internal void AddToChild(ParentOneChild_Child parentOneChild_Child)
{
#if DEBUG
if (parentOneChild_Child == ParentOneChild_Child.NoParentOneChild_Child)
{
throw new Exception();
}
if ((parentOneChild_Child.Key >= 0) && (Key < 0))
{
throw new Exception();
}
if (Child == parentOneChild_Child)
{
throw new Exception();
}
#endif
if (Child != null)
{
throw new Exception($"ParentOneChild_Parent.AddToChild(): '{Child}' is already assigned to Child, it is not possible to assign now '{parentOneChild_Child}'.");
}
Child = parentOneChild_Child;
onAddedToChild(parentOneChild_Child);
#if DEBUG
DC.Trace?.Invoke($"Add ParentOneChild_Child {parentOneChild_Child.GetKeyOrHash()} to " +
$"{this.GetKeyOrHash()} ParentOneChild_Parent.Child");
#endif
}
internal void RemoveFromChild(ParentOneChild_Child parentOneChild_Child)
{
#if DEBUG
if (Child != parentOneChild_Child)
{
throw new Exception($"ParentOneChild_Parent.RemoveFromChild(): Child does not link to parentOneChild_Child '{parentOneChild_Child}' but '{Child}'.");
}
#endif
Child = null;
onRemovedFromChild(parentOneChild_Child);
#if DEBUG
DC.Trace?.Invoke($"Remove ParentOneChild_Child {parentOneChild_Child.GetKeyOrHash()} from " +
$"{this.GetKeyOrHash()} ParentOneChild_Parent.Child");
#endif
}