private PageAndSubIndex EnsureCurrentPage(int index)
{
var pageAndSubIndex = new PageAndSubIndex(index / _pageSize, index % _pageSize);
if (_currentPage == null || _currentPage.PageIndex != pageAndSubIndex.PageIndex)
{
_currentPage = _allocatedPages.GetOrCreatePage(pageAndSubIndex.PageIndex);
}
return(pageAndSubIndex);
}
public void RemoveRange(int firstIndex, int count)
{
var firstItem = new PageAndSubIndex(firstIndex / _pageSize, firstIndex % _pageSize);
if (firstItem.SubIndex + count > _pageSize)
{
throw new NotImplementedException("RemoveRange is only implemented to work within page boundaries");
}
if (_allocatedPages.Contains(firstItem.PageIndex))
{
if (_allocatedPages[firstItem.PageIndex].Trim(firstItem.SubIndex, count))
{
_allocatedPages.Remove(firstItem.PageIndex);
}
}
}