c# – 我可以将这个do-while循环重写为foreach循环吗？

有没有办法用foreach循环更优雅地编写这段代码？ “创建新条目”逻辑阻碍了我,因为即使pendingEntries不包含任何项目,它也需要执行.

ItemDto itemToAdd; // an input parameter to the method
IEnumerator<Item> pendingEntries = existingPendingItems.GetEnumerator();
pendingEntries.MoveNext();
do // foreach entry
{
  Item entry = pendingEntries.Current;
  if (entry != null) // fold the itemToAdd into the existing entry
  {
    entry.Quantity += itemToAdd.Quantity; // amongst other things
  }
  else // create a new entry
  {
    entry = Mapper.Map<ItemDto,Item>(itemToAdd);
  }
  Save(entry);
} while (pendingEntries.MoveNext());

foreach (Item entry in existingPendingItems.DefaultIfEmpty())
{
    Item entryToSave;

    if (entry != null) // fold the itemToAdd into the existing entry
    {
        entry.Quantity += itemToAdd.Quantity; // amongst other things

        entryToSave = entry;
    }
    else // create a new entry
    {
        entryToSave = Mapper.Map<ItemDto,Item>(itemToAdd);
    }

    Save(entryToSave);
}