reateObjWithInvoike

CreateObjWithInvoike.cs

class Program
{
    public static void Main()
    {
        var ctor = typeof (R).GetConstructor(new Type[] {typeof (string)});

        var result = (R)ctor.Invoke(new object[]{"a"});
        result.Test();
    }

}

public class R
{
    public R(string stuff)
    {            
    }

    private string _test = "test";
    
    public void Test()
    {            
        Console.WriteLine(_test);
    }
}