Делегат
//A delegate is an object that knows how to call a method.
delegate int Transformer (int x);
//Transformer is compatible with any method
//with an int return type and a single int parameter,
int Square (int x)
{
return x * x;
}
//Or, more tersely:
int Square (int x) => x * x;
//Assigning a method to a delegate variable creates a delegate instance:
Transformer t = Square;
//You can invoke a delegate instance in the same way as a method:
int answer = t(3); // answer is 9
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