C# - Programming language

C# is an open source programming language created in 2000 by Anders Hejlsberg.

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C# (pronounced as see sharp) is a multi-paradigm programming language encompassing strong typing, imperative, declarative, functional, generic, object-oriented (class-based), and component-oriented programming disciplines. It was developed by Microsoft within its .NET initiative and later approved as a standard by Ecma (ECMA-334) and ISO (ISO/IEC 23270:2006). C# is one of the programming languages designed for the Common Language Infrastructure. Read more on Wikipedia...

Tags: programming language
There are at least 2,161,625 C# repos on GitHub
Early development of C# happened in Microsoft
The Google BigQuery Public Dataset GitHub snapshot shows 83k users using C# in 133k repos on GitHub
Check out the 802 C# meetup groups on Meetup.com.
There are 202,070 members in the C# subreddit
There are 14,113 Project Euler users using C#
In the 2021 StackOverflow developer survey C# programmers reported a median salary of $58,368. 28% of respondents reported using C#. 22,984 programmers reported using C#, and 17,999 said they wanted to use it
C# on HOPL
C# ranks #5 in the TIOBE Index
ANTLR grammar for C#
C# LSP implementation
Monaco package for syntax highlighting C#
Pygments supports syntax highlighting for C#
GitHub supports syntax highlighting for C#
Learn C# on exercism.
There is 1 Jupyter Kernel for C#
There is a central package repository for C#
Indeed.com has 19,747 matches for "c# developer".
See also: (34 related languages) Spec Sharp, Eiffel, Java, Modula-3, Object Pascal, ML, Visual Basic, Icon, Haskell, Rust, J#, F#, Chapel, Crystal, D, Dart, Hack, Kotlin, Monkey, Nemerle, Oxygene, Swift, Vala, Unity, C, Turbo Pascal, Smalltalk, LINQ, A#, Ada, CIL, Fortran, Visual Studio, Morfik
66 PLDB concepts link to C#: Ace Editor, adamant, Apache Arrow, Bazel, beef-lang, Bicep, cat, Chapel, Ć, clike, cloc, Dafny, Deno, DRAKON, ecsharp, Eiffel, flame-ir, FlatBuffers, Flow9, GAP, groff, HHVM, ImHex, ink, invokator, Ioke, jinx, Jison, jsil-compiler, Koka, mages, mal, manhood, MarkovJunior, Mond, MonkeyX, moya, muon, Nemerle, Node.js, OpenCV, P, Particles, plang, Pomsky, POV-Ray SDL, PowerShell, PRQL, Pygments, Racket, rant, Ripple, Roslyn compiler, Scoop, Simple Binary Encoding, Snowball, SourcePawn, Script.NET, TensorFlow, typecobol, Uno, V, Vale, Violent ES, Wax, Wonkey

Example from Compiler Explorer:

class Program
{
    static int Square(int num) => num * num;
}

Example from Riju:

class main {
    static void Main(string[] args) {
        System.Console.WriteLine("Hello, world!");
    }
}

Example from hello-world:

System.Console.WriteLine("Hello World");

Example from Linguist:

using System;

namespace MongoDB.Serialization.Descriptors
{
    internal class BsonPropertyValue
    {
        public bool IsDictionary { get; private set; }

        public Type Type { get; private set; }

        public object Value { get; private set; }

        public BsonPropertyValue(Type type, object value, bool isDictionary)
        {
            Type = type;
            Value = value;
            IsDictionary = isDictionary;
        }
    }
}

Example from Wikipedia:

using System.Windows.Forms;

class Program
{
    static void Main(string[] args)
    {
        MessageBox.Show("Hello, World!");
        System.Console.WriteLine("Is almost the same argument!");
    }
}

C# Keywords

abstract add alias as ascending async await base bool break byte case catch char checked class const continue decimal default delegate descending do double dynamic else enum event explicit extern false finally fixed float for foreach from get global goto group if implicit in int interface internal into is join let lock long namespace new null object operator orderby out override params partial private protected public readonly record ref remove return sbyte sealed select set short sizeof stackalloc static string struct switch this throw true try typeof uint ulong unchecked unsafe ushort using value var virtual void volatile where while yield

Language features

Feature	Supported	Example	Token
Standard Library	✓	Console.WriteLine("Hello, World!");
Conditionals	✓
Access Modifiers	✓
Switch Statements	✓
Exceptions	✓
Constants	✓
Classes	✓
While Loops	✓
Case Sensitivity	✓
Function Composition	✓	// Call example: // var c = Compose(f, g); // // Func g = _ => ... // Func f = _ => ... Func Compose(Func f, Func g) => _ => f(g(_));
Default Parameters Pattern	✓	public void ExampleMethod(string optionalstr = "default string") {}
Line Comments	✓	// A comment	//
Dispose Blocks Pattern	✓	using (Resource resource = GetResource()) { // Perform actions with the resource. ... }
Module Pattern	✓	// In C#, namespaces are the semi-equivalent of Java's packages. namespace com.test { class Test {} }
Operator Overloading	✓
Namespaces	✓	namespace MyNamespace; class MyClass { public void MyMethod() { System.Console.WriteLine("Creating my namespace"); } }
File Imports	✓	using static System.Console; using static System.Math; class Program { static void Main() { WriteLine(Sqrt(33 + 44)); } }
Type Casting	✓	Animal animal = new Cat(); Bulldog b = (Bulldog) animal; // if (animal is Bulldog), stat.type(animal) is Bulldog, else an exception b = animal as Bulldog; // if (animal is Bulldog), b = (Bulldog) animal, else b = null animal = null; b = animal as Bulldog; // b == null
Directives	✓	#define MAX_CLIENTS 200 int array[MAX_CLIENTS]; #if PRODUCTION //code #elif DEVELOPMENT //code #else //code #endif
Generators	✓	// Method that takes an iterable input (possibly an array) // and returns all even numbers. public static IEnumerable GetEven(IEnumerable numbers) { foreach (int i in numbers) { if ((i % 2) == 0) { yield return i; } } }
Constructors	✓	public class MyClass { private int a; private string b; // Constructor public MyClass() : this(42, "string") { } // Overloading a constructor public MyClass(int a, string b) { this.a = a; this.b = b; } } // Code somewhere // Instantiating an object with the constructor above MyClass c = new MyClass(42, "string");
Generics	✓	// Declare the generic class. public class GenericList { public void Add(T input) { } } class TestGenericList { private class ExampleClass { } static void Main() { // Declare a list of type int. GenericList list1 = new GenericList(); list1.Add(1); // Declare a list of type string. GenericList list2 = new GenericList(); list2.Add(""); // Declare a list of type ExampleClass. GenericList list3 = new GenericList(); list3.Add(new ExampleClass()); } }
Pointers	✓	// Pointers supported only under certain conditions. // Get 16 bytes of memory from the process's unmanaged memory IntPtr pointer = System.Runtime.InteropServices.Marshal.AllocHGlobal(16);
Async Await	✓	public async Task FindPageSize(Uri uri) { byte[] data = await new WebClient().DownloadDataTaskAsync(uri); return data.Length; }
MultiLine Comments	✓	/* A comment */	/* */
Print() Debugging	✓	Console.WriteLine("This is C#");	Console.WriteLine
Assignment	✓	int pldb = 80766866;
Integers	✓	int pldb = 80766866;
Booleans	✓		true false
Strings	✓	"hello world"	"
Comments	✓	// A comment
Semantic Indentation	X