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);