C# 14 introduces new syntax for defining extension members, expanding on traditional extension methods. Key additions include:
-
Extension properties and indexers alongside extension methods.
-
Ability to define static extension members, making them appear as if they are static members of the extended type
Two Types of Extension Blocks:
Instance-like extension members (e.g., sequence.IsEmpty):
extension<TSource>(IEnumerable<TSource> source)
{
public bool IsEmpty => !source.Any();
public TSource this[int index] => source.Skip(index).First();
public IEnumerable<TSource> Where(Func<TSource, bool> predicate) { ... }
}
Static-like extension members (e.g., IEnumerable<int>.Identity):
extension<TSource>(IEnumerable<TSource>)
{
public static IEnumerable<TSource> Combine(IEnumerable<TSource> first, IEnumerable<TSource> second) { ... }
public static IEnumerable<TSource> Identity => Enumerable.Empty<TSource>();
}
These features allow more natural syntax and better integration with existing types by simulating both instance and static members via extensions.
Cheers
Samitha
