WillFuqua

The Implementation of C# Local Functions

C# 7 local functions provide a more intuitive syntax over creating verbose System.Func delegates, as well as being more capable (they support ref and out parameters, async, generics, etc). In addition, some articles have mentioned that local functions compile down to normal methods, thus reducing GC allocations when compared to System.Func.

I was curious about that last part. How does it work? Let’s open up the dotPeek decompiler and find out!

First, here’s a simple test program using a local function:

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine(AddFive(7));
    }

 
continue.
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