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LanguageVersion Enum

Definition

Specifies the language version.

public enum class LanguageVersion
public enum LanguageVersion
type LanguageVersion = 
Public Enum LanguageVersion
Inheritance
LanguageVersion

Fields

Name Value Description
Default 0

The default language version, which is the latest supported version.

CSharp1 1

C# language version 1

CSharp2 2

C# language version 2

CSharp3 3

C# language version 3

Features: LINQ.

CSharp4 4

C# language version 4

Features: dynamic.

CSharp5 5

C# language version 5

Features: async, caller info attributes.

CSharp6 6

C# language version 6

Features:

  • Using of a static class
  • Exception filters
  • Await in catch/finally blocks
  • Auto-property initializers
  • Expression-bodied methods and properties
  • Null-propagating operator ?.
  • String interpolation
  • nameof operator
  • Dictionary initializer
CSharp7 7

C# language version 7.0

Features:

  • Out variables
  • Pattern-matching
  • Tuples
  • Deconstruction
  • Discards
  • Local functions
  • Digit separators
  • Ref returns and locals
  • Generalized async return types
  • More expression-bodied members
  • Throw expressions
CSharp7_1 701

C# language version 7.1

Features:

  • Async Main
  • Default literal
  • Inferred tuple element names
  • Pattern-matching with generics
CSharp7_2 702

C# language version 7.2

Features:

  • Ref readonly
  • Ref and readonly structs
  • Ref extensions
  • Conditional ref operator
  • Private protected
  • Digit separators after base specifier
  • Non-trailing named arguments
CSharp7_3 703

C# language version 7.3

Features:

  • Indexing fixed fields does not require pinning
  • ref local variables may be reassigned
  • stackalloc arrays support initializers
  • More types support the fixed statement
  • Enhanced generic constraints
  • Tuples support == and !=
  • Attach attributes to the backing fields for auto-implemented properties
  • Method overload resolution improvements when arguments differ by 'in'
  • Extend expression variables in initializers
  • Improved overload candidates
  • New compiler options (-publicsign and -pathmap)
CSharp8 800

C# language version 8.0

Features:

  • Readonly members
  • Default interface methods
  • Pattern matching enhancements (switch expressions, property patterns, tuple patterns, and positional patterns)
  • Using declarations
  • Static local functions
  • Disposable ref structs
  • Nullable reference types
  • Asynchronous streams
  • Asynchronous disposable
  • Indices and ranges
  • Null-coalescing assignment
  • Unmanaged constructed types
  • Stackalloc in nested expressions
  • Enhancement of interpolated verbatim strings
CSharp9 900

C# language version 9.0

Features:

  • Records
  • Init only setters
  • Top-level statements
  • Pattern matching enhancements
  • Native sized integers
  • Function pointers
  • Suppress emitting localsinit flag
  • Target-typed new expressions
  • Static anonymous functions
  • Target-typed conditional expressions
  • Covariant return types
  • Extension GetEnumerator support for foreach loops
  • Lambda discard parameters
  • Attributes on local functions
  • Module initializers
  • New features for partial methods
CSharp10 1000

C# language version 10.0

Features:

  • Record structs
  • Global using directives
  • Lambda improvements
  • Improved definite assignment
  • Constant interpolated strings
  • Mix declarations and variables in deconstruction
  • Extended property patterns
  • Sealed record ToString
  • Source Generator v2 APIs
  • Method-level AsyncMethodBuilder
CSharp11 1100

C# language version 11.0
Features:

  • Raw string literals
  • Static abstract members in interfaces
  • Generic attributes
  • Newlines in interpolations
  • List-patterns
  • Required members
  • Span<char> constant pattern
  • Struct auto-default
  • Nameof(parameter)
  • Checked user-defined operators
  • UTF-8 string literals
  • Unsigned right-shift operator
  • Relaxed shift operator
  • Ref fields
  • File-local types
CSharp12 1200

C# language version 12.0
Features:

  • Primary constructors
  • Using aliases for any types
  • Nameof accessing instance members
  • Inline arrays
  • Collection expressions
  • Ref readonly parameters
  • Lambda optional parameters
CSharp13 1300

C# language version 13.0
Features:

  • Escape character
  • Method group natural type improvements
  • `Lock` object
  • Implicit indexer access in object initializers
  • `params` collections
  • ref/unsafe in iterators/async
  • `allows ref struct` constraint
  • Partial properties
LatestMajor 2147483645

The latest major supported version.

Preview 2147483646

Preview of the next language version.

Latest 2147483647

The latest supported version of the language.

Applies to