public static List <T> Set <T>() where T : class
{
if (typeof(T) == typeof(Building))
{
return((List <T>)Buildings.Cast <T>());
}
if (typeof(T) == typeof(Room))
{
return((List <T>)Rooms.Cast <T>());
}
if (typeof(T) == typeof(Router))
{
return((List <T>)Routers.Cast <T>());
}
if (typeof(T) == typeof(Computer))
{
return((List <T>)Computers.Cast <T>());
}
return(null);
}