最終更新:2020-04-30 (木) 14:29:20 (1429d)
C♯ 8.0
Top / C♯ 8.0
2019/09
対応
null許容参照型
- ?
- https://docs.microsoft.com/ja-jp/dotnet/csharp/language-reference/builtin-types/nullable-value-types