public static void MethodCall()
{
const int loops = 1000000000;
int x = 0;
ClassB b = new ClassB();
Console.WriteLine("Method Call Overhead:");
Stopwatch watch = new Stopwatch();
watch.Start();
for (int i = 0; i < loops; i++)
{
x = x + 2;
}
watch.Stop();
Report("No function", loops, watch.ElapsedMilliseconds);
x -= 2 * loops;
watch.Restart();
for (int i = 0; i < loops; i++)
{
x = b.Func1(x);
}
watch.Stop();
Report("Non-virtual", loops, watch.ElapsedMilliseconds);
x -= 2 * loops;
watch.Restart();
for (int i = 0; i < loops; i++)
{
x = b.Func2(x);
}
watch.Stop();
Report("override", loops, watch.ElapsedMilliseconds);
x -= 2 * loops;
watch.Restart();
for (int i = 0; i < loops; i++)
{
x = b.Func3(x);
}
watch.Stop();
Report("sealed override", loops, watch.ElapsedMilliseconds);
x -= 2 * loops;
ClassA a = b;
watch.Restart();
for (int i = 0; i < loops; i++)
{
x = a.Func2(x);
}
watch.Stop();
Report("virtual via override", loops, watch.ElapsedMilliseconds);
x -= 2 * loops;
watch.Restart();
for (int i = 0; i < loops; i++)
{
x = a.Func3(x);
}
watch.Stop();
Report("Sealed via override", loops, watch.ElapsedMilliseconds);
x -= 2 * loops;
Console.WriteLine(x); // so the compiler doesn't optimize it away
}