关键字是保留字。您不能将其用作变量名、常量名等。
在 C# 中，关键字不能用作标识符。但是，如果我们想使用关键字作为标识符，我们可以在关键字前面加上@字符。
下面给出了 C# 编程语言中可用的保留关键字列表：
| abstract | base | as | bool | break | catch | case |
|---|---|---|---|---|---|---|
| byte | char | checked | class | const | continue | decimal |
| private | protected | public | return | readonly | ref | sbyte |
| explicit | extern | false | finally | fixed | float | for |
| foreach | goto | if | implicit | in | in (generic modifier) | int |
| ulong | ushort | unchecked | using | unsafe | virtual | void |
| null | object | operator | out | out (generic modifier) | override | params |
| default | delegate | do | double | else | enum | event |
| sealed | short | sizeof | stackalloc | static | string | struct |
| switch | this | throw | true | try | typeof | uint |
| abstract | base | as | bool | break | catch | case |
| volatile | while |
一些在代码上下文中具有特殊含义的标识符称为上下文关键字。
下面给出了 C# 编程语言中可用的上下文关键字列表：
| add | group | ascending | descending | dynamic | from | get |
|---|---|---|---|---|---|---|
| global | alias | into | join | let | select | set |
| partial (type) | partial(method) | remove | orderby |