[英]Dictionary<>.ContainsKey gives RuntimeBinderException
在.cshtml中,我想检查Directory<int, Object>
是否存在键Directory<int, Object>
但是我总是收到错误,找不到原因。
这是我的代码:
@foreach (KeyValuePair<int, int> weekAndYear in @ViewBag.WeekAndYears)
{
int key = int.Parse(weekAndYear.Value + "" + weekAndYear.Key);
bool exist = ViewBag.Menus.ContainsKey(key);
}
我得到的错误:
The best overloaded method match for System.Collections.Generic.Dictionary<int,Object>.this[int] has some invalid arguments
当我仅使用.Key或.Value时,它仍然有效。
编辑-解决方案
问题是什么,我不知道,但是我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);
}
您是否可以尝试使用TryGetValue而不是ContainsKey来查看它是否有效:
@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);
}
问题是什么,我不知道,但是我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);
}
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