C Sharp (programming language)

Paradigm| Multi-paradigm: structured, imperative, object-oriented, event-driven, task-driven, functional, generic, reflective, concurrent
Family| C
Designed by| Microsoft
Developer| Microsoft
First appeared| 2000; 26 years ago (2000)[1]
Stable release|

9.0[2] / November 10, 2020; 5 years ago (2020-11-10)

Typing discipline| Static, dynamic,[3] strong, safe, nominative, partially inferred
Platform| Common Language Infrastructure
License|

* Roslyn compiler: MIT/X11[4]
* .NET Core CLR: MIT/X11[5]
* Mono compiler: dual GPLv3 and MIT/X11
* DotGNU: dual GPL and LGPL

Filename extensions| `.cs`, `.csx`
Website| docs.microsoft.com/en-us/dotnet/csharp/
Major implementations
Visual C#, .NET Framework, Mono, .NET Core, DotGNU (discontinued), Universal Windows Platform
Dialects
Cω, Polyphonic C#, Enhanced C#
Influenced by
C++,[6] Cω, Eiffel, F#,[lower-alpha 1] Haskell, Icon, J#, J++, Java,[6] ML, Modula-3, Object Pascal,[7] VB
Influenced
Chapel,[8] Clojure,[9] Crystal,[10] D, J#, Dart,[11] F#, Hack, Java,[12][13] Kotlin, Nemerle, Oxygene, Rust, Swift,[14] Vala, TypeScript

* C Sharp Programming at Wikibooks

C# (/si ʃɑːrp/ see sharp)[lower-alpha 2] is a general-purpose, multi-paradigm programming language. C# encompasses static typing, strong typing, lexically scoped, imperative, declarative, functional, generic, object-oriented (class-based), and component-oriented programming disciplines.[15]

C# was developed around 2000 by Microsoft as part of its .NET initiative and later approved as an international standard by Ecma (ECMA-334) in 2002 and ISO (ISO/IEC 23270) in 2003. It was designed by Anders Hejlsberg, and its development team is currently led by Mads Torgersen, being one of the programming languages designed for the Common Language Infrastructure (CLI). The most recent version is 9.0, which was released in 2020 in .NET 5.0 and included in Visual Studio 2019 version 16.8.[16][17]

Mono is a free and open-source project to develop a cross-platform compiler and runtime environment (i.e. virtual machine) for the language.

## Contents

* 1 Design goals
* 2 History
* 2.1 Name
* 2.2 Versions
* 3 Syntax
* 4 Distinguishing features
* 4.1 Portability
* 4.2 Typing
* 4.3 Metaprogramming
* 4.4 Methods and functions
* 4.5 Property
* 4.6 Namespace
* 4.7 Memory access
* 4.8 Exception
* 4.9 Polymorphism
* 4.10 Language Integrated Query (LINQ)
* 4.11 Functional programming
* 5 Common type system
* 5.1 Categories of data types
* 5.2 Boxing and unboxing
* 6 Libraries
* 7 Examples
* 7.1 Hello World
* 7.2 GUI
* 7.3 Images
* 8 Standardization and licensing
* 9 Implementations
* 10 See also
* 11 Notes
* 12 References
* 13 Further reading
* 14 External links

## Design goals

The Ecma standard lists these design goals for C#:[15]

* The language is intended to be a simple, modern, general-purpose, object-oriented programming language.
* The language, and implementations thereof, should provide support for software engineering principles such as strong type checking, array bounds checking, detection of attempts to use uninitialized variables, and automatic garbage collection. Software robustness, durability, and programmer productivity are important.
* The language is intended for use in developing software components suitable for deployment in distributed environments.
* Portability is very important for source code and programmers, especially those already familiar with C and C++.
* Support for internationalization is very important.
* C# is intended to be suitable for writing applications for both hosted and embedded systems, ranging from the very large that use sophisticated operating systems, down to the very small having dedicated functions.
* Although C# applications are intended to be economical with regard to memory and processing power requirements, the language was not intended to compete directly on performance and size with C or assembly language.

## History

During the development of the .NET Framework, the class libraries were originally written using a managed code compiler system called "Simple Managed C" (SMC).[18][19] In January 1999, Anders Hejlsberg formed a team to build a new language at the time called Cool, which stood for "C-like Object Oriented Language".[20] Microsoft had considered keeping the name "Cool" as the final name of the language, but chose not to do so for trademark reasons. By the time the .NET project was publicly announced at the July 2000 Professional Developers Conference, the language had been renamed C#, and the class libraries and ASP.NET runtime had been ported to C#.

Hejlsberg is C#'s principal designer and lead architect at Microsoft, and was previously involved with the design of Turbo Pascal, Embarcadero Delphi (formerly CodeGear Delphi, Inprise Delphi and Borland Delphi), and Visual J++. In interviews and technical papers he has stated that flaws[21] in most major programming languages (e.g. C++, Java, Delphi, and Smalltalk) drove the fundamentals of the Common Language Runtime (CLR), which, in turn, drove the design of the C# language itself.

James Gosling, who created the Java programming language in 1994, and Bill Joy, a co-founder of Sun Microsystems, the originator of Java, called C# an "imitation" of Java; Gosling further said that "[C# is] sort of Java with reliability, productivity and security deleted."[22][23] Klaus Kreft and Angelika Langer (authors of a C++ streams book) stated in a blog post that "Java and C# are almost identical programming languages. Boring repetition that lacks innovation,"[24] "Hardly anybody will claim that Java or C# are revolutionary programming languages that changed the way we write programs," and "C# borrowed a lot from Java - and vice versa. Now that C# supports boxing and unboxing, we'll have a very similar feature in Java."[25] In July 2000, Hejlsberg said that C# is "not a Java clone" and is "much closer to C++" in its design.[26]

Since the release of C# 2.0 in November 2005, the C# and Java languages have evolved on increasingly divergent trajectories, becoming two quite different languages. One of the first major departures came with the addition of generics to both languages, with vastly different implementations. C# makes use of reification to provide "first-class" generic objects that can be used like any other class, with code generation performed at class-load time.[27] Furthermore, C# has added several major features to accommodate functional-style programming, culminating in the LINQ extensions released with C# 3.0 and its supporting framework of lambda expressions, extension methods, and anonymous types.[28] These features enable C# programmers to use functional programming techniques, such as closures, when it is advantageous to their application. The LINQ extensions and the functional imports help developers reduce the amount of boilerplate code that is included in common tasks like querying a database, parsing an xml file, or searching through a data structure, shifting the emphasis onto the actual program logic to help improve readability and maintainability.[29]

C# used to have a mascot called Andy (named after Anders Hejlsberg). It was retired on January 29, 2004.[30]

C# was originally submitted to the ISO subcommittee JTC 1/SC 22 for review,[31] under ISO/IEC 23270:2003,[32] was withdrawn and was then approved under ISO/IEC 23270:2006.[33] The 23270:2006 is withdrawn under 23270:2018 and approved with this version.[34]

### Name

Microsoft first used the name C# in 1988 for a variant of the C language designed for incremental compilation.[35] That project was not completed but the name lives on.

C-sharp musical note

The name "C sharp" was inspired by the musical notation whereby a sharp symbol indicates that the written note should be made a semitone higher in pitch.[36] This is similar to the language name of C++, where "++" indicates that a variable should be incremented by 1 after being evaluated. The sharp symbol also resembles a ligature of four "+" symbols (in a two-by-two grid), further implying that the language is an increment of C++.[37]

Due to technical limitations of display (standard fonts, browsers, etc.) and the fact that the sharp symbol (U+266F ♯ MUSIC SHARP SIGN (HTML `&#9839;`)) is not present on most keyboard layouts, the number sign (U+0023 # NUMBER SIGN (HTML `&#35;`)) was chosen to approximate the sharp symbol in the written name of the programming language.[38] This convention is reflected in the ECMA-334 C# Language Specification.[15]

The "sharp" suffix has been used by a number of other .NET languages that are variants of existing languages, including J# (a .NET language also designed by Microsoft that is derived from Java 1.1), A# (from Ada), and the functional programming language F#.[39] The original implementation of Eiffel for .NET was called Eiffel#,[40] a name retired since the full Eiffel language is now supported. The suffix has also been used for libraries, such as Gtk# (a .NET wrapper for GTK and other GNOME libraries) and Cocoa# (a wrapper for Cocoa).

### Versions

Version  | Language specification  | Date  | .NET  | Visual Studio

|
|
|
|

Ecma  | ISO/IEC  | Microsoft
C# 1.0  | December 2002 | April 2003 | January 2002 | January 2002  | .NET Framework 1.0  | Visual Studio .NET 2002
C# 1.1
C# 1.2  | October 2003 | April 2003  | .NET Framework 1.1  | Visual Studio .NET 2003
C# 2.0[41] | June 2006 | September 2006 | September 2005[lower-alpha 3] | November 2005  | .NET Framework 2.0
.NET Framework 3.0  | Visual Studio 2005
Visual Studio 2008
C# 3.0[42] | None  | August 2007 | November 2007  | .NET Framework 2.0 (Except LINQ)[43]

.NET Framework 3.0 (Except LINQ)[43]
.NET Framework 3.5

| Visual Studio 2008
C# 4.0[44] | April 2010  | April 2010  | .NET Framework 4  | Visual Studio 2010
C# 5.0[45] | December 2017 | December 2018 | June 2013 | August 2012  | .NET Framework 4.5  | Visual Studio 2012
Visual Studio 2013
C# 6.0[46] | None  | Draft | July 2015  | .NET Framework 4.6
.NET Core 1.0
.NET Core 1.1  | Visual Studio 2015
C# 7.0[47][48] | Specification proposal | March 2017  | .NET Framework 4.7  | Visual Studio 2017 version 15.0
C# 7.1[49] | Specification proposal | August 2017  | .NET Core 2.0  | Visual Studio 2017 version 15.3[50]
C# 7.2[51] | Specification proposal | November 2017  |  | Visual Studio 2017 version 15.5[52]
C# 7.3[53] | Specification proposal | May 2018  | .NET Core 2.1
.NET Core 2.2
.NET Framework 4.8  | Visual Studio 2017 version 15.7[52]
C# 8.0[54] | Specification proposal | September 2019  | .NET Core 3.0
.NET Core 3.1  | Visual Studio 2019 version 16.3[55]
C# 9.0[56] | Specification proposal | September 2020  | .NET 5.0  | Visual Studio 2019 version 16.8[55]

## Syntax

The core syntax of the C# language is similar to that of other C-style languages such as C, C++ and Java, particularly:

* Semicolons are used to denote the end of a statement.
* Curly brackets are used to group statements. Statements are commonly grouped into methods (functions), methods into classes, and classes into namespaces.
* Variables are assigned using an equals sign, but compared using two consecutive equals signs.
* Square brackets are used with arrays, both to declare them and to get a value at a given index in one of them.

## Distinguishing features

Some notable features of C# that distinguish it from C, C++, and Java where noted, are:

### Portability

By design, C# is the programming language that most directly reflects the underlying Common Language Infrastructure (CLI).[57] Most of its intrinsic types correspond to value-types implemented by the CLI framework. However, the language specification does not state the code generation requirements of the compiler: that is, it does not state that a C# compiler must target a Common Language Runtime, or generate Common Intermediate Language (CIL), or generate any other specific format. Theoretically, a C# compiler could generate machine code like traditional compilers of C++ or Fortran.

### Typing

C# supports strongly, implicitly typed variable declarations with the keyword `var`, and implicitly typed arrays with the keyword `new[]` followed by a collection initializer.

C# supports a strict Boolean data type, `bool`. Statements that take conditions, such as `while` and `if`, require an expression of a type that implements the `true` operator, such as the Boolean type. While C++ also has a Boolean type, it can be freely converted to and from integers, and expressions such as `if (a)` require only that `a` is convertible to bool, allowing `a` to be an int, or a pointer. C# disallows this "integer meaning true or false" approach, on the grounds that forcing programmers to use expressions that return exactly `bool` can prevent certain types of programming mistakes such as `if (a = b)` (use of assignment `=` instead of equality `==`).

C# is more type safe than C++. The only implicit conversions by default are those that are considered safe, such as widening of integers. This is enforced at compile-time, during JIT, and, in some cases, at runtime. No implicit conversions occur between Booleans and integers, nor between enumeration members and integers (except for literal 0, which can be implicitly converted to any enumerated type). Any user-defined conversion must be explicitly marked as explicit or implicit, unlike C++ copy constructors and conversion operators, which are both implicit by default.

C# has explicit support for covariance and contravariance in generic types, unlike C++ which has some degree of support for contravariance simply through the semantics of return types on virtual methods.

Enumeration members are placed in their own scope.

The C# language does not allow for global variables or functions. All methods and members must be declared within classes. Static members of public classes can substitute for global variables and functions.

Local variables cannot shadow variables of the enclosing block, unlike C and C++.

### Metaprogramming

Metaprogramming can be achieved in several ways:

* Reflection using framework API
* Expression tree[58] language feature represents code as an abstract syntax tree, where each node is an expression that can be inspected or executed. This enables dynamic modification of executable code at runtime. Expression tree introduced some homoiconicity to the language.
* Attribute language feature are metadata attached to a field or a block of code like assemblies, members and types, and are equivalent to annotations in Java. Attributes are accessible to both the compiler and programmatically through reflection. Many of these attributes duplicate the functionality of GCC's and VisualC++'s platform-dependent preprocessor directives.
* Source generators,[59] feature of Roslyn C# compiler, enable compile time metaprogramming. During the compilation process, developers can inspect the code being compiled (using compiler API) and generate new C# source files that can be added to the compilation.

### Methods and functions

A method in C# is a member of a class that can be invoked as a function (a sequence of instructions), rather than the mere value-holding capability of a class property. As in other syntactically similar languages, such as C++ and ANSI C, the signature of a method is a declaration comprising in order: any optional accessibility keywords (such as `private`), the explicit specification of its return type (such as `int`, or the keyword `void` if no value is returned), the name of the method, and finally, a parenthesized sequence of comma-separated parameter specifications, each consisting of a parameter's type, its formal name and optionally, a default value to be used whenever none is provided. Certain specific kinds of methods, such as those that simply get or set a class property by return value or assignment, do not require a full signature, but in the general case, the definition of a class includes the full signature declaration of its methods.

Like C++, and unlike Java, C# programmers must use the scope modifier keyword `virtual` to allow methods to be overridden by subclasses.[60]

Extension methods in C# allow programmers to use static methods as if they were methods from a class's method table, allowing programmers to add methods to an object that they feel should exist on that object and its derivatives.

The type `dynamic` allows for run-time method binding, allowing for JavaScript-like method calls and run-time object composition.

C# has support for strongly-typed function pointers via the keyword `delegate`. Like the Qt framework's pseudo-C++ signal and slot, C# has semantics specifically surrounding publish-subscribe style events, though C# uses delegates to do so.

C# offers Java-like `synchronized` method calls, via the attribute `[MethodImpl(MethodImplOptions.Synchronized)]`, and has support for mutually-exclusive locks via the keyword `lock`.

### Property

C# supports classes with properties. The properties can be simple accessor functions with a backing field, or implement getter and setter functions.

Since C# 3.0 the syntactic sugar of auto-implemented properties is available,[61] where the accessor (getter) and mutator (setter) encapsulate operations on a single attribute of a class.

### Namespace

A C# `namespace` provides the same level of code isolation as a Java `package` or a C++ `namespace`, with very similar rules and features to a `package`. Namespaces can be imported with the "using" syntax.[62]

### Memory access

In C#, memory address pointers can only be used within blocks specifically marked as unsafe,[63] and programs with unsafe code need appropriate permissions to run. Most object access is done through safe object references, which always either point to a "live" object or have the well-defined null value; it is impossible to obtain a reference to a "dead" object (one that has been garbage collected), or to a random block of memory. An unsafe pointer can point to an instance of an 'unmanaged' value type that does not contain any references to garbage-collected objects, array, string, or a block of stack-allocated memory. Code that is not marked as unsafe can still store and manipulate pointers through the `System.IntPtr` type, but it cannot dereference them.

Managed memory cannot be explicitly freed; instead, it is automatically garbage collected. Garbage collection addresses the problem of memory leaks by freeing the programmer of responsibility for releasing memory that is no longer needed in most cases. Code that retains references to objects longer than is required can still experience higher memory usage than necessary, however once the final reference to an object is released the memory is available for garbage collection.

### Exception

A range of standard exceptions are available to programmers. Methods in standard libraries regularly throw system exceptions in some circumstances and the range of exceptions thrown is normally documented. Custom exception classes can be defined for classes allowing specific handling to be put in place for particular circumstances as needed.[64]

Checked exceptions are not present in C# (in contrast to Java). This has been a conscious decision based on the issues of scalability and versionability.[65]

### Polymorphism

Unlike C++, C# does not support multiple inheritance, although a class can implement any number of "interfaces" (fully abstract classes). This was a design decision by the language's lead architect to avoid complications and to simplify architectural requirements throughout CLI.

When implementing multiple interfaces that contain a method with the same name and taking parameters of the same type in the same order (i.e. the same signature), similar to Java, C# allows both a single method to cover all interfaces and if necessary specific methods for each interface.

However, unlike Java, C# supports operator overloading.[66] Only the most commonly overloaded operators in C++ may be overloaded in C#.

### Language Integrated Query (LINQ)

C# has the ability to utilize LINQ through the .NET Framework. A developer can query a variety of data sources, provided `IEnumerable<T>` interface is implemented on the object. This includes XML documents, an ADO.NET dataset, and SQL databases.[67]

Using LINQ in C# brings advantages like Intellisense support, strong filtering capabilities, type safety with compile error checking ability, and consistency for querying data over a variety of sources.[68] There are several different language structures that can be utilized with C# and LINQ and they are query expressions, lambda expressions, anonymous types, implicitly typed variables, extension methods, and object initializers.[69]

### Functional programming

Though primarily an imperative language, C# 2.0 offered limited support for functional programming through first-class functions and closures in the form of anonymous delegates.[70] C# 3.0 expanded support for functional programming with the introduction of a lightweight syntax for lambda expressions,[71] extension methods (an affordance for modules), and a list comprehension syntax in the form of a "query comprehension" language. C# 7.0 adds features typically found in functional languages like tuples, local functions and pattern matching.[72] C# 9.0 introduces record feature[73] which is primarily built for better supporting immutable data models.

## Common type system

C# has a unified type system. This unified type system is called Common Type System (CTS).[74]

A unified type system implies that all types, including primitives such as integers, are subclasses of the `System.Object` class. For example, every type inherits a `ToString()` method.

### Categories of data types

CTS separates data types into two categories:[74]

1. Reference types
2. Value types

Instances of value types neither have referential identity nor referential comparison semantics. Equality and inequality comparisons for value types compare the actual data values within the instances, unless the corresponding operators are overloaded. Value types are derived from `System.ValueType`, always have a default value, and can always be created and copied. Some other limitations on value types are that they cannot derive from each other (but can implement interfaces) and cannot have an explicit default (parameterless) constructor. Examples of value types are all primitive types, such as `int` (a signed 32-bit integer), `float` (a 32-bit IEEE floating-point number), `char` (a 16-bit Unicode code unit), and `System.DateTime` (identifies a specific point in time with nanosecond precision). Other examples are `enum` (enumerations) and `struct` (user defined structures).

In contrast, reference types have the notion of referential identity, meaning that each instance of a reference type is inherently distinct from every other instance, even if the data within both instances is the same. This is reflected in default equality and inequality comparisons for reference types, which test for referential rather than structural equality, unless the corresponding operators are overloaded (such as the case for `System.String`). Some operations are not always possible, such as creating an instance of a reference type, copying an existing instance, or performing a value comparison on two existing instances. Though specific reference types can provide such services by exposing a public constructor or implementing a corresponding interface (such as `ICloneable` or `IComparable`). Examples of reference types are `object` (the ultimate base class for all other C# classes), `System.String` (a string of Unicode characters), and `System.Array` (a base class for all C# arrays).

Both type categories are extensible with user-defined types.

### Boxing and unboxing

Boxing is the operation of converting a value-type object into a value of a corresponding reference type.[74] Boxing in C# is implicit.

Unboxing is the operation of converting a value of a reference type (previously boxed) into a value of a value type.[74] Unboxing in C# requires an explicit type cast. A boxed object of type T can only be unboxed to a T (or a nullable T).[75]

Example:

int foo = 42;         // Value type.
object bar = foo;     // foo is boxed to bar.
int foo2 = (int)bar;  // Unboxed back to value type.

## Libraries

The C# specification details a minimum set of types and class libraries that the compiler expects to have available. In practice, C# is most often used with some implementation of the Common Language Infrastructure (CLI), which is standardized as ECMA-335 Common Language Infrastructure (CLI).

In addition to the standard CLI specifications, there are many commercial and community class libraries that build on top of the .NET Framework libraries to provide additional functionality.[76]

C# can make calls to any library included in the List of .NET libraries and frameworks.

## Examples

### Hello World

The following is a very simple C# program, a version of the classic "Hello world" example using the top-level statements feature introduced in C# 9:[77]

using System;

Console.WriteLine("Hello, world!");

For code written as C# 8 or lower, the entry point logic of a program must be written in a Main method inside a type:

using System;

// A version of the classic "Hello World" program
class Program

static void Main(string[] args)

Console.WriteLine("Hello, world!");

This code will display this text in the console window:

Hello, world!

Each line has a purpose:

using System;

The above line imports all types in the `System` namespace. For example, the `Console` class used later in the source code is defined in the `System` namespace, meaning it can be used without supplying the full name of the type (which includes the namespace).

// A version of the classic "Hello World" program

This line is a comment; it describes and documents the code for the programmer(s).

class Program

Above is a class definition for the `Program` class. Everything that follows between the pair of braces describes that class.

...

The curly brackets demarcate the boundaries of a code block. In this first instance, they are marking the start and end of the `Program` class.

static void Main(string[] args)

This declares the class member method where the program begins execution. The .NET runtime calls the `Main` method. Unlike in Java, the `Main` method does not need the `public` keyword, which tells the compiler that the method can be called from anywhere by any class.[78] Writing `static void Main(string[] args)` is equivalent to writing `private static void Main(string[] args)`. The static keyword makes the method accessible without an instance of `Program`. Each console application's `Main` entry point must be declared `static` otherwise the program would require an instance of `Program`, but any instance would require a program. To avoid that irresolvable circular dependency, C# compilers processing console applications (like that above) report an error if there is no `static Main` method. The `void` keyword declares that `Main` has no return value.

Console.WriteLine("Hello, world!");

This line writes the output. `Console` is a static class in the `System` namespace. It provides an interface to the standard input, output, and error streams for console applications. The program calls the `Console` method `WriteLine`, which displays on the console a line with the argument, the string `"Hello, world!"`.

### GUI

A GUI example:

using System;
using System.Windows.Forms;

class Program

static void Main()

MessageBox.Show("Hello, World!");
Console.WriteLine("Is almost the same argument!");

This example is similar to the previous example, except that it generates a dialog box that contains the message "Hello, World!" instead of writing it to the console.

### Images

Another useful library is the `System.Drawing` library, which is used to programmatically draw images. For example:

using System;
using System.Drawing;

public class Example

public static Image img;

static void Main()

img = Image.FromFile("Image.png");

This will create an image that is identical to that stored in "Image.png".

## Standardization and licensing

In August 2001, Microsoft Corporation, Hewlett-Packard and Intel Corporation co-sponsored the submission of specifications for C# as well as the Common Language Infrastructure (CLI) to the standards organization Ecma International. In December 2001, ECMA released ECMA-334 C# Language Specification. C# became an ISO standard in 2003 (ISO/IEC 23270:2003 - Information technology — Programming languages — C#). ECMA had previously adopted equivalent specifications as the 2nd edition of C#, in December 2002.

In June 2005, ECMA approved edition 3 of the C# specification, and updated ECMA-334. Additions included partial classes, anonymous methods, nullable types, and generics (somewhat similar to C++ templates).

In July 2005, ECMA submitted to ISO/IEC JTC 1, via the latter's Fast-Track process, the standards and related TRs. This process usually takes 6–9 months.

The C# language definition and the CLI are standardized under ISO and Ecma standards that provide reasonable and non-discriminatory licensing protection from patent claims.

Microsoft has agreed not to sue open source developers for violating patents in non-profit projects for the part of the framework that is covered by the OSP.[79] Microsoft has also agreed not to enforce patents relating to Novell products against Novell's paying customers[80] with the exception of a list of products that do not explicitly mention C#, .NET or Novell's implementation of .NET (The Mono Project).[81] However, Novell maintains that Mono does not infringe any Microsoft patents.[82] Microsoft has also made a specific agreement not to enforce patent rights related to the Moonlight browser plugin, which depends on Mono, provided it is obtained through Novell.[83]

## Implementations

Microsoft is leading the development of the open-source reference C# compilers and set of tools. The first compiler, Roslyn, compiles into intermediate language (IL), and the second one, RyuJIT,[84] is a JIT (just-in-time) compiler, which is dynamic and does on-the-fly optimization and compiles the IL into native code for the front-end of the CPU.[85] RyuJIT is open source and written in C++.[86] Roslyn is entirely written in managed code (C#), has been opened up and functionality surfaced as APIs. It is thus enabling developers to create refactoring and diagnostics tools.[4][87] Two branches of official implementation are .NET Framework (closed source, Windows 10 only since .NET 4.6.2) and .NET Core (open source, multiplatform); .NET Framework and .NET Core converged into one open source implementation .NET 5.0.[88] At .NET Framework 4.6 a new JIT compiler replaced the former.[84][89]

Other C# compilers (some of which include an implementation of the Common Language Infrastructure and .NET class libraries):

* The Mono project provides an open-source C# compiler, a complete open-source implementation of the Common Language Infrastructure including the required framework libraries as they appear in the ECMA specification, and a nearly complete implementation of the Microsoft proprietary .NET class libraries up to .NET 3.5. As of Mono 2.6, no plans exist to implement WPF; WF is planned for a later release; and there are only partial implementations of LINQ to SQL and WCF.[90]
* The Elements tool chain from RemObjects includes RemObjects C#, which compiles C# for .NET, Java, Cocoa, Android, Windows, Linux and WebAssembly.* The DotGNU project (now discontinued) also provided an open-source C# compiler, a nearly complete implementation of the Common Language Infrastructure including the required framework libraries as they appear in the ECMA specification, and subset of some of the remaining Microsoft proprietary .NET class libraries up to .NET 2.0 (those not documented or included in the ECMA specification, but included in Microsoft's standard .NET Framework distribution).
* Xamarin provides tools to develop cross-platform applications for common mobile and desktop operating systems, using C# as a codebase and compiling to native code.

Mono is a common choice for game engines due to its cross-platform nature.[citation needed] The Unity game engine uses Mono C# as its primary scripting language. The Godot game engine has implemented an optional Mono C# module thanks to a donation of $24,000 from Microsoft.[91]

## See also

C# topics

* C# syntax
* Comparison of C# and Java
* Comparison of C# and Visual Basic .NET
* .NET standard libraries

Note: This topic belongs to "Computer programming " portal

IDEs

* Microsoft Visual Studio
* Microsoft Visual Studio Express
* Visual Studio Code
* MonoDevelop
* Morfik
* SharpDevelop
* Turbo C#
* Rider
* Xamarin Studio
* LINQPad

|

## Notes

1. ↑ for async
2. ↑ By convention, a number sign is used for the second character in normal text; in artistic representations, sometimes a true sharp sign is used: C♯. However the ECMA 334 standard states: "The name C# is written as the LATIN CAPITAL LETTER C (U+0043) followed by the NUMBER SIGN # (U+0023)."
3. ↑ The Microsoft C# 2.0 specification document only contains the new 2.0 features. For older features, use the 1.2 specification above.

## References

1. ↑ "InfoQ eMag: A Preview of C# 7". https://www.infoq.com/minibooks/emag-c-sharp-preview.
2. ↑ "Announcing .NET 5.0". November 10, 2020. https://devblogs.microsoft.com/dotnet/announcing-net-5-0/.
3. ↑ Torgersen, Mads (October 27, 2008). "New features in C# 4.0". Microsoft. http://code.msdn.microsoft.com/csharpfuture/Release/ProjectReleases.aspx?ReleaseId=1686.
4. ↑ 4.0 4.1 "The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.: dotnet/roslyn". November 13, 2019. https://github.com/dotnet/roslyn.
5. ↑ "CoreCLR is the runtime for .NET Core. It includes the garbage collector, JIT compiler, primitive data types and low-level classes.: dotnet/coreclr". November 13, 2019. https://github.com/dotnet/coreclr.
6. ↑ 6.0 6.1 Naugler, David (May 2007). "C# 2.0 for C++ and Java programmer: conference workshop". Journal of Computing Sciences in Colleges 22 (5). "Although C# has been strongly influenced by Java it has also been strongly influenced by C++ and is best viewed as a descendant of both C++ and Java.".
7. ↑ Hamilton, Naomi (October 1, 2008). "The A-Z of Programming Languages: C#". Computerworld. http://www.computerworld.com.au/article/261958/a-z_programming_languages_c_/?pp=7. Retrieved February 12, 2010. "We all stand on the shoulders of giants here and every language builds on what went before it so we owe a lot to C, C++, Java, Delphi, all of these other things that came before us. (Anders Hejlsberg)".
8. ↑ "Chapel spec (Acknowledgments)". Cray Inc. 2015-10-01. http://chapel.cray.com/spec/spec-0.98.pdf.
9. ↑ "Rich Hickey Q&A by Michael Fogus". http://www.codequarterly.com/2011/rich-hickey.
10. ↑ Borenszweig, Ary (June 14, 2016). "Crystal 0.18.0 released!". http://crystal-lang.org/2016/06/14/crystal-0.18.0-released.html#comment-2732771703. "It's heavily inspired by Ruby, and other languages (like C#, Go and Python)."
11. ↑ "Web Languages and VMs: Fast Code is Always in Fashion. (V8, Dart) - Google I/O 2013". https://www.youtube.com/watch?v=huawCRlo9H4&t=30m10s.
12. ↑ Java 5.0 added several new language features (the enhanced for loop, autoboxing, varargs and annotations), after they were introduced in the similar (and competing) C# language [1] [2]
13. ↑ Cornelius, Barry (December 1, 2005). "Java 5 catches up with C#". University of Oxford Computing Services. http://www.barrycornelius.com/papers/java5/onefile/. "In my opinion, it is C# that has caused these radical changes to the Java language. (Barry Cornelius)"
14. ↑ Lattner, Chris (2014-06-03). "Chris Lattner's Homepage". Chris Lattner. http://nondot.org/sabre/. "The Swift language is the product of tireless effort from a team of language experts, documentation gurus, compiler optimization ninjas, and an incredibly important internal dogfooding group who provided feedback to help refine and battle-test ideas. Of course, it also greatly benefited from the experiences hard-won by many other languages in the field, drawing ideas from Objective-C, Rust, Haskell, Ruby, Python, C#, CLU, and far too many others to list."
15. ↑ 15.0 15.1 15.2 C# Language Specification (4th ed.). Ecma International. June 2006. https://www.ecma-international.org/publications/files/ECMA-ST/ECMA-334.pdf. Retrieved January 26, 2012.
16. ↑ "Visual Studio 2019 Preview Release Notes" (in en-us). https://docs.microsoft.com/en-us/visualstudio/releases/2019/release-notes-preview.
17. ↑ "Download .NET 5.0 (Linux, macOS, and Windows)" (in en). https://dotnet.microsoft.com/download/dotnet/5.0.
18. ↑ Zander, Jason (November 22, 2007). "Couple of Historical Facts". https://docs.microsoft.com/en-us/archive/blogs/jasonz/couple-of-historical-facts.
19. ↑ Guthrie, Scott (November 28, 2006). "What language was ASP.Net originally written in?". http://aspadvice.com/blogs/rbirkby/archive/2006/11/28/What-language-was-ASP.Net-originally-written-in_3F00_.aspx.
20. ↑ Hamilton, Naomi (October 1, 2008). "The A-Z of Programming Languages: C#". Computerworld. http://www.computerworld.com.au/article/261958/-z_programming_languages_c. Retrieved October 1, 2008.
21. ↑ "Details". http://nilsnaegele.com/techreview/Reviews/Details/1.
22. ↑ Wylie Wong (2002). "Why Microsoft's C# isn't". CNET: CBS Interactive. http://news.cnet.com/2100-1082-817522.html.
23. ↑ Bill Joy (February 7, 2002). "Microsoft's blind spot". cnet.com. https://www.cnet.com/news/microsofts-blind-spot/.
24. ↑ Klaus Kreft and Angelika Langer (2003). "After Java and C# - what is next?". http://www.artima.com/weblogs/viewpost.jsp?thread=6543.
25. ↑ Klaus Kreft and Angelika Langer (July 3, 2003). "After Java and C# - what is next?". artima.com. http://www.artima.com/weblogs/viewpost.jsp?thread=6543.
26. ↑ Osborn, John (August 1, 2000). Deep Inside C#: An Interview with Microsoft Chief Architect Anders Hejlsberg. O'Reilly Media. http://windowsdevcenter.com/pub/a/oreilly/windows/news/hejlsberg_0800.html. Retrieved November 14, 2009.
27. ↑ "Generics (C# Programming Guide)". Microsoft. http://msdn.microsoft.com/en-us/library/512aeb7t.aspx.
28. ↑ Don Box and Anders Hejlsberg (February 2007). "LINQ: .NET Language-Integrated Query". Microsoft. http://msdn.microsoft.com/en-us/library/bb308959.aspx.
29. ↑ Mercer, Ian (April 15, 2010). "Why functional programming and LINQ is often better than procedural code". abodit.com. http://blog.abodit.com/2010/04/why-functional-programming-is-better-linq-c-sharp-than-procedural-code/.
30. ↑ "Andy Retires". Dan Fernandez's Blog. Blogs.msdn.com. January 29, 2004. http://blogs.msdn.com/b/danielfe/archive/2004/01/29/64429.aspx.
31. ↑ "Technical committees - JTC 1/SC 22 - Programming languages, their environments and system software interfaces". ISO. http://www.iso.org/iso/iso_technical_committee.html?commid=45202.
32. ↑ "ISO/IEC 23270:2003 - Information technology - C# Language Specification". Iso.org. August 23, 2006. http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=36768.
33. ↑ "ISO/IEC 23270:2006 - Information technology - Programming languages - C#". Iso.org. January 26, 2012. http://www.iso.org/iso/iso_catalogue/catalogue_ics/catalogue_detail_ics.htm?csnumber=42926.
34. ↑ "SO/IEC 23270:2018 Information technology — Programming languages — C#" (in en). https://www.iso.org/cms/render/live/en/sites/isoorg/contents/data/standard/07/51/75178.html.
35. ↑ Mariani, Rico. "My History of Visual Studio (Part 1) – Rico Mariani's Performance Tidbits". https://blogs.msdn.microsoft.com/ricom/2009/10/05/my-history-of-visual-studio-part-1/.
36. ↑ Kovacs, James (September 7, 2007). "C#/.NET History Lesson". http://www.jameskovacs.com/blog/CNETHistoryLesson.aspx.
37. ↑ Hejlsberg, Anders (October 1, 2008). "The A-Z of Programming Languages: C#". Computerworld. http://www.computerworld.com.au/article/261958/a-z_programming_languages_c_/?pp=2.
38. ↑ "Microsoft C# FAQ". Microsoft. http://msdn.microsoft.com/vcsharp/previous/2002/FAQ/default.aspx.
39. ↑ "F# FAQ". Microsoft Research. http://research.microsoft.com/en-us/um/cambridge/projects/fsharp/faq.aspx.
40. ↑ Simon, Raphael; Stapf, Emmanuel; Meyer, Bertrand (June 2002). "Full Eiffel on the .NET Framework". Microsoft. http://msdn.microsoft.com/en-us/library/ms973898.aspx.
41. ↑ "What's new in the C# 2.0 Language and Compiler". Microsoft. http://msdn.microsoft.com/en-us/library/7cz8t42e(v=vs.80).aspx.
42. ↑ Hejlsberg, Anders; Torgersen, Mads. "Overview of C# 3.0". Microsoft. http://msdn.microsoft.com/en-us/library/bb308966.aspx.
43. ↑ 43.0 43.1 "Using C# 3.0 from .NET 2.0". Danielmoth.com. May 13, 2007. http://www.danielmoth.com/Blog/using-c-30-from-net-20.aspx.
44. ↑ Hejlsberg, Anders. "Future directions for C# and Visual Basic". C# lead architect. Microsoft. http://channel9.msdn.com/Events/BUILD/BUILD2011/TOOL-816T.
45. ↑ "An Introduction to New Features in C# 5.0". Microsoft. http://blogs.msdn.com/b/mvpawardprogram/archive/2012/03/26/introduction-of-new-features-in-c-5-0.aspx.
46. ↑ "Language feature implementation status". Microsoft. https://github.com/dotnet/roslyn/wiki/Languages-features-in-C#-6-and-VB-14.
47. ↑ "What's new in C# 7". 2016-12-21. https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-7.
48. ↑ "New Features in C# 7.0". March 9, 2017. https://blogs.msdn.microsoft.com/dotnet/2017/03/09/new-features-in-c-7-0/.
49. ↑ "What's new in C# 7.1". https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-7-1.
50. ↑ "Visual Studio 2017 15.3 Release Notes". https://docs.microsoft.com/en-us/visualstudio/releasenotes/vs2017-relnotes-v15.3.
51. ↑ "What's new in C# 7.2". https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-7-2.
52. ↑ 52.0 52.1 "Visual Studio 2017 15.9 Release Notes". https://docs.microsoft.com/en-us/visualstudio/releasenotes/vs2017-relnotes.
53. ↑ "What's new in C# 7.3". https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-7-3.
54. ↑ "What's new in C# 8.0". https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-8.
55. ↑ 55.0 55.1 "Visual Studio 2019 16.8 Release Notes". https://docs.microsoft.com/en-us/visualstudio/releases/2019/release-notes.
56. ↑ BillWagner. "What's new in C# 9.0 - C# Guide" (in en-us). https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9.
57. ↑ Visual Studio 2010 and .NET 4 Six-in-One. Wrox Press. 2010. ISBN 978-0470499481.
58. ↑ BillWagner. "Expression Trees (C#)" (in en-us). https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/concepts/expression-trees/.
59. ↑ "Introducing C# Source Generators" (in en-US). 2020-04-29. https://devblogs.microsoft.com/dotnet/introducing-c-source-generators/.
60. ↑ "virtual (C# Reference)" (in en-us). https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/virtual.
61. ↑ "Auto-Implemented Properties (C# Programming Guide)". https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/auto-implemented-properties.
62. ↑ "using directive - C# Reference" (in en-us). https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/using-directive.
63. ↑ BillWagner. "Unsafe code, pointers to data, and function pointers" (in en-us). https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/unsafe-code.
64. ↑ "How to create user-defined exceptions". https://docs.microsoft.com/en-us/dotnet/standard/exceptions/how-to-create-user-defined-exceptions.
65. ↑ Venners, Bill; Eckel, Bruce (August 18, 2003). "The Trouble with Checked Exceptions". http://www.artima.com/intv/handcuffs.html.
66. ↑ BillWagner. "Operator overloading - C# reference" (in en-us). https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/operators/operator-overloading.
67. ↑ Zhang, Xue Dong; Teng, Zi Mu; Zhao, Dong Wang (September 2014). "Research of the Database Access Technology Under.NET Framework". Applied Mechanics and Materials 644-650: 3077–3080. doi:10.4028/www.scientific.net/AMM.644-650.3077. ProQuest 1565579768.
68. ↑ Otey, Michael (February 2006). "LINQ to the Future". SQL Server Magazine 8 (2): 17–21. ProQuest 214859896.
69. ↑ Sheldon, William (November 2010). "New Features in LINQ". SQL Server Magazine 12 (11): 37–40. ProQuest 770609095.
70. ↑ BillWagner. "Anonymous functions - C# Programming Guide" (in en-us). https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/statements-expressions-operators/anonymous-functions.
71. ↑ BillWagner. "Anonymous functions - C# Programming Guide" (in en-us). https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/statements-expressions-operators/anonymous-functions.
72. ↑ "What's New in C# 7.0" (in en-us). https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-7.
73. ↑ "C# 9.0 on the record" (in en-US). 2020-11-10. https://devblogs.microsoft.com/dotnet/c-9-0-on-the-record/.
74. ↑ 74.0 74.1 74.2 74.3 Archer, Tom (2001). "Part 2, Chapter 4: The Type System". Inside C#. Redmond, Washington: Microsoft Press. ISBN 0-7356-1288-9.
75. ↑ Lippert, Eric (March 19, 2009). "Representation and Identity". Fabulous Adventures In Coding. Blogs.msdn.com. http://blogs.msdn.com/b/ericlippert/archive/2009/03/19/representation-and-identity.aspx.
76. ↑ "Framework Libraries". https://docs.microsoft.com/en-us/dotnet/standard/framework-libraries.
77. ↑ BillWagner. "What's new in C# 9.0 - C# Guide" (in en-us). https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9.
78. ↑ BillWagner. "Main() and command-line arguments" (in en-us). https://docs.microsoft.com/en-us/dotnet/csharp/fundamentals/program-structure/main-command-line.
79. ↑ "Patent Pledge for Open Source Developers". https://msdn.microsoft.com/en-us/openspecifications/dn646765.
80. ↑ "Patent Cooperation Agreement - Microsoft & Novell Interoperability Collaboration". Microsoft. November 2, 2006. http://www.microsoft.com/interop/msnovellcollab/patent_agreement.mspx. "Microsoft, on behalf of itself and its Subsidiaries (collectively "Microsoft"), hereby covenants not to sue Novell's Customers and Novell's Subsidiaries' Customers for infringement under Covered Patents of Microsoft on account of such a Customer's use of specific copies of a Covered Product as distributed by Novell or its Subsidiaries (collectively "Novell") for which Novell has received Revenue (directly or indirectly) for such specific copies; provided the foregoing covenant is limited to use by such Customer (i) of such specific copies that are authorized by Novell in consideration for such Revenue, and (ii) within the scope authorized by Novell in consideration for such Revenue."
81. ↑ "Definitions". Microsoft. November 2, 2006. http://www.microsoft.com/interop/msnovellcollab/definitions2.aspx.
82. ↑ Steinman, Justin (November 7, 2006). "Novell Answers Questions from the Community". http://www.novell.com/linux/microsoft/faq_opensource.html. "We maintain that Mono does not infringe any Microsoft patents."
83. ↑ "Covenant to Downstream Recipients of Moonlight - Microsoft & Novell Interoperability Collaboration". Microsoft. September 28, 2007. http://www.microsoft.com/interop/msnovellcollab/moonlight.mspx. ""Downstream Recipient" means an entity or individual that uses for its intended purpose a Moonlight Implementation obtained directly from Novell or through an Intermediate Recipient... Microsoft reserves the right to update (including discontinue) the foregoing covenant... "Moonlight Implementation" means only those specific portions of Moonlight 1.0 or Moonlight 1.1 that run only as a plug-in to a browser on a Personal Computer and are not licensed under GPLv3 or a Similar License."
84. ↑ 84.0 84.1 "The RyuJIT transition is complete!". June 19, 2018. https://devblogs.microsoft.com/dotnet/the-ryujit-transition-is-complete/.
85. ↑ "Managed Execution Process". https://docs.microsoft.com/en-us/dotnet/standard/managed-execution-process.
86. ↑ "coreclr/src/jit/". https://github.com/dotnet/coreclr/tree/master/src/jit.
87. ↑ "C# Guide". https://docs.microsoft.com/en-us/dotnet/csharp/.
88. ↑ "5.0.8". https://dotnet.microsoft.com/download/dotnet/5.0.
89. ↑ "Mitigation: New 64-bit JIT Compiler". https://docs.microsoft.com/en-us/dotnet/framework/migration-guide/mitigation-new-64-bit-jit-compiler.
90. ↑ "Compatibility - Mono". Mono-project.com. December 19, 2011. http://www.mono-project.com/Compatibility.
91. ↑ Etcheverry, Ignacio (October 21, 2017). "Introducing C# in Godot". Godot Engine. https://godotengine.org/article/introducing-csharp-godot.

## Further reading

* Drayton, Peter; Albahari, Ben; Neward, Ted (2002). C# Language Pocket Reference. O'Reilly. ISBN 0-596-00429-X. https://archive.org/details/clanguagepocketr00pete.
* Petzold, Charles (2002). Programming Microsoft Windows with C#. Microsoft Press. ISBN 0-7356-1370-2. https://archive.org/details/isbn_9780735613706.

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List of International Electrotechnical Commission standards

IEC standards|

* IEC 60027
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* AES3
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* IEC 61030
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* IEC 61960
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* IEC 62680
* IEC 62682
* IEC 62700

ISO/IEC standards|

* ISO/IEC 646
* ISO/IEC 2022
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* ISO/IEC 5218
* ISO/IEC 6429
* ISO/IEC 6523
* ISO/IEC 7810
* ISO/IEC 7811
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* ISO/IEC 7813
* ISO/IEC 7816
* ISO/IEC 7942
* ISO/IEC 8613
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* ISO/IEC 9126
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* ISO/IEC 9593
* ISO/IEC 9899
* ISO/IEC 9945
* ISO/IEC 9995
* ISO/IEC 10021
* ISO/IEC 10116
* ISO/IEC 10165
* ISO/IEC 10179
* ISO/IEC 10646
* ISO/IEC 10967
* ISO/IEC 11172
* ISO/IEC 11179
* ISO/IEC 11404
* ISO/IEC 11544
* ISO/IEC 11801
* ISO/IEC 12207
* ISO/IEC 13250
* ISO/IEC 13346
* ISO/IEC 13522-5
* ISO/IEC 13568
* ISO/IEC 13818
* ISO/IEC 14443
* ISO/IEC 14496
* ISO/IEC 14882
* ISO/IEC 15288
* ISO/IEC 15291
* ISO/IEC 15408
* ISO/IEC 15444
* ISO/IEC 15445
* ISO/IEC 15504
* ISO/IEC 15511
* ISO/IEC 15693
* ISO/IEC 15897
* ISO/IEC 15938
* ISO/IEC 16262
* ISO/IEC 17024
* ISO/IEC 17025
* ISO/IEC 18000
* ISO/IEC 18004
* ISO/IEC 18014
* ISO/IEC 19752
* ISO/IEC 19757
* ISO/IEC 19770
* ISO/IEC 19788
* ISO/IEC 20000
* ISO/IEC 21000
* ISO/IEC 21827
* ISO/IEC 23000
* ISO/IEC 23003
* ISO/IEC 23008
* ISO/IEC 23270
* ISO/IEC 23360
* ISO/IEC 24707
* ISO/IEC 24727
* ISO/IEC 24744
* ISO/IEC 24752
* ISO/IEC 26300
* ISO/IEC 27000
* ISO/IEC 27000-series
* ISO/IEC 27002
* ISO/IEC 27040
* ISO/IEC 29119
* ISO/IEC 33001
* ISO/IEC 38500
* ISO/IEC 42010
* ISO/IEC 80000

Related|

* International Electrotechnical Commission

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