Activator.CreateInstance with optional parameters

Question

Does anyone know how to instantiate a class using a constructor which has just 1 parameter that is optional?

I've tried both

(T)Activator.CreateInstance(typeof(T), new object[] { Type.Missing });

and

(T)Activator.CreateInstance(typeof(T), new object[] { });

To no success... I'm getting MissingMethodException

Answer 1

This worked:

(T)Activator.CreateInstance(typeof(T), 
                    BindingFlags.CreateInstance |
                    BindingFlags.Public |
                    BindingFlags.Instance | 
                    BindingFlags.OptionalParamBinding,null, new object[] {Type.Missing },CultureInfo.CurrentCulture);