C# Features from 1.0 to 9.0

here is a summary list of C# feature from 1.0 to 8.0

Version 1.0

• Classes
• Structs
• Interfaces
• Events
• Properties
• Delegates
• Expressions
• Statements
• Attributes

Version 2.0

• Generics
• Partial types
• Anonymous methods
• Nullable value types
• Iterators
• Covariance and contravariance

Version 3.0

• Auto-implemented properties
• Anonymous types
• Query expressions
• Lambda expressions
• Expression trees
• Extension methods
• Implicitly typed local variables
• Partial methods
• Object and collection initializers

version 4.0

• Dynamic binding
• Named/optional arguments
• Generic covariant and contravariant
• Embedded interop types

Version 5.0

• Asynchronous members
• Caller info attributes

version 6.0

• Static imports
• Exception filters
• Auto-property initializers
• Expression bodied members
• Null propagator
• String interpolation
• nameof operator
• Index initializers

Version 7.0

• Out variables
• Tuples and deconstruction
• Pattern matching
• Local functions
• Expanded expression bodied members
• Ref locals and returns
• Discards
• Binary Literals and Digit Separators
• Throw expressions

Version 8.0

• Readonly members
• Default interface methods
• Pattern matching enhancements:
  • Switch expressions
  • Property patterns
  • Tuple patterns
  • Positional patterns
• Using declarations
• Static local functions
• Disposable ref structs
• Nullable reference types
• Asynchronous streams
• Indices and ranges
• Null-coalescing assignment
• Unmanaged constructed types
• Stackalloc in nested expressions
• Enhancement of interpolated verbatim strings

Version 9.0

• Records
• Init only setters
• Top-level statements
• Pattern matching enhancements
• Performance and interop
  • Native sized integers
  • Function pointers
  • Suppress emitting localsinit flag
• Fit and finish features
  • 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
• Support for code generators
  • Module initializers
  • New features for partial methods