OneDriveException”；resyncRequired”；分别同步来自两个子文件夹的更改时

我在使用view.delta从OneDrive同步更改时遇到问题(https://dev.onedrive.com/items/view_delta.htm)在两个不同的子文件夹中。我正在使用OneDrive API SDK（C#）。

我在OneDrive上的文件夹结构如下：

appFolder/data/folder1

appFolder/data/folder2

由于某些特定的原因，我想分别跟踪这两个子文件夹folder1和folder2上的更改，所以我使用两个不同的增量标记，每个子文件夹一个。

问题是，当其他子文件夹（如folder1）发生更改（添加/删除文件）时，对该文件夹调用"view.delta"可以正常工作，但使用自己的令牌对另一个子文件夹调用view.delta会导致OneDriveException resyncRequired，尽管该文件夹没有任何更改。

在OneDrive（而不是OneDrive for Business）上跟踪多个文件夹的更改是否存在一些问题/限制？

重现问题的示例代码：

    static async Task Test(IOneDriveClient client)
    {
        var drive = client.Drive;
        // get app folder
        var appFolder = await drive.Special.AppRoot.Request().GetAsync();
        // create data folder under the app folder
        var dataFolder = await drive.Items[appFolder.Id].Children.Request().AddAsync(new Item { Name = "data", Folder = new Folder() });
        // create two subfolders folder1 and folder2 under the data folder
        var folder1 = await drive.Items[dataFolder.Id].Children.Request().AddAsync(new Item { Name = "folder1", Folder = new Folder() });
        var folder2 = await drive.Items[dataFolder.Id].Children.Request().AddAsync(new Item { Name = "folder2", Folder = new Folder() });
        // get initial token for the folder1
        string token1 = null;
        var changedItems1 = await drive.Items[folder1.Id].Delta(token1).Request().GetAsync();
        token1 = changedItems1.Token;
        // upload some test files under the folder1
        var testFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///TestData/Document.txt"));
        await UploadFileAsync(client, folder1, testFile, "file1");
        await UploadFileAsync(client, folder1, testFile, "file2");
        // get updated token for the folder1
        changedItems1 = await drive.Items[folder1.Id].Delta(token1).Request().GetAsync();
        token1 = changedItems1.Token;
        // get initial token for the folder2
        string token2 = null;
        var changedItems2 = await drive.Items[folder2.Id].Delta(token2).Request().GetAsync();
        token2 = changedItems2.Token;
        // now make some change under the folder1 (upload, delete)
        await UploadFileAsync(client, folder1, testFile, "file3");
        // get updated token for the folder1, this works ok
        changedItems1 = await drive.Items[folder1.Id].Delta(token1).Request().GetAsync();
        token1 = changedItems1.Token;
        try
        {
            // try to get changes for the folder2, this throws OneDriveException
            changedItems2 = await drive.Items[folder2.Id].Delta(token2).Request().GetAsync();
            token2 = changedItems2.Token;
        }
        catch (Exception ex)
        {
            // Exception is thrown with the following message:
            // "Resync required. Upload any local items that the service did not return, and upload any files that differ from the server's version (keeping both copies if you're not sure which one is more up-to-date)."
        }
    }
    static async Task UploadFileAsync(IOneDriveClient client, Item destinationFolder, IStorageFile file, string fileName)
    {
        using (var stream = await file.OpenStreamForReadAsync())
        {
            var item = await client.Drive.Items[destinationFolder.Id].ItemWithPath(fileName).Content.Request().PutAsync<Item>(stream);
        }
    }