What is Func, how and when is it used

Question

What is Func<> and what is it used for?

Answer 1

Func represents a function, that takes (T1, T2, ..., Tn) arguments and returns Tr.

For example, if you have a function:

double sqr(double x) { return x * x; }

You could save it as some kind of a function-variable:

Func f1 = sqr;
Func f2 = x => x * x;

And then use exactly as you would use sqr:

f1(2);
Console.WriteLine(f2(f1(4)));

etc.

Remember though, that it's a delegate, for more advanced info refer to documentation.