Define an extension method in C#. Extension methods are a feature of the C# programming language that enable you to extend functionality to a type without inheriting from the type, recompiling the ...

When it’s compiled by the C# compiler, a local function gets transformed into a private method. ... In this example, the Sum method is a local function — it’s local to the Main method.

Whereas the old BASIC feature provided little more than a jump destination in its syntax, local functions in C# are full methods, complete with parameters, return values and, if you want, asynchronous ...

Source Generators in C# 9 will allow compiler-extensions to inspect code and then inject additional source code at compile-time. This injected code is then incorporated into the very same assembly tha ...