如何获取具有子目录级别(n级)的Blob容器中的所有blob？

Question

尝试使用ListBlobsSegmentedAsync方法,但这只返回主父目录级别的blob.

但我需要从所有n级子目录中一次性获取整个blob列表.

BlobContinuationToken continuationToken = null;
bool useFlatBlobListing = true;
BlobListingDetails blobListingDetails = BlobListingDetails.None;
int maxBlobsPerRequest = 500;
var blobOptions = new BlobRequestOptions (true );

do
 {
    var listingResult = await cbDir.ListBlobsSegmentedAsync(useFlatBlobListing, blobListingDetails, maxBlobsPerRequest, continuationToken, null, null);
    continuationToken = listingResult.ContinuationToken;
    srcBlobList.AddRange(listingResult.Results);
 } while (continuationToken != null);

Answer 1

使用这种替代ListBlobsSegmentedAsync方法:https://msdn.microsoft.com/en-us/library/dn434672.aspx并确保你传递true的useFlatBlobListing参数.这将列出所有子目录中的所有blob.

UPDATE

这是我使用的代码,它返回该子文件夹中的blob以及该子文件夹中的所有子文件夹.

    /// <summary>
    /// Code to fetch blobs from "temp" folder inside "blah" blob container.
    /// </summary>
    private static void GetFilesInSubfolder()
    {
        var account = new CloudStorageAccount(new StorageCredentials(accountName, accountKey), true);
        var blobClient = account.CreateCloudBlobClient();
        var container = blobClient.GetContainerReference("blah");
        var directory = container.GetDirectoryReference("temp");
        var result = directory.ListBlobsSegmented(true, BlobListingDetails.None, 500, null, null, null);
        var blobs = result.Results;
    }

Answer 2

该ListBlobsSegmentedAsync方法具有2个重载包含useFlatBlobListing参数。这些重载接受7或8个参数，我在您的代码中计为6。由于参数太多，因此可以使用命名参数使代码更易于理解。

下面的代码已在.NET Core中成功测试。

BlobContinuationToken blobContinuationToken = null;
do
{
    var resultSegment = await cloudBlobContainer.ListBlobsSegmentedAsync(
        prefix            : null,
        useFlatBlobListing: true, 
        blobListingDetails: BlobListingDetails.None,
        maxResults        : null,
        currentToken      : blobContinuationToken,
        options           : null,
        operationContext  : null
    );

    // Get the value of the continuation token returned by the listing call.
    blobContinuationToken = resultSegment.ContinuationToken;
    foreach (IListBlobItem item in resultSegment.Results)
    {
        Console.WriteLine(item.Uri);
    }
} while (blobContinuationToken != null); // Loop while the continuation token is not null.

此代码从Microsoft的storage-blobs-dotnet-quickstart存储库派生。