static void Main(string[] args)
{
ACalculator calc = new ACalculator();
int x = calc.Add(3, 4);
// MathOp op1 = new MathOp(calc.Add); // AddressOf calc.Add
MathOp op1 = calc.Add;
//int result = op1(3, 2);
op1 = calc.Subtract;
// int result2 = op1(3, 2);
IAsyncResult ar = op1.BeginInvoke(3, 2, CalcCompleted, op1);
// int result3 = op1.EndInvoke(ar);
//result = op1(3, 2);
op1 += calc.Add;
int result = op1(7, 2);
Console.WriteLine(result);
Func <int, int, int> op2 = calc.Add;
result = op2(11, 3);
Console.ReadLine();
}
private void CallIt()
{
MathOp op = Add;
double z = 0;
// issue the call and return
var ar = op.BeginInvoke(
3, 4, out z, ref _c,
Completed, op);
}