.NET: Get all classes derived from specific class

Question

I have a custom control and a number of controls derived from it. I need to get all classes in the current assembly that are derived from the main class and check their attributes. How to accomplish this?

Answer 1

var type = typeof(MainClass);

var listOfDerivedClasses = Assembly.GetExecutingAssembly()
    .GetTypes()
    .Where(x => x.IsSubclassOf(type))
    .ToList();

foreach (var derived in listOfDerivedClasses)
{
   var attributes = derived.GetCustomAttributes(typeof(TheAttribute), true);

   // etc.
}