C# – Properties & Events

Properties & Events

Property syntax evolved for terseness and correctness.

Feature map

• Auto-implemented properties
• Expression-bodied members
• Init-only setters
• Required members
• Indexers

Feature map (advanced)

• Lazy properties
• Properties with validation
• Computed properties

Comparison of property variants

Variant	Introduced	Description
Basic properties	C# 1.0	Manual getter/setter with explicit backing field.
Auto-implemented	C# 3.0	Compiler-generated backing field.
Read-only (get-only)	C# 6.0	Immutable after construction.
Auto-property initializers	C# 6.0	Default values for auto-props.
Expression-bodied (get/set)	C# 6.0�7.0	Concise accessors with =>.
Init-only (init)	C# 9.0	Settable only during initialization.
Required members	C# 11.0	Enforce initialization in object creation.
Partial properties	C# 13.0 (preview)	Split accessors across partial types.
field in accessors	C# 13.0 (preview)	Use implicit backing field inside accessors.