c# - 如何解决警告 : TKey has the same name as the type parameter from outer type

Question

我正在尝试解决编译器警告:

Type parameter 'TKey' has the same name as the type parameter from outer type 'Common.Core.ObservableDictionary<TKey,TValue>' 

这是有问题的代码:

protected class KeyedDictionaryEntryCollection<TKey> : KeyedCollection<TKey, DictionaryEntry> {

        public KeyedDictionaryEntryCollection() {}

        public KeyedDictionaryEntryCollection(IEqualityComparer<TKey> comparer) : base(comparer) {}

        protected override TKey GetKeyForItem(DictionaryEntry entry) {
            return (TKey) entry.Key;
        }
    }

它显示第一个 TKey 是问题。

我该如何解决这个问题？代码工作正常，但我正在努力解决所有编译器警告。

Answer 1

这是因为这是泛型类内部的内部类。编译器警告您，您正在使用与外部类规范相同的名称，这有效地“隐藏”了它。您可以通过消除内部类的规范来删除它，因为不需要它(除非您想引入新的泛型类型):

class ObservableDictionary<TKey,TValue>
{
     // This class already knows about TKey and TValue since it's an inner class in the "outer" generic class
     protected class KeyedDictionaryEntryCollection : KeyedCollection<TKey, DictionaryEntry> 
     {
        // Your existing code, as is...
     }
}