C# 7.0 adds a new feature called local functions, which allows local methods to be defined and called within a method. This wasn’t possible in the previous versions. The following code snippet defines a method named "Add" inside the "Main" method and calls within the "Main" method.

  1. static void Main(string[] args)
  2. {
  4. int Add(int a, int b)
  5. {
  6. return a + b;
  7. }
  9. Console.WriteLine(Add(3,4));
  10. Console.ReadKey();
  11. }

As its name suggests, a local function is available to the method it is defined inside only.

Summary

Local functions is a new concept introduced in C# 7.0. In this article, we learned how to write and use a local function.

Next C# 7.0 Feature - Literal Improvements in C# 7.0

References

References used to write this article,

https://blogs.msdn.microsoft.com/dotnet/2016/08/24/whats-new-in-csharp-7-0/