/// <summary>
/// Searches the list of registered <see cref="IManager"/> instances for the specified instance and returns a value
/// indicating whether it was found.
/// </summary>
/// <typeparam name="T">The Manager Type to check.</typeparam>
/// <returns>A value indicating whether the specified Manager has been registered.</returns>
private bool IsManagerRegistered <T>()
where T : IManager
{
return(ManagerInstances.OfType <T>().Count() > 0);
}
/// <summary>
/// Returns the Manager from the list of Managers matching the specified Type.
/// </summary>
/// <typeparam name="T">The Type of the Manager to return.</typeparam>
/// <returns>The requested Manager.</returns>
public T GetManager <T>()
where T : IManager
{
return(ManagerInstances.OfType <T>().FirstOrDefault());
}