C# (pronounced 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.
C# is a multi-paradigm, managed, object-oriented programming language created by Microsoft in conjunction with the .NET platform. C# is also used with non-Microsoft implementations (most notably, Mono).
Versions 1.0/1.2 and 2.0 of C# were submitted and approved as both ECMA and ISO/IEC standards. As of December 2010, there are no ECMA or ISO/IEC specifications for C# 3.0 and 4.0, however language specifications are available from Microsoft (3.0 and 4.0 respectively).
The language's type system was originally static, with only explicit variable declarations allowed. However, the introduction of var (C# 3.0) and dynamic (C# 4.0) allow it to use type inference for implicit variable typing, and to consume dynamic type systems, respectively. Delegates (especially with lexical closure support for anonymous methods (C# 2.0) and lambda expressions (C# 3.0)) allow the language to be used for functional programming.
Compilation is usually to the Common Intermediate Language (CIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR); however, options like Ngen (.NET) and AOT (Mono) mean this isn't the only option. Additionally, some frameworks (e.g. the Micro Framework) act as CIL interpreters, with no JIT.
Perhaps unusually, generics in C# are provided (in part) by the runtime, unlike (for comparison) C++ templates, or Java's generics (which use type-erasure).
With the combination of Microsoft .NET for Windows (desktop/server), Mono (desktop/server/mobile), Silverlight / Moonlight (browser/mobile), Compact Framework (mobile), and Micro Framework (embedded devices), it is available for a wide range of platforms.
Hello World
using System;
class Hello
{
static void Main()
{
Console.WriteLine("Hello, World!");
}
}
FAQs
- What are the correct version numbers for C#?
- Why is
Randomgiving the same results every time? - Captured variables in loops
- Why can't I convert
List<Banana>toList<Fruit>? - Does C# pass objects by reference?
- Why does the compiler complain about my conditional expression (
a == b ? x : y)? - Why do I get a
NullReferenceException? (Object reference not set to instance of object) - What's new in C# 4.0?
Resources
Books
- CLR via C#
- C# in a Nutshell
- C# in Depth
- Accelerated C#
- Head First C#
- The C# Programming Language (3rd Edition, 4th Edition)
- Framework Design Guidelines
- Essential C# (4.0 (3rd Edition))
- Pro C# 2010 and the .NET 4 Platform
- MCTS Self-Paced Training Kit (Exam 70-536): Microsoft® .NET Framework 2.0 Foundation
- C# how to program
- visual C# .Net step by step