关键字是 C# 编译器预定义的保留字。这些关键字不能用作标识符，但是，如果您想使用这些关键字作为标识符，可以在关键字前面加上 @ 字符作为前缀。
在 C# 中，有些标识符在代码的上下文中有特殊的意义，如 get 和 set，这些被称为上下文关键字（contextual keywords）。
下表列出了 C# 中的保留关键字（Reserved Keywords）和上下文关键字（Contextual Keywords）：
|
保留关键字 |
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|
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 |
in (generic |
int |
|
modifier) |
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|
interface |
internal |
is |
lock |
long |
namespace |
new |
|
null |
object |
operator |
out |
out |
override |
params |
|
(generic |
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|
modifier) |
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|
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 |
virtual |
void |
|
volatile |
while |
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|
上下文关键字 |
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|
add |
alias |
ascending |
descending |
dynamic |
from |
get |
|
global |
group |
into |
join |
let |
orderby |
partial |
|
(type) |
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|
partial |
remove |
select |
set |
|||
|
(method) |
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