{"categories":["\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u30fc"],"author_name":"unibon","version":"1.0","image_url":null,"url":"https://unibon.hatenadiary.org/entry/20080416/p7","published":"2008-04-16 00:00:06","type":"rich","blog_title":"unibon\u306e\u65e5\u8a18","blog_url":"https://unibon.hatenadiary.org/","provider_name":"Hatena Blog","height":"190","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Funibon.hatenadiary.org%2Fentry%2F20080416%2Fp7\" title=\"C# \u306e Nullable \u306e\u7cde\u4ed5\u69d8 - unibon\u306e\u65e5\u8a18\" 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# \u306e Nullable \u306e\u7cde\u4ed5\u69d8","width":"100%","provider_url":"https://hatena.blog","author_url":"https://blog.hatena.ne.jp/unibon/","description":"id:unibon:20080402:p2 \u306e\u7d9a\u304d\u3002 \u4eca\u65e5\u306f\u3001\u3053\u306e\u4ed5\u69d8\u3092\u5fd8\u308c\u3066\u3044\u3066\u30d0\u30b0\u3092\u4f5c\u3063\u3066\u3057\u307e\u3044\u30cf\u30de\u3063\u305f\u3002 \u306a\u3093\u3067\u3053\u3093\u306a\u5909\u306a\u4ed5\u69d8\u306a\u3093\u3060\u308d\u3046\uff1f \u3053\u308c\u3092\u56de\u907f\u3059\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u306e\uff1f Nullable<int> x = null; if ((int) x == 0) { Console.WriteLine(\"true\"); } else { Console.WriteLine(\"false\"); } \u3068\u3059\u308b\u3068 InvalidOperationException \u306f\u51fa\u3066\u304f\u308c\u308b\u3002 Nullable<int> x = null; if (x.Value == 0) { Console.WriteLi\u2026"}