C# Keywords

Introduction

C# is rich in features and keywords which helps to make the language strong and versatile. Keywords are predefined sets of reserved words that have a special meaning that is known to the compiler. These keywords have special significance so that we cannot use them as identifiers for class name, variable name, and interface name. In this blog, you will learn about C# keywords.

C# Keywords List

List of Reserved Keywords is given below table which is available in C# Programming language,

using	as	finally	sbyte
int	is	fixed	sealed
char	abstract	foreach	sizeof
float	base	goto	typeof
double	case	return	stackalloc
short	try	implicity	struct
long	catch	in	switch
string	checked	internal	throw
true	class	interface	throw
false	const	lock	ulong
static	decimal	namespace	unchecked
this	enum	new	unsafe
byte	default	null	ushort
bool	private	object	virtual
break	protected	operator	void
continue	public	out	volatile
if	delegate	override	extern
else	do	params	using static
while	event	readonly
for	explict	ref

C# Keywords Categorized with their types or groups

Namespace Keywords	using, operator, extern alias
Type Keywords	string, int, long, bool, byte, char, class, decimal, double, enum, float, sbyte, short, struct, uint, ulong, ushort
Operator Keywords	is, await, as, new, sizeof, typeof, checked, unchecked, stackalloc
Statement Keywords	if, else, switch, case, do, for, foreach, in, while, break, continue, default, goto, return, yield, throw, try, catch, finally, checked, unchecked, fixed, lock
Literal Keywords	null, false, true, value, void
Modifier Keywords	public, private, protected, internal, abstract, async, const, event, extern, new, override, partial, readonly, sealed, static, unsafe, virtual, volatile
Method Parameter Keyword	params, ref, out
Access Keywords	base, this
Contextual Keywords	add, var, dynamic, global, set, value
Query Keywords	from, where, select, group, into, orderby, join, let, in, on, equals, by, ascending, descending

Essential C# Keywords

Concept	Description
public	Accessible from any code, anywhere in the project.
private	Accessible only within the same class or struct.
protected	Accessible within the same class and derived classes.
internal	Accessible within the same assembly.
protected internal	Accessible within its own assembly or by derived classes.
class	Defines a class, a blueprint for creating objects.
interface	Declares a contract that classes can implement.
struct	Creates a value type holding data directly.
enum	Defines an enumeration, a set of named constants.
record	Defines an immutable data class.
string	Represents text data.
int	A 32-bit integer.
bool	Represents a Boolean value (true or false).
double	A double-precision floating-point number.
decimal	Used for high-precision decimal numbers.
var	Allows the compiler to infer the type of a variable.
static	Belongs to the type itself rather than an instance.
virtual	Allows a method to be overridden in a derived class.
override	Provides a new implementation of a virtual method.
abstract	Must be implemented by derived classes.
async	Marks a method as asynchronous.
await	Waits for the completion of an asynchronous operation.
if, else	Executes code based on a conditional expression.
switch	Allows multiple branches of execution.
for, foreach	Used for iterating over collections or repeating code.
while, do	Executes a block of code repeatedly.
break	Exits a loop or a switch statement.
continue	Skips the rest of the current loop iteration.
return	Exits a method and optionally returns a value.
throw	Throws an exception.
try, catch, finally	Surrounds code that might throw an exception.
null	Represents the absence of a value.
default	Provides the default value of a type.
using	Ensures that resources are properly disposed of.
is	Checks if an object is of a specific type.
as	Safely converts an object to a specific type.
new()	Instantiates a new object.
nameof	Retrieves the name of a variable or type as a string.
when	Adds a condition to pattern matching.
fixed	Pins a pointer in memory to prevent garbage collection from moving it.
unsafe	Allows code that uses pointers.
stackalloc	Allocates memory on the stack.
volatile	Indicates that a field may be modified by multiple threads.
value	Refers to the value being assigned in a property setter.
get	Defines a property accessor that retrieves the value.
set	Defines a property mutator that sets the value.
yield	Used in iterator methods to provide a value to the enumerator object.
partial	Allows a class or method to be defined in multiple files.
where	Specifies constraints on generic type parameters.

Summary

We cannot use C# standard keywords as identifiers for class names, variable names, and interface names. If you want to learn more about C# keywords, you can refer Essential C# Keywords

If you have any query/suggestion on C# keywords, please leave your thoughts in the comment section below.

Thanks for reading and I hope you like it.