c# - DocumentDB 分页标记。不断获得 "wrong"一个

Question

我在使用延续标记时遇到问题。

我有 16 个文档，想一次获取 5 个。

这就是对所提供方法的请求现在的工作方式:1. 获取5，获取延续 token 。工作正常。我收到了 5 份文件。

使用延续 token 可获得 5 个以上新的延续 token 。工作正常。获取其他 5 份文件。

使用延续 token 再获得 5 个+新的延续 token 。获取与步骤 1 相同的结果集 + 与步骤 1 相同的延续标记。

并且它始终在这两组和相同的两个 token 之间交替。

这是代码。

public async Task<Tuple<List<AdDocument>,string,int>> QueryWithPagingAsync(string continuationToken)
    {
        List<AdDocument> ads = new List<AdDocument>();
        var totalAdsCount = await GetAdsCount();

        if (string.IsNullOrEmpty(continuationToken))
        {
            FeedOptions options = new FeedOptions { MaxItemCount = 5 };
            var query = Client.CreateDocumentQuery<AdDocument>(DocumentCollection.DocumentsLink, options).AsDocumentQuery();
            var feedResponse = await query.ExecuteNextAsync<AdDocument>();
            string continuation = feedResponse.ResponseContinuation;

            foreach (var ad in feedResponse.AsEnumerable().OrderBy(a => a.Id))
            {
                ads.Add(ad);
            }

            return new Tuple<List<AdDocument>, string, int>(ads, continuation, totalAdsCount);
        }
        else
        {
            FeedOptions options = new FeedOptions { MaxItemCount = 5, RequestContinuation = continuationToken };
            var query = Client.CreateDocumentQuery<AdDocument>(DocumentCollection.DocumentsLink, options).AsDocumentQuery();
            var feedResponse = await query.ExecuteNextAsync<AdDocument>();
            feedResponse = await query.ExecuteNextAsync<AdDocument>();
            string continuation = feedResponse.ResponseContinuation;

            foreach (var ad in feedResponse.AsEnumerable().OrderBy(a=>a.Id))
            {
                ads.Add(ad);
            }
            return new Tuple<List<AdDocument>, string, int>(ads, continuation, totalAdsCount);
        }

    }

Answer 1

所以我移动了“string continuation = feedResponse.ResponseContinuation;”到下面的执行，现在它可以工作了。

工作版本:

        public async Task<Tuple<List<AdDocument>,string,int>> QueryWithPagingAsync(string continuationToken)
    {
        List<AdDocument> ads = new List<AdDocument>();
        var totalAdsCount = await GetAdsCount();if (string.IsNullOrEmpty(continuationToken))
        {
            FeedOptions options = new FeedOptions { MaxItemCount = 5 };
            var query = Client.CreateDocumentQuery<AdDocument>(DocumentCollection.DocumentsLink, options).AsDocumentQuery();
            var feedResponse = await query.ExecuteNextAsync<AdDocument>();
                            foreach (var ad in feedResponse.AsEnumerable().OrderBy(a => a.Id))
            {
                ads.Add(ad);
            }

            string continuation = feedResponse.ResponseContinuation;
            return new Tuple<List<AdDocument>, string, int>(ads, continuation, totalAdsCount);
        }
        else
        {
            FeedOptions options = new FeedOptions { MaxItemCount = 5, RequestContinuation = continuationToken };
            var query = Client.CreateDocumentQuery<AdDocument>(DocumentCollection.DocumentsLink, options).AsDocumentQuery();
            var feedResponse = await query.ExecuteNextAsync<AdDocument>();

            foreach (var ad in feedResponse.AsEnumerable().OrderBy(a=>a.Id))
            {
                ads.Add(ad);
            }
            string continuation = feedResponse.ResponseContinuation;

            return new Tuple<List<AdDocument>, string, int>(ads, continuation, totalAdsCount);
        }

    }



public async Task<Tuple<List<AdDocument>,string,int>> QueryWithPagingAsync(string continuationToken)
    {
        List<AdDocument> ads = new List<AdDocument>();
        var totalAdsCount = await GetAdsCount();

        if (string.IsNullOrEmpty(continuationToken))
        {
            FeedOptions options = new FeedOptions { MaxItemCount = 5 };
            var query = Client.CreateDocumentQuery<AdDocument>(DocumentCollection.DocumentsLink, options).AsDocumentQuery();
            var feedResponse = await query.ExecuteNextAsync<AdDocument>();
                            foreach (var ad in feedResponse.AsEnumerable().OrderBy(a => a.Id))
            {
                ads.Add(ad);
            }

            string continuation = feedResponse.ResponseContinuation;
            return new Tuple<List<AdDocument>, string, int>(ads, continuation, totalAdsCount);
        }
        else
        {
            FeedOptions options = new FeedOptions { MaxItemCount = 5, RequestContinuation = continuationToken };
            var query = Client.CreateDocumentQuery<AdDocument>(DocumentCollection.DocumentsLink, options).AsDocumentQuery();
            var feedResponse = await query.ExecuteNextAsync<AdDocument>();

            foreach (var ad in feedResponse.AsEnumerable().OrderBy(a=>a.Id))
            {
                ads.Add(ad);
            }
            string continuation = feedResponse.ResponseContinuation;

            return new Tuple<List<AdDocument>, string, int>(ads, continuation, totalAdsCount);
        }

    }