Question

I am trying to create instances of internal classes that are in the same assembly as the calling class. Unfortunately, this is not working for me. I’m using the following code snippet:

Assembly businessAssembly = this.GetType().Assembly;
var concreteValidator = businessAssembly.CreateInstance(t.NotificationType.ValidatorClassName, true,
    BindingFlags.Default | BindingFlags.CreateInstance | BindingFlags.Instance | BindingFlags.NonPublic, 
    null, 
    new Object[] { t }, 
    null, 
    null);

Note that t.NotificationType.ValidatorClassName is in the form Namespace.ClassName.
Shouldn’t that do the job? Where did I go wrong?

Answer 1

If the class is public internal and the constructor is public, then the CreateInstance method is missing the public binding flag:

BindingFlags.Public

Which would become:

Assembly businessAssembly = this.GetType().Assembly;
var concreteValidator = businessAssembly.CreateInstance(t.NotificationType.ValidatorClassName, true,
    BindingFlags.Default | BindingFlags.CreateInstance | BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public, 
    null, 
    new Object[] { t }, 
    null, 
    null);