VB.NET needs Iterators

VB.NET needs Iterators

Just reading through the RSS sample I mentioned in my previous post on the Windows RSS Platform and noticed that they are using one of the new C# features in .NET v2, Iterators.  Anyhow the code snippet I’m referring to is:

public static IEnumerable<IFeed> CommonFeedList(IFeedFolder folder)
  
{
      Queue<IFeedFolder> queue = new Queue<IFeedFolder>();
      queue.Enqueue(folder);
      while (queue.Count > 0)
      {
         IFeedFolder currentFolder = queue.Dequeue();
         foreach (IFeedFolder subfolder in (IFeedsEnum)currentFolder.Subfolders)
            queue.Enqueue(subfolder);

         foreach (IFeed feed in (IFeedsEnum)currentFolder.Feeds)
         {
            System.Windows.Forms.Application.DoEvents();
            yield return feed;
         }
      }
   }

While not the most elegant piece of code (especially the explicit call to “DoEvents”) it got me thinking about how I would do this in VB.  The long answer is that you need to code the full iterator yourself.  Please, please, please VB team can we have iterators?

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