C# 编程/关键字/default

default 关键字可以在switch 语句或泛型代码中使用：

• switch 语句：指定默认标签。
• 泛型代码：指定类型参数的默认值。对于引用类型，这将是 null，对于值类型，这将是零。

参考文献

C# 关键字
abstract as base bool break byte case catch char checked class const continue decimal default delegate do double else enum event explicit extern false finally fixed float for foreach goto if implicit in int interface internal is lock long namespace new null object operator out override params private protected public readonly ref return sbyte sealed short sizeof stackalloc static string struct switch this throw true try typeof uint ulong unchecked unsafe ushort using var virtual void volatile while
特殊 C# 标识符（上下文关键字）
add alias async await dynamic get global nameof partial remove set value when where yield
上下文关键字（在查询中使用）
ascending by descending equals from group in into join let on orderby select where