尝试按照文档进行操作，但我无法使其工作。有一个带有密钥字符串的 KeyedCollection。
如何在 KeyedCollection 中使字符串键不区分大小写？
在 Dictionary 上，可以只在 ctor 中传递 StringComparer.OrdinalIgnoreCase。
private static WordDefKeyed wordDefKeyed = new WordDefKeyed(StringComparer.OrdinalIgnoreCase); // this fails
public class WordDefKeyed : KeyedCollection<string, WordDef>
{
// The parameterless constructor of the base class creates a
// KeyedCollection with an internal dictionary. For this code
// example, no other constructors are exposed.
//
public WordDefKeyed() : base() { }
public WordDefKeyed(IEqualityComparer<string> comparer)
: base(comparer)
{
// what do I do here???????
}
// This is the only method that absolutely must be overridden,
// because without it the KeyedCollection cannot extract the
// keys from the items. The input parameter type is the
// second generic type argument, in this case OrderItem, and
// the return value type is the first generic type argument,
// in this case int.
//
protected override string GetKeyForItem(WordDef item)
{
// In this example, the key is the part number.
return item.Word;
}
}
private static Dictionary<string, int> stemDef = new Dictionary<string, int(StringComparer.OrdinalIgnoreCase); // this works this is what I want for KeyedCollection