using System;

using System.Reflection;

​

#nullable enable

​

public static class Extensions {

    public static MethodInfo? GetMethodBetter(this Type t, string name)

        => (

            t.GetMethod(name, BindingFlags.Instance|BindingFlags.Public|BindingFlags.NonPublic) ??

            t.GetMethod(name, BindingFlags.Static|BindingFlags.Public|BindingFlags.NonPublic)

        );

    public static object? InvokeCoolMethod(this Type t, string name, object obj = null, params object[] parameters) {

        var method = GetMethodBetter(t, name);

        if (method is null) throw new Exception("method not found");

        return method.Invoke(obj, parameters);

    }

}

​

public class Program {

    public static void Main() {

        Console.WriteLine("Hello World");

​

        var program = new Program();

        program.SetProperty("a", 123);

        program.SetProperty("b", 123.45);

        program.SetProperty("cool_shit", "this is neato");

        //program.SetProperty("not_a_property", null);

        Console.WriteLine("Bye World");

    }

    void SetProperty(string name, object value) {

        GetType().InvokeCoolMethod($"_SetProperty_{name}", this, value);

    }

    void _SetProperty_a(int arg) { Console.WriteLine($"\tset property a with: {arg}"); }

    void _SetProperty_b(double arg) { Console.WriteLine($"\tset property b with: {arg}"); }

    void _SetProperty_cool_shit(string arg) { Console.WriteLine($"\tset property cool shit with: \"{arg}\""); }

}

​