C# Blob.BlobContinuationToken类代码示例

 public BlobResultSegment ListBlobsSegmented(string prefix, bool useFlatListing, BlobListingDetails blobListingDetails,
     int? maxResults, BlobContinuationToken continuationToken, BlobRequestOptions blobRequestOptions,
     OperationContext operationContext)
 {
     return _client.ListBlobsSegmented(prefix, useFlatListing, blobListingDetails, maxResults, continuationToken,
         blobRequestOptions, operationContext);
 }

        private BlobResultSegment GetNextHeartbeats(CloudBlobDirectory directory, BlobContinuationToken currentToken)
        {
            const int batchSize = 100;

            try
            {
                return directory.ListBlobsSegmented(useFlatBlobListing: true,
                    blobListingDetails: BlobListingDetails.None,
                    maxResults: batchSize,
                    currentToken: currentToken,
                    options: null,
                    operationContext: null);
            }
            catch (StorageException exception)
            {
                if (exception.IsNotFound())
                {
                    return null;
                }
                else
                {
                    throw;
                }
            }
        }

 private Task<ContainerResultSegment> ListContainersSegmented(string prefix, ContainerListingDetails detailsIncluded, int? maxResults, BlobContinuationToken continuationToken, BlobRequestOptions options, OperationContext operationContext, CancellationToken cancellationToken = default(CancellationToken))
 {
     return AsyncTaskUtil.RunAsyncCancellable<ContainerResultSegment>(
         _inner.BeginListContainersSegmented(prefix, detailsIncluded, maxResults, continuationToken, options, operationContext, null, null),
         _inner.EndListContainersSegmented,
         cancellationToken);
 }

        public static IAzureBlobResultSegment ListBlobsSegmentedAsync(
            string containerDirectory,
            string searchDirectory,
            string prefix,
            BlobListing blobListing,
            BlobListingDetails blobListingDetails,
            int? maxResults,
            BlobContinuationToken currentToken)
        {
            if (blobListing == BlobListing.Hierarchical && (blobListingDetails & BlobListingDetails.Snapshots) == BlobListingDetails.Snapshots)
            {
                throw new ArgumentException("Listing snapshots is only supported in flat mode.");
            }

            var numberToSkip = DetermineNumberToSkip(currentToken);

            var resultSegment = blobListing == BlobListing.Flat
                ? FindFilesFlattened(containerDirectory, searchDirectory, prefix, maxResults, numberToSkip)
                : FindFilesHierarchical(containerDirectory, searchDirectory, prefix, maxResults, numberToSkip);

            if ((blobListingDetails & BlobListingDetails.Metadata) == BlobListingDetails.Metadata)
            {
                foreach (var blob in resultSegment.Results.OfType<StandaloneAzureBlockBlob>())
                {
                    blob.FetchAttributes();
                }
            }

            return resultSegment;
        }

        /// <summary>
        ///     Returns an enumerable collection of the blobs in the container that are retrieved asynchronously.
        /// </summary>
        /// <param name="blobDirectory">Cloud blob directory.</param>
        /// <param name="cloudBlobs">List of cloud blobs.</param>
        /// <param name="useFlatBlobListing">Whether to list blobs in a flat listing, or whether to list blobs hierarchically, by virtual directory.</param>
        /// <param name="blobListingDetails">
        ///     A <see cref="T:Microsoft.WindowsAzure.Storage.Blob.BlobListingDetails" /> enumeration describing which items to include in the listing.
        /// </param>
        /// <param name="maxResults">
        ///     A non-negative integer value that indicates the maximum number of results to be returned at a time, up to the
        ///     per-operation limit of 5000. If this value is null, the maximum possible number of results will be returned, up to 5000.
        /// </param>
        /// <param name="continuationToken">Continuation token.</param>
        /// <param name="cancellationToken">Cancellation token.</param>
        /// <returns>
        ///     An enumerable collection of objects that implement <see cref="T:Microsoft.WindowsAzure.Storage.Blob.IListBlobItem" /> that are retrieved.
        /// </returns>
        private static Task<List<IListBlobItem>> ListBlobsImplAsync(
            this CloudBlobDirectory blobDirectory,
            List<IListBlobItem> cloudBlobs,
            bool useFlatBlobListing,
            BlobListingDetails blobListingDetails,
            int? maxResults,
            BlobContinuationToken continuationToken,
            CancellationToken cancellationToken = default (CancellationToken))
        {
            return blobDirectory
                .ListBlobsSegmentedAsync(useFlatBlobListing, blobListingDetails, maxResults, continuationToken, cancellationToken)
                .Then(result =>
                    {
                        cancellationToken.ThrowIfCancellationRequested();

                        cloudBlobs.AddRange(result.Results);

                        // Checks whether maxresults entities has been received
                        if (maxResults.HasValue && cloudBlobs.Count >= maxResults.Value)
                        {
                            return TaskHelpers.FromResult(cloudBlobs.Take(maxResults.Value).ToList());
                        }

                        // Checks whether enumeration has been completed
                        if (result.ContinuationToken != null)
                        {
                            return ListBlobsImplAsync(blobDirectory, cloudBlobs, useFlatBlobListing, blobListingDetails, maxResults, continuationToken, cancellationToken);
                        }

                        return TaskHelpers.FromResult(cloudBlobs);
                    });
        }

 private Task<BlobResultSegment> ListBlobsSegmented(string prefix, bool useFlatBlobListing, BlobListingDetails blobListingDetails, int? maxResults, BlobContinuationToken continuationToken, BlobRequestOptions options, OperationContext operationContext, CancellationToken cancellationToken = default(CancellationToken))
 {
     return AsyncTaskUtil.RunAsyncCancellable<BlobResultSegment>(
         _inner.BeginListBlobsSegmented(prefix, useFlatBlobListing, blobListingDetails, maxResults, continuationToken, options, operationContext, null, null),
         _inner.EndListBlobsSegmented,
         cancellationToken);
 }

 /// <inheritdoc />
 public Task<IStorageBlobResultSegment> ListBlobsSegmentedAsync(string prefix, bool useFlatBlobListing,
     BlobListingDetails blobListingDetails, int? maxResults, BlobContinuationToken currentToken,
     BlobRequestOptions options, OperationContext operationContext, CancellationToken cancellationToken)
 {
     Task<BlobResultSegment> sdkTask = _sdk.ListBlobsSegmentedAsync(prefix, useFlatBlobListing,
         blobListingDetails, maxResults, currentToken, options, operationContext, cancellationToken);
     return ListBlobsSegmentedAsyncCore(sdkTask);
 }

 public async Task<IAzureBlobResultSegment> ListBlobsSegmentedAsync(BlobListing blobListing, BlobListingDetails blobListingDetails, int? maxResults, BlobContinuationToken currentToken)
 {
     return new HostedAzureBlobResultSegment(await _cloudBlobDirectory.ListBlobsSegmentedAsync(
         blobListing == BlobListing.Flat,
         blobListingDetails,
         maxResults,
         currentToken,
         null,
         null));
 }

        private static int DetermineNumberToSkip(BlobContinuationToken currentToken)
        {
            if (currentToken == null)
            {
                return 0;
            }

            int numberToSkip;
            return Int32.TryParse(currentToken.NextMarker, out numberToSkip) ? numberToSkip : 0;
        }

 public Task<IAzureBlobResultSegment> ListBlobsSegmentedAsync(BlobListing blobListing, BlobListingDetails blobListingDetails, int? maxResults, BlobContinuationToken currentToken)
 {
     return Task.FromResult(StandaloneList.ListBlobsSegmentedAsync(
         _containerDirectory,
         _directoryPath,
         "",
         blobListing,
         blobListingDetails,
         maxResults,
         currentToken));
 }

 public StandaloneAzureBlobResultSegment(IEnumerable<IAzureListBlobItem> results, BlobContinuationToken continuationToken)
 {
     if (results == null)
     {
         throw new ArgumentNullException("results");
     }
     if (continuationToken == null)
     {
         throw new ArgumentNullException("continuationToken");
     }
     Results = results;
     ContinuationToken = continuationToken;
 }

        public Task<IAzureBlobResultSegment> ListBlobsSegmentedAsync(string prefix, BlobListing blobListing, BlobListingDetails blobListingDetails, int? maxResults, BlobContinuationToken currentToken)
        {
            if (blobListing == BlobListing.Hierarchical && (blobListingDetails & BlobListingDetails.Snapshots) == BlobListingDetails.Snapshots)
            {
                throw new ArgumentException("Listing snapshots is only supported in flat mode.");
            }

            var numberToSkip = DetermineNumberToSkip(currentToken);

            var resultSegment = blobListing == BlobListing.Flat
                ? FindFilesFlattened(prefix, maxResults, numberToSkip)
                : FindFilesHierarchical(prefix, maxResults, numberToSkip);

            return Task.FromResult((IAzureBlobResultSegment) resultSegment);
        }

        public static string Serialize(BlobContinuationToken token)
        {
            if (token == null)
            {
                return null;
            }

            // Include TargetLocation in serialized form to ensure consistent results for RA-GRS accounts. (Without it,
            // each request could see different sides of eventually consisent replication).
            // See: http://blogs.msdn.com/b/windowsazurestorage/archive/2013/12/04/ (ignore source line break)
            // introducing-read-access-geo-replicated-storage-ra-grs-for-windows-azure-storage.aspx

            // Prefix the NextMarker with a single character indicating TargetLocation.
            return Serialize(token.TargetLocation) + token.NextMarker;
        }

        public IObservable<AsyncCloudBlobContainer> ListContainers(string prefix, ContainerListingDetails detailsIncluded, int? maxResults, BlobRequestOptions options, OperationContext operationContext)
        {
            return Observable.Create<AsyncCloudBlobContainer>(
            async (observer, ct) =>
            {
                var containerToken = new BlobContinuationToken();
                while (containerToken != null)
                {
                    var results = await ListContainersSegmented(prefix, detailsIncluded, maxResults, containerToken, options, operationContext, ct);
                    foreach (var result in results.Results)
                    {
                        observer.OnNext(new AsyncCloudBlobContainer(result));
                    }

                    containerToken = results.ContinuationToken;
                }
            });
        }

        public IObservable<IAsyncListBlobItem> ListBlobs(string prefix, bool useFlatBlobListing, BlobListingDetails blobListingDetails = BlobListingDetails.None, int? maxResults = null, BlobRequestOptions options = null, OperationContext operationContext = null)
        {
            return Observable.Create<IAsyncListBlobItem>(
            async (observer, ct) =>
            {
                var containerToken = new BlobContinuationToken();
                while (containerToken != null)
                {
                    var results = await ListBlobsSegmented(prefix, useFlatBlobListing, blobListingDetails, maxResults, containerToken, options, operationContext, ct);
                    foreach (var result in results.Results)
                    {
                        observer.OnNext(AsyncListBlobItemHelpers.FromIListBlobItem(result));
                    }

                    containerToken = results.ContinuationToken;
                }
            });
        }