public void UpdateOneRP(Guid id, float r, Point p)
{
var cell = Cells.GetOrAdd(id, CellItem.Create(r, p));
cell.R = r;
cell.Position = p;
Cells[id] = cell;
}
public Guid AddOne(CellItem item)
{
return(Cells.AddOrUpdate(item.Id, item, (id, newItem) => item).Id);
}