static void Mycallback(IAsyncResult ir)
{
MathDelegate d = ir.AsyncState as MathDelegate;
long result = d.EndInvoke(ir);
Console.WriteLine("result=" + result);
}
static void Main(string[] args)
{
MathClass math = new MathClass();
MCDelegate del = new MCDelegate(math.M1);
del += new MCDelegate(MathClass.M2);
del += new MCDelegate(math.M1);
del();
del -= new MCDelegate(math.M1);
del();
MathDelegate del1, del2;
del1 = new MathDelegate(math.Add);
del2 = new MathDelegate(MathClass.Multiply);
//MyInovoke(del1);
AsyncCallback mycallback = delegate(IAsyncResult ir)
{
long result = del1.EndInvoke(ir);
Console.WriteLine($"The add result done async is {result}");
};
IAsyncResult iar = del1.BeginInvoke(111, 333, mycallback, null);
Console.WriteLine(del2.Invoke(333, 455));
Console.ReadLine();
}