ProblemWithActivator.cs

public class ImplicitTest
{
    public double Val { get; set; }

    public ImplicitTest(double Val)
    {
        this.Val = Val;
    }

    public static implicit operator int(ImplicitTest d)
    {
        return (int)d.Val;
    }
}

public class TestClass
{
    public int Val { get; set; }        

    public TestClass(int Val)
    {
        this.Val = Val;
    }
}

public class MainClass
{
    public static void Main()
    {
        //Valid
        new TestClass(5);
        
        //Valid
        new TestClass(new ImplicitTest(5.1));
        
        //Valid
        Activator.CreateInstance(Type.GetType("ThisNamespace.TestClass"), 5); 
        
        //Invalid, throws System.MissingMethodException, this is my problem
        Activator.CreateInstance(Type.GetType("ThisNamespace.TestClass"), new ImplicitTest(5.1));
    }
}