using System;

using System.Diagnostics;

public class Program

{

​

    [System.Runtime.CompilerServices.MethodImpl(

        System.Runtime.CompilerServices.MethodImplOptions.NoInlining |

        System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]

    public static void Main()

    {

        IShape s = new Rectangle();

        AbstractShape c = new Circle();

​

        Stopwatch s1 = new Stopwatch();

        s1.Start();

        for(var i = 0; i<100000000; i++) {

            CallStruct(s, i,i+4);

        }

        s1.Stop();

        Console.WriteLine(s1.ElapsedMilliseconds);

        s1 = new Stopwatch();

        s1.Start();

        for(var i = 0; i<100000000; i++) {

            CallVirtual(c, i,i+4);

        }

        s1.Stop();

        Console.WriteLine(s1.ElapsedMilliseconds);

    }

    [System.Runtime.CompilerServices.MethodImpl(

        System.Runtime.CompilerServices.MethodImplOptions.NoInlining |

        System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]

    public static int CallStruct(IShape s, int a, int b) {

        return s.Do(a, b);

    }

    [System.Runtime.CompilerServices.MethodImpl(

        System.Runtime.CompilerServices.MethodImplOptions.NoInlining |

        System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]

    public static int CallVirtual(AbstractShape s, int a, int b) {

        return s.AbstractDo(a, b);

    }

}

​

public abstract class AbstractShape {

​

    public abstract int AbstractDo(int a, int b);

}

​

public struct Rectangle: IShape {

    [System.Runtime.CompilerServices.MethodImpl(

        System.Runtime.CompilerServices.MethodImplOptions.NoInlining |

        System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]

    public int Do(int a, int b) {

        return a * b;

    }

}

​

public class Circle: AbstractShape {

    [System.Runtime.CompilerServices.MethodImpl(

        System.Runtime.CompilerServices.MethodImplOptions.NoInlining |

        System.Runtime.CompilerServices.MethodImplOptions.NoOptimization)]

    public override int AbstractDo(int a, int b) {

        return a * b;

    }

}

​

public interface IShape {

    int Do(int a, int b);

}