将IOrderedEnumerable<KeyValuePair<string,int>>转换为字典<string,int>

我在跟踪 answer to another question

// itemCounter is a Dictionary<string, int>, and I only want to keep
// key/value pairs with the top maxAllowed values
if (itemCounter.Count > maxAllowed) {
    IEnumerable<KeyValuePair<string, int>> sortedDict =
        from entry in itemCounter orderby entry.Value descending select entry;
    sortedDict = sortedDict.Take(maxAllowed);
    itemCounter = sortedDict.ToDictionary<string, int>(/* what do I do here? */);
}

Visual Studio正在请求参数 Func<string, int> keySelector . 我试着在网上找到几个半相关的例子,然后把它们放进去 k => k.Key ,但这会导致编译器错误:

'System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string,int>>' 不包含“ToDictionary”和“best”的定义 'System.Linq.Enumerable.ToDictionary<TSource,TKey>(System.Collections.Generic.IEnumerable<TSource>, System.Func<TSource,TKey>)' 有一些无效参数