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配列やリストでもIsNullOrEmpty ()を使いたい (C#)

前提

  • Linqは使いたくないものとします。
  • staticクラス内で定義しない(拡張メソッドにしない)場合は、引数のthisを取ってください。

やりたいこと

  • 文字列がnull""でないかでチェックするIsNullOrEmpty ()を、配列やコレクションでも使いたい。

コード

  • 素直に、配列ならLengthで、コレクションならCountでチェックします。
/// <summary>Collection<T>がnullまたは空であれば真</summary>
public static bool IsNullOrEmpty<T> (this ICollection<T> collection) {
    return (collection == null || collection.Count == 0);
}

/// <summary>T []がnullまたは空であれば真</summary>
public static bool IsNullOrEmpty<T> (this T [] array) {
    return (array == null || array.Length == 0);
}
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