear.Key);

    bool exist = ViewBag.Menus.ContainsKey(key);
}

我得到的錯誤：

The best overloaded method match for System.Collections.Generic.Dictionary<int,Object>.this[int] has some invalid arguments

當我僅使用.Key或.Value時，它仍然有效。

編輯-解決方案

問題是什么，我不知道，但是我用以下代碼解決了問題：

foreach (KeyValuePair<int, int> weekAndYear in @ViewBag.WeekAndYears)
    {
        int key = int.Parse(weekAndYear.Value + "" + weekAndYear.Key);

        bool exist = ((Dictionary<int, Object>)ViewBag.Menus).ContainsKey(key);
}

Answer 1

您是否可以嘗試使用TryGetValue而不是ContainsKey來查看它是否有效：

@foreach (KeyValuePair<int, int> weekAndYear in @ViewBag.WeekAndYears)
{
    int key = int.Parse(weekAndYear.Value + "" + weekAndYear.Key); 
    Object outValue;
    bool exist = Menus.TryGetValue(key, out outValue);
}

Answer 2

問題是什么，我不知道，但是我用以下代碼解決了問題：

foreach (KeyValuePair<int, int> weekAndYear in @ViewBag.WeekAndYears)
    {
        int key = int.Parse(weekAndYear.Value + "" + weekAndYear.Key);

        bool exist = ((Dictionary<int, Object>)ViewBag.Menus).ContainsKey(key);
}