Skip to main content

Keywords in C#

Keywords in C# Explained

Keywords in C# are the predefined set of reserved words that have special meaning for the compiler. So the keywords cannot be used as identifiers such as variable name, class name, etc. in applications.

 Keywords as Variable Names

 In case you want to use Keywords as variable names (identifiers), then you need to include @ as a prefix for your variable names. For example, @switch is a valid identifier but the switch is not because it’s a keyword and having a special meaning for the compiler.

 The following code example shows how to use the reserved keywords as variable names by including @ as a prefix.

 using System;

namespace CsharpnaijaTutorial

{

    public class @switch

    {

        public int @case;

    }

    class Program

    {

        static void Main(string[] args)

        {

            @switch p1 = new @switch

            {

                @case = 20

            };

            Console.WriteLine("Age: " + p1.@case);

            Console.WriteLine("Press Enter Key to Exit..");

            Console.ReadLine();

        }

    }

}

If we observe above code example, we will see that we used a switch keyword as a variable name (@switch) by including @ as a prefix.

Different types of Keywords in C#

In c#, Keywords are differentiated as two types, those are

a)     Reserve Keywords

b)    Contextual Keywords

Reserved keywords

The table below, lists the available reserved keywords in the C#.

 

abstract

bool

continue

decimal

default

event

explicit

extern

char

checked

class

const

break

as

base

delegate

is

lock

long

num

byte

case

catch

false

finally

fixed

float

for

as

foreach

goto

if

implicit

in

int

interface

internal

do

double

else

namespace

new

null

object

operator

out

override

params

private

protected

public

readonly

sealed

short

sizeof

ref

return

sbyte

stackalloc

static

string

struct

void

volatile

while

true

try

switch

this

throw

unchecked

unsafe

ushort

using

using static

virtual

typeof

uint

ulong

out (generic modifier)

Contextual keywords in C#

Contextual keywords can be used as an identifier in a limited program context and that can be outside of the context.

 

Generally, whenever the new keywords are added to the C# language, those are treated as Contextual keywords in order to avoid the breaking of C# programs which we written in older versions.

 

The table shows the lists of available Contextual Keywords in C#.

 

add

alias

async

await

dynamic

from

get

orderby

ascending

decending

group

into

join

let

nameof

global

partial

set

remove

select

value

var

when

Where

yield

 

 


Labels:
Location: Abuja, Nigeria

Comments

Post a Comment

Popular posts from this blog

Collections in C#

Collections in C# In our previous article , we have learned about how we can use arrays in C#. Arrays in programming are used to group a set of related objects. So one could create an array or a set of Integers, which could be accessed via one variable name. What is Collections in C#? Collections are similar to Arrays, it provides a more flexible way of working with a group of objects. In arrays, you would have noticed that you need to define the number of elements in an array beforehand. This had to be done when the array was declared. But in a collection, you don't need to define the size of the collection beforehand. You can add elements or even remove elements from the collection at any point of time. This article will focus on how we can work with the different collections available in C#. There are three distinct collection types in C#: standard generic concurrent The standard collections are found under the System.Collections. They do not store elemen...
Post a Comment
Read more

The String.Join Method in C# Explained

The String.Join Method in C#   The string.Join concatenates the elements of a specified array or the members of a collection, using the specified separator between each element or member. Overloads of string.Join Method Description Join(Char, Object[]) Concatenates the string representations of an array of objects, using the specified separator between each member. Join(Char, String[]) Concatenates an array of strings, using the specified separator between each member. Join(String, IEnumerable<String>) Concatenates the members of a constructed IEnumerable<T> collection of type String, using the specified separator between each member. Join(String, Object[]) Concatenates the elements of an object array, using the specified separator between each element. Join(String, String[]) Concatenates all the elements of a string array, usi...
Post a Comment
Read more

System.IO Namesapce in C#

  System.IO Namesapce in C# A  file  is a collection of data stored in a disk with a specific name and a directory path. When a file is opened for reading or writing, it becomes a  stream . The stream is basically the sequence of bytes passing through the communication path. There are two main streams: the  input stream  and the  output stream . The  input stream  is used for reading data from file (read operation) and the  output stream  is used for writing into the file (write operation). From the above definition of file, the C# provides a namespace that enable us to manipulate file in C# called System.IO.   System.IO  is a  namespace  and it contains a standard IO (input/output) types such as classes , structures , enumerations , and  delegates  to perform a read/write operations on different sources like file, memory, network, etc.   System.IO Classes The table below shows differen...
Post a Comment
Read more