public static class EventUtilities
{
  public static Delegate[] GetInvocationList(string eventName, object obj)
  {
    bool success;
    var result = TryGetInvocationList(eventName, obj, out success);
    if (success)
    { return result; }
    else
    { throw new InvalidOperationException(); }
  }

  public static Delegate[] TryGetInvocationList(string eventName, object obj,
      out bool success)
  {
    success = false;

    if (obj == null)
    { throw new ArgumentNullException("obj"); }

    if (eventName == null)
    { throw new ArgumentNullException("eventName"); }

    var field = GetField(eventName, obj.GetType());
    if (field == null)
    { return null; }

    success = true;
    var mDel = field.GetValue(obj) as MulticastDelegate;

    if (mDel == null)
    { return null; }
    else
    { return mDel.GetInvocationList(); }
  }

  public static bool ClearInvocationList(string eventName, object obj)
  {
    if (obj == null)
    { throw new ArgumentNullException("obj"); }

    if (eventName == null)
    { throw new ArgumentNullException("eventName"); }

    var field = GetField(eventName, obj.GetType());

    if (field == null)
    { return false; }

    field.SetValue(obj, null);
    return true;
  }

  private static FieldInfo GetField(string eventName, Type type)
  {
    var field = type.GetField(eventName, BindingFlags.Instance | 
      BindingFlags.NonPublic | BindingFlags.FlattenHierarchy | BindingFlags.Public);

    if (field == null)
    { return null; }

    if (field.FieldType == typeof(MulticastDelegate))
    { return field; }

    if(field.FieldType.IsSubclassOf(typeof(MulticastDelegate)))
    { return field; }

    return null;
  }
}