Dictionary<>.ContainsKey给出RuntimeBinderException

Question

在.cshtml中，我想检查Directory<int, Object>中是否存在一个键，但是我总是得到一个错误，并且找不到原因。

这是我的密码：

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

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

我所犯的错误：

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

当我只使用.Key或.Value时，它仍然有效。

编辑-解决方案

问题是什么，我不知道，但我已经用以下代码解决了问题：

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

问题是什么，我不知道，但我已经用以下代码解决了问题：

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 2

您是否可以尝试使用TryGetValue而不是ContainsKey，看看它是否有效：

@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);
}