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C# Keywords
Review keywords from the C# language. Each keyword has a link to an example and a description.
Keywords. The glacier is a harsh place for living creatures. The polar bear seeks refuge in a cave. A visitor to this icy world must find a way to survive.
Keyword list. Like a fire brings warmth to this winter place, a keyword brings meaning to a program. We use keywords to control the program's logic.abstractasascendingasyncawaitbaseboolbreakbytecasecatchcharcheckedclassconstcontinuedecimaldefaultdelegatedescendingdodoubledynamicelseenumequalseventexplicitexternfalsefinallyfixedfloatforforeachfromgetgotogroupifimplicitinintinterfaceinternalisjoinletlocklongnameofnamespacenewnullobjectoperatororderbyoutoverrideparamspartialprivateprotectedpublicreadonlyrefreturnsbytesealedselectsetshortsizeofstackallocstaticstringstructswitchthisthrowtruetrytypeofuintulonguncheckedunsafeushortusingvaluevarvirtualvoidvolatilewhenwherewhileyield
Syntax hints. A question mark can mean a ternary statement, or a nullable type. A period can mean a member access or a floating-point number.[A] (Attribute)// ... (Comment)/* ... */ (Comment)~C (Destructor)# (Directive)_ (Discard name){0} (Format)<T> (Generic){[0] = 1} (Indexer initializer): (Inheritance)=> (Lambda)% (Modulo)? (Nullable)?? (Null coalescing)?. (Null conditional)D (Numeric suffix)$"{x}" (String interpolation)? (Ternary)* (Unsafe)(1, "x") (ValueTuple)@ (Verbatim literal)
Reserved versus contextual. Here is an important part of the syntax of C#. Some terms, like "for," are reserved keywords—we cannot name a variable "int for."
Reserved, continued. Other terms, like "where," are contextual keywords. They have a special meaning in a certain place (like a query expression) but we can name a variable "where."
A final note. For survival in the arctic world, tiny syntax details are less important. The big picture is what matters. Know first the important things like string and int.
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- C# KeyValuePair Examples
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- C# Line Directive
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- C# Math.Max and Math.Min Examples
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- C# Multiply Numbers
- C# namespace Keyword
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- C# Nested Lists: Create 2D List or Jagged List
- C# Nested Switch Statement
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- C# Null String Example
- C# null Keyword
- C# Nullable Examples
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- C# OfType Examples
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- C# Odd and Even Numbers
- C# Bitwise Or
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- C# OutOfMemoryException
- C# OverflowException
- C# Overload Method
- C# Override Method
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- C# Parallel.For Example (Benchmark)
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- C# partial Keyword
- C# Path.ChangeExtension
- C# Path Exists Example
- C# Path.GetExtension: File Extension
- C# Path.GetRandomFileName Method
- C# Pragma Directive
- C# Predicate (Lambda That Returns True or False)
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- C# Random String
- C# Random Number Examples
- C# StreamReader ReadLine, ReadLineAsync Examples
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- C# Regex.Matches Quote Example
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- C# Remove Element
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- C# Reserved Filenames
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- C# Reverse Extension Method
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- C# RNGCryptoServiceProvider Example
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- C# String Constructor (new string)
- C# string.Copy Method
- C# CopyTo String Method: Put Chars in Array
- C# Empty String Examples
- C# String Equals Examples
- C# String For Loop, Count Spaces in String
- C# string.Intern and IsInterned
- C# String IsUpper, IsLower
- C# String Length Property: Get Character Count
- C# String Literal: Newline and Quote Examples
- C# StringBuilder Capacity
- C# StringBuilder Clear (Set Length to Zero)
- C# StringBuilder Data Types
- C# StringBuilder Performance
- C# StringBuilder Equals (If Chars Are Equal)
- C# StringBuilder Memory
- C# StringBuilder ToString: Get String From StringBuilder
- C# StringWriter Class
- C# Sum Method: Add up All Numbers
- C# Switch Char, Test Chars With Cases
- C# Switch Enum
- C# System (using System namespace)
- C# Tag Property: Windows Forms
- C# TextInfo Examples
- C# TextReader, Returned by File.OpenText
- C# TextWriter, Returned by File.CreateText
- C# this Keyword
- C# ThreadPool
- C# Thread Join Method (Join Array of Threads)
- C# ThreadPool.SetMinThreads Method
- C# TimeZone Examples
- C# Get Title From HTML With Regex
- C# ToArray Extension Method
- C# ToCharArray: Convert String to Array
- C# ToDictionary Method
- C# Token
- C# ToList Extension Method
- C# ToLookup Method (Get ILookup)
- C# ToLower and ToUpper: Uppercase and Lowercase Strings
- ToolStripContainer Control: Dock, Properties
- C# ToolTip: Windows Forms
- C# ToString Integer Optimization
- C# ToString: Get String From Object
- C# ToTitleCase Method
- C# TrackBar: Windows Forms
- C# Tree and Nodes Example: Directed Acyclic Word Graph
- C# TreeView Tutorial
- C# Trim Strings
- C# Thread Methods
- C# History
- C# Features
- C# Variables
- C# Data Types
- C# Operators
- C# Keywords
- C# New Features | C# Version Features
- C# Programs
- C# Program to swap numbers without third variable
- C# Program to convert Decimal to Binary
- C# Program to Convert Number in Characters
- C# Program to Print Alphabet Triangle
- C# Program to print Number Triangle
- C# Program to generate Fibonacci Triangle
- C# String Compare() method
- C# String CompareOrdinal() method
- C# String CompareTo() method
- C# String Concat() method
- C# String Contains() method
- C# String CopyTo() method
- C# String EndsWith() method
- C# String Equals() method
- C# String Format() method
- C# String IndexOf() method
- C# String Insert() method
- C# String Intern(String str) method
- C# String IsInterned() method
- C# String Normalize() method
- C# String IsNullOrEmpty() method
- C# String IsNullOrWhiteSpace() method
- C# String Join() method
- C# String LastIndexOf() method
- C# String LastIndexOfAny() method
- C# String PadLeft() method
- C# String PadRight() method
- C# Nullable
- C# String Remove() method
- C# String Replace() method
- C# String Split() method
- C# String StartsWith() method
- C# String SubString() method
- C# Partial Types
- C# Iterators
- C# Delegate Covariance
- C# Delegate Inference
- C# Anonymous Types
- C# Extension Methods
- C# Query Expression
- C# Partial Method
- C# Implicitly Typed Local Variable
- C# Object and Collection Initializer
- C# Auto Implemented Properties
- C# Dynamic Binding
- C# Named and Optional Arguments
- C# Asynchronous Methods
- C# Caller Info Attributes
- C# Using Static Directive
- C# Exception Filters
- C# Await in Catch Finally Blocks
- C# Default Values for Getter Only Properties
- C# Expression Bodied Members
- C# Null Propagator
- C# String Interpolation
- C# nameof operator
- C# Dictionary Initializer
- C# Pattern Matching
- C# Tuples
- C# Deconstruction
- C# Local Functions
- C# Binary Literals
- C# Ref Returns and Locals
- C# Expression Bodied Constructors and Finalizers
- C# Expression Bodied Getters and Setters
- C# Async Main
- C# Default Expression