longpoll api returns always true when I added shared folder to my drive

I'm sorry for the short English. I used Google Translator

I have read dropbox documents very deeply again on this issue.

If I use get_lastest_cursor and longpoll to get changes only, I'm using it wrong.

I realized I could get a Delta using the "list_folder/continue" call.

So, I came to understand the relationship between Cursor and Delta in turn.

I've found that it works well only with a good understanding of the behavior of get_lastest_cursor, longpoll, and list_folder/continue.

After modifying the code, it works fine now.

For someone like me, leave the reference code below.

Thanks Greg K.

void CheckChanges()
{
	string LastCursor = String.Empty;

	// first step : get new cursor and keep
	Task task = Task.Run(async () =>
	{
		ListFolderArg arg = new ListFolderArg("", true, false, true, false);
		var result = await Client.Files.ListFolderGetLatestCursorAsync(arg);
		LastCursor = result.Cursor;
	});
	task.Wait();

	// loop : detect changes and get delta
	while(!EndOfCheck)
	{
		bool doGetDelta = false;
		Task task = Task.Run(async () =>
		{
			try
			{
				var longpoll = await Client.Files.ListFolderLongpollAsync(PathFile.Cursor);

				doGetDelta = longpoll.Changes;
			}
			catch
			{
			}
		});
		task.Wait();

		if(doGetDelta)
		{
			List<MyChangeInfo> changeList = new List<MyChangeInfo>();
			ListFolderContinueArg arg = new ListFolderContinueArg(LastChangeCursor);
			Task task = Task.Run(async () =>
			{
				try
				{
					var continueResult = await Client.Files.ListFolderContinueAsync(arg);
					LastChangeCursor = continueResult.Cursor; // keep cursor
					if (continueResult.Entries != null && continueResult.Entries.Count > 0)
					{
						foreach (var entry in continueResult.Entries)
						{
							MyChangeInfo change = new MyChangeInfo();
							change.key = entry.PathLower;
							change.metadata = entry;
							change.removed = entry.IsDeleted;
							changeList.Add(change);
						}
					}
				}
				catch
				{
				}
			});
			task.Wait();

			if(newList.Count > 0)
			{
				// Do Apply Changes
				foreach(var change in newList)
				{
					if(change.removed)
					{
					// do delete file or folder
					}
					else
					{
					// do update or add
					}
				}
			}
		}
	}
}