Duck typing in the C# compiler

Question

Note This is not a question about how to implement or emulate duck typing in C#...

For several years I was under the impression that certai

Answer 1

The question which you are asking is not a chicken and egg situation. Its more like hows the language compiler is implemented. Like C# and VB.NET compiler are implemented differently.If you write a simple code of hello world and compile it with both the compiler and inspect the IL code they will be different. Coming back to your question, I will like to explain what IL code is generated by C# compiler for IEnumerable.

IEnumerator e = arr.GetEnumerator();

while(e.MoveNext())
{
   e.Currrent;
}

So the C# compiler is tweaked for the case of foreach.