public Guid AddByHandle(int handle)
{
var element = new Element(handle);
return Add(element);
}
public ListItemElement(Element listElement, int index)
{
_listElement = listElement;
_index = index;
}
public Guid Add(Element element)
{
var key = Guid.NewGuid();
_cache.AddOrUpdate(key, element, (x, oldValue) => element);
return key;
}