Microsoft Graph CSharp SDK - 获取 DriveItems - 分页不起作用，只能检索 1000 个项目中的 200 个项目

Question

我正在针对 Microsoft Graph CSharp SDK 进行编码，同时测试我的大规模收集应用程序。我注意到我的代码存在分页问题。我将 1000 个 1kb 文件添加到一个测试 OneDrive 帐户 - 然后我运行我的代码反对看我是否可以访问所有文件。不幸的是，我只能在一个文件夹中看到 200 个文件 - 而不是完整的 1000 个文件。

我在网上查了一下，发现这个 GitHub（现已关闭）bug。

在单步执行我的代码时，我看到 NextPageRequest 是 null。我只是想确保没有错误并确保我正确使用 NextPageRequest.

代码：

public Collection<DriveItem> GetSubItems(string id, string username)
{
    Collection<DriveItem> response = new Collection<DriveItem>();
    var retryCount = 0;

    try
    {

        response = RetryPolicy.Default.Retry<Exception, Collection<DriveItem>>(
        this.maxRetryCount,
        RetryDurationStrategies.ExponentialBackoff,
        (exception, timeSpan) =>
        {
            retryCount++;
            this.LogInfo(Strings.RetryPolicyMessage, exception.Message, timeSpan);
        },
        () =>
        {
            var driveItems = new List<DriveItem>();
            var driveItemsPage = this.GraphServiceClient.GetItemAndChildrenTask(id, username);
            var result = driveItemsPage.Result;
            driveItems.AddRange(result.Children.CurrentPage);

            while (result.Children.NextPageRequest != null)
            {
                var nextPageResult = result.Children.NextPageRequest.GetAsync();
                var nextPage = nextPageResult.Result;
                driveItems.AddRange(nextPage.CurrentPage);
            }

            Collection<DriveItem> driveItemsList = new Collection<DriveItem>(driveItems);

            return driveItemsList;
        });
    }
    catch (ServiceException ex)
    {
        switch (ex.Error.Code)
        {
            case ItemNotFound:
                this.LogWarning(ex, Strings.OneDriveItemNotFound, ex.Message);
                break;
            case InvalidRequestItemId:
                this.LogWarning(ex, Strings.OneDriveUserNotFound, ex.Message);
                break;
            default:
                this.LogWarning(ex, Strings.OneDriveGenericException, ex.Message);
                break;
        }
    }
    catch (AdalServiceException ex)
    {
        switch (ex.ErrorCode)
        {
            case InvalidClient:
                this.LogWarning(ex, Strings.AdalInvalidClientErrorMsg, ex.Message);
                break;
            case UnauthorizedClient:
                this.LogWarning(ex, Strings.AdalUnauthorizedClientErrorMsg, ex.Message);
                break;
            case InvalidRequestSecret:
                this.LogWarning(ex, Strings.AdalInvalidRequestErrorMsg, ex.Message);
                break;
            default:
                this.LogWarning(ex, Strings.AdalGenericErrorMsg, ex.Message);
                break;
        }

        throw new PluginException(string.Format(Strings.AuthenticationToOneDriveWasUnsuccessful, ex.Message), ex.InnerException);
    }
    catch (Exception ex)
    {
        this.LogWarning(ex, Strings.OneDriveGenericException, ex.Message);

        throw new PluginException(Strings.GenericPluginException, ex.InnerException);
    }

    return response;
}

对Microsoft Graph SDK的调用：

public Task<DriveItem> GetItemAndChildrenTask(string id, string username)
{
    return this.GraphServiceClient.Drives[username].Items[id].Request().Expand(ExpandValue).GetAsync();
}

下面是 result 变量的屏幕截图：

Answer 1

您的基础图形请求需要专门针对子项进行，以使 NextPageRequest 不为空。

graphServiceClient.Drives[username].Items[id].Children.Request().GetAsync();

如果你这样做：

graphServiceClient.Drives[username].Items[id].Request().Expand('children').GetAsync();

那么 NextPageRequest 将不会被填充。

Microsoft Graph CSharp SDK - 获取 DriveItems - 分页不起作用，只能检索 1000 个项目中的 200 个项目

Microsoft Graph CSharp SDK - Fetching DriveItems- paging not working, only able to retrieve 200 items out of 1000 items

c#

onedrive

microsoft-graph-api