{"url":"https://npnl.hatenablog.jp/entry/csharp-nullable","blog_url":"https://npnl.hatenablog.jp/","description":"null \u8a31\u5bb9\u578b\u306f\u3001System.Nullable \u69cb\u9020\u4f53\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3089\u3057\u3044\u3002 C#\u3067\u306f\u578b\u306b ? \u3092\u3064\u3051\u308b\u3068Null\u3092\u8a31\u5bb9\u3059\u308b\u3088\u3046\u306b\u3067\u304d\u308b\u3002 int? i = null; // null\u304c\u5165\u308c\u3089\u308c\u308bint\u578b ??\u6f14\u7b97\u5b50 ??\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u3068\u3001\u578b\u304cnull\u3067\u306a\u304b\u3063\u305f\u5834\u5408\u306f\u5de6\u8fba\u3001null\u3060\u3063\u305f\u3089\u53f3\u8fba\u306b\u306a\u308b\u3002 int y = x ?? -1; // x\u304cnull\u3067\u306a\u3044\u306a\u3089x, null\u306a\u3089-1Null\u8a31\u5bb9\u578b\u304cnull\u3060\u3063\u305f\u5834\u5408\u306e\u521d\u671f\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u307f\u305f\u3044\u306a\u610f\u5473\u5408\u3044\u3089\u3057\u3044\u3002 Groovy\u306e\u30a8\u30eb\u30d3\u30b9\u6f14\u7b97\u5b50*1\u307f\u305f\u3044\u306a\u611f\u3058\u3067\u3059\u306d\u3002 HasValue\u30d7\u30ed\u30d1\u30c6\u30a3\u3068Value\u30d7\u30ed\u30d1\u30c6\u30a3 HasValue\u3067\u5024\u304cnul\u2026","version":"1.0","author_url":"https://blog.hatena.ne.jp/fumokmm/","author_name":"fumokmm","width":"100%","type":"rich","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fnpnl.hatenablog.jp%2Fentry%2Fcsharp-nullable\" title=\"C#\u306eNull\u8a31\u5bb9\u578b(Nullable)\u306b\u3064\u3044\u3066 - No Programming, No Life\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"C#\u306eNull\u8a31\u5bb9\u578b(Nullable)\u306b\u3064\u3044\u3066","provider_url":"https://hatena.blog","published":"2011-10-28 22:34:50","image_url":null,"height":"190","provider_name":"Hatena Blog","blog_title":"No Programming, No Life","categories":["C#","\u6587\u6cd5"]}