{"url":"https://potisan-programming-memo.hatenablog.jp/entry/2026/08/30/191820","author_name":"potisan","title":"C# IEnumerable<T>\u306e\u500b\u6570\u30ab\u30a6\u30f3\u30c8\u306fIReadOnlyCollection<T>\u3092\u5b9f\u88c5\u3057\u305f\u3089\u5c11\u3057\u65e9\u3044\u304b\u3082\u3057\u308c\u306a\u3044","blog_url":"https://potisan-programming-memo.hatenablog.jp/","description":"C#\u306b\u306f\u5217\u6319(GetEnumerator\u30e1\u30bd\u30c3\u30c9)\u3060\u3051\u5bfe\u5fdc\u3059\u308bIEnumerable<T>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3068Count\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u3082\u5bfe\u5fdc\u3059\u308bIReadOnlyCollection<T>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304c\u5b58\u5728\u3057\u307e\u3059\u3002\u500b\u6570\u8868\u793a\u7b49\u3067Count()LINQ\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u5834\u5408\u3001\u7d50\u679c\u3092\u6368\u3066\u308bIReadOnlyCollection<T>\u3092\u5b9f\u88c5\u3057\u305f\u65b9\u304c\u5c11\u3057\u3060\u3051\u65e9\u304f\u306a\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002 \u6ce8\u610f\u70b9\u306fIReadOnlyCollection<T>.Count\u306f\u624b\u52d5\u3067Count()LINQ\u30e1\u30bd\u30c3\u30c9\u3068\u7f6e\u304d\u63db\u3048\u308b\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u3067\u3059\u3002ICollection<T>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u7b49\u3092\u5b9f\u88c5\u3057\u3066\u3044\u308c\u3070Count()LINQ\u30e1\u30bd\u30c3\u30c9\u5185\u2026","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fpotisan-programming-memo.hatenablog.jp%2Fentry%2F2026%2F08%2F30%2F191820\" title=\"C# IEnumerable&lt;T&gt;\u306e\u500b\u6570\u30ab\u30a6\u30f3\u30c8\u306fIReadOnlyCollection&lt;T&gt;\u3092\u5b9f\u88c5\u3057\u305f\u3089\u5c11\u3057\u65e9\u3044\u304b\u3082\u3057\u308c\u306a\u3044 - potisan\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30e1\u30e2\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_url":"https://blog.hatena.ne.jp/potisan/","width":"100%","provider_name":"Hatena Blog","published":"2026-08-30 19:18:20","image_url":null,"height":"190","categories":["C#"],"type":"rich","provider_url":"https://hatena.blog","version":"1.0","blog_title":"potisan\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30e1\u30e2"}