wata_d https://blog.hatena.ne.jp/wata_d/ 閑古鳥 https://www.little-cuckoo.jp/ C# class Program { interface IAnimal { } class Dog : IAnimal { public void say() { Console.WriteLine("ワン"); } } class Cat : IAnimal { } static void Main(string[] args) { IAnimal[] dogs = new IAnimal[1] { new Cat() }; foreach (Dog d in dogs) { d.say(); } } } C#で上記のコードが普通にコンパイルできます。が、dogsの中身はCat型のインスタンスな… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.little-cuckoo.jp%2Fentry%2F20091109%2F1257768233" title="foreachで受け取る型に制限がない? - 閑古鳥" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2009-11-09 21:03:53 rich https://www.little-cuckoo.jp/entry/20091109/1257768233 1.0 100%