Question

I am given the error

“The type or namespace name ‘passedType’ could not be found (are you missing a using directive or an assembly reference?)”

on the two references to passedType inside the function. Why does it not recognize the “passedType” variable?

public bool ObjectIsInHighlightedList(object thing, Type passedType)
{
  foreach (object obj in _highlightedList)
  {
     if (obj is passedType && thing == (passedType)obj)
        return true;
  }
} 

Answer 1

Try using the IsAssignableFrom method.

public bool ObjectIsInHighlightedList(object thing, Type passedType)
{
  foreach (object obj in _highlightedList)
  {
     if (passedType.IsAssignableFrom(obj.GetType()) && (object)thing == obj)
        return true;
  }
}

This would actually be a good scenario for a generic method, however:

public bool ObjectIsInHighlightedList<T>(object thing)
{
  foreach (object obj in _highlightedList)
  {
     if (obj is T && thing == (T)obj)
        return true;
  }
}