/// <summary>
/// Intersection
/// </summary>
/// <param name="value"></param>
public override void Multiply(BaseType value)
{
var valueSet = value.ToSet();
rep.RemoveAll(x => !valueSet.Contains(x));
OnChanged();
}
/// <summary>
/// Union
/// </summary>
/// <param name="value"></param>
public override void Add(BaseType value)
{
rep.AddRange(value.ToSet().AsEnumerable().Where(x => !Contains(x)));
OnChanged();
}