C # delegation (1)

Delegate declaration--Define a signature:
Delegate double mathaction (double num);

Class DelegateTest
{
General methods that conform to a delegate declaration
Static double double (double input)
{
return input * 2;
}

static void Main ()
{
Instantiating a delegate type using a named method
Mathaction ma = Double;

Invoking a delegate instance
Double multbytwo = MA (4.5);
Console.WriteLine (Multbytwo);

To instantiate a delegate type with an anonymous method
Mathaction Ma2 = delegate (double input)
{
return input * input;
};

Double square = MA2 (5);
Console.WriteLine (square);

Finally, using a lambda expression to instantiate the delegate type
Mathaction MA3 = s + = S * S * s;
Double cube = MA3 (4.375);

Console.WriteLine (Cube);
}
}

C # delegation (1)