b.cs

b.cs

using System;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Threading;

public interface IInterface1 { IInterface2 GetInterface(); }
public interface IInterface2 { IInterface3 GetInterface(); }
public interface IInterface3 { IInterface4 GetInterface(); }
public interface IInterface4 { void SayHello(); }

public class Class1 : IInterface1
{
    public static readonly Class1 Instance = new();
    public IInterface2 GetInterface() => Class2.Instance;
}
public class Class2 : IInterface2
{
    public static readonly Class2 Instance = new();
    public IInterface3 GetInterface() => Class3.Instance;
}
public class Class3 : IInterface3
{
    public static readonly Class3 Instance = new();
    public IInterface4 GetInterface() => Class4.Instance;
}
public class Class4 : IInterface4
{
    public static readonly Class4 Instance = new();
    public void SayHello(){}
}

public class Program
{
    public static void Main()
    {
        // warm up:
        for (int i = 0; i < 50; i++)
        {
            SayHello(Class1.Instance);
            Thread.Sleep(16);
        }

        var sw = Stopwatch.StartNew();
        while (true)
        {
            sw.Restart();
            for (int i = 0; i < 10000000; i++)
                SayHello(Class1.Instance);
            sw.Stop();

            Console.WriteLine(sw.ElapsedMilliseconds);
        }
    }

    [MethodImpl(MethodImplOptions.NoInlining)]
    static void SayHello(IInterface1? i) => 
        i?.GetInterface()?.GetInterface()?.GetInterface()?.SayHello();
}







using System;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Threading;

public class IInterface1 { public virtual IInterface2 GetInterface() => null; }
public class IInterface2 { public virtual IInterface3 GetInterface() => null; }
public class IInterface3 { public virtual IInterface4 GetInterface() => null; };
public class IInterface4 { public virtual void SayHello() {} }

public class Class1 : IInterface1
{
    public static readonly Class1 Instance = new();
    public override IInterface2 GetInterface() => Class2.Instance;
}
public class Class2 : IInterface2
{
    public static readonly Class2 Instance = new();
    public override IInterface3 GetInterface() => Class3.Instance;
}
public class Class3 : IInterface3
{
    public static readonly Class3 Instance = new();
    public override IInterface4 GetInterface() => Class4.Instance;
}
public class Class4 : IInterface4
{
    public static readonly Class4 Instance = new();
    public override void SayHello() { }
}

public class Program
{
    public static void Main()
    {
        // warm up:
        for (int i = 0; i < 50; i++)
        {
            SayHello(Class1.Instance);
            Thread.Sleep(16);
        }

        var sw = Stopwatch.StartNew();
        while (true)
        {
            sw.Restart();
            for (int i = 0; i < 10000000; i++)
                SayHello(Class1.Instance);
            sw.Stop();

            Console.WriteLine(sw.ElapsedMilliseconds);
        }
    }

    [MethodImpl(MethodImplOptions.NoInlining)]
    static void SayHello(IInterface1? i) =>
        i?.GetInterface()?.GetInterface()?.GetInterface()?.SayHello();
}