如何使用ListBlobsSegmentedAsync从Azure BLOB中的目录获取所有文件

Question

在尝试访问Azure blob文件夹的所有文件时，获取container.ListBlobs();的示例代码，但是看起来像是一个旧的代码。

旧代码：container.ListBlobs();

尝试新代码：container.ListBlobsSegmentedAsync(continuationToken);

我正在尝试使用以下代码：

container.ListBlobsSegmentedAsync(continuationToken);

文件夹就像：

Container/F1/file.json
Container/F1/F2/file.json
Container/F2/file.json

正在寻找更新版本以从Azure文件夹中获取所有文件。 任何示例代码都会有所帮助，谢谢！

Answer 1

C＃代码：

   //connection string
    string storageAccount_connectionString = "**NOTE: CONNECTION STRING**";

    // Retrieve storage account from connection string.
    CloudStorageAccount storageAccount = CloudStorageAccount.Parse(storageAccount_connectionString);

    // Create the blob client.
    CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

    // Retrieve reference to a previously created container.
    CloudBlobContainer container = blobClient.GetContainerReference("**NOTE:NAME OF CONTAINER**");
    //The specified container does not exist

    try
    {
        //root directory
        CloudBlobDirectory dira = container.GetDirectoryReference(string.Empty);
        //true for all sub directories else false 
        var rootDirFolders = dira.ListBlobsSegmentedAsync(true, BlobListingDetails.Metadata, null, null, null, null).Result;

        foreach (var blob in rootDirFolders.Results)
        {
             Console.WriteLine("Blob", blob);
        }

    }
    catch (Exception e)
    {
        //  Block of code to handle errors
        Console.WriteLine("Error", e);

    }

Answer 2

这是答案的代码：

private async Task<List<IListBlobItem>> ListBlobsAsync(CloudBlobContainer container)
{
    BlobContinuationToken continuationToken = null;
    List<IListBlobItem> results = new List<IListBlobItem>();
    do
    {
       bool useFlatBlobListing = true;
       BlobListingDetails blobListingDetails = BlobListingDetails.None;
       int maxBlobsPerRequest = 500;
       var response = await container.ListBlobsSegmentedAsync(BOAppSettings.ConfigServiceEnvironment, useFlatBlobListing, blobListingDetails, maxBlobsPerRequest, continuationToken, null, null);
            continuationToken = response.ContinuationToken;
            results.AddRange(response.Results);
        }
     while (continuationToken != null);
     return results;
}

然后您可以返回如下值：

IEnumerable<IListBlobItem> listBlobs = await this.ListBlobsAsync(container);
foreach(CloudBlockBlob cloudBlockBlob in listBlobs)
  {
     BOBlobFilesViewModel boBlobFilesViewModel = new BOBlobFilesViewModel
     {
          CacheKey = cloudBlockBlob.Name,
          Name = cloudBlockBlob.Name
      };
      listBOBlobFilesViewModel.Add(boBlobFilesViewModel);
   }
//return listBOBlobFilesViewModel;

Answer 3

方法CloudBlobClient.ListBlobsSegmentedAsync用于返回包含容器中blob项目集合的结果段。

要列出所有斑点，我们可以使用ListBlobs方法

以下是演示供您参考：

    public static List<V> ListAllBlobs<T, V>(Expression<Func<T, V>> expression, string containerName,string prefix)
    {
        CloudStorageAccount storageAccount = CloudStorageAccount.Parse("YourConnectionString;");

        CloudBlobClient cloudBlobClient = storageAccount.CreateCloudBlobClient();

        CloudBlobContainer container = cloudBlobClient.GetContainerReference(containerName);
        container.CreateIfNotExists();

        var list = container.ListBlobs(prefix: prefix,useFlatBlobListing: true);

        List<V> data = list.OfType<T>().Select(expression.Compile()).ToList();
        return data;
    }

用法和屏幕截图：

在一个文件夹下列出所有blob的名称：

在一个文件夹下列出所有Blob的URL：

Answer 4

更新： 使用 Azure.Storage.Blobs v12 - Package

从目录中获取所有文件名

var storageConnectionString = "DefaultEndpointsProtocol=...........=core.windows.net";
var blobServiceClient = new BlobServiceClient(storageConnectionString);

//get container
var container = _blobServiceClient.GetBlobContainerClient("container_name");
        
List<string> blobNames = new List<string>();

//Enumerating the blobs may make multiple requests to the service while fetching all the values
//Blobs are ordered lexicographically by name
//if you want metadata set BlobTraits - BlobTraits.Metadata
var blobs = container.GetBlobsByHierarchyAsync(BlobTraits.None, BlobStates.None, "/");

await foreach (var blob in blobs)
{
   //check if the blob is a virtual directory.
   if (blob.IsPrefix)
   {        
      // You can also access files under nested folders in this way,
      //of course you will need to create a function accordingly (you can do a recursive function)
      //var prefix = blob.Name;  // blob.Name = "folderA\"
      //var blobs = container.GetBlobsByHierarchyAsync(BlobTraits.None, BlobStates.None, "/", prefix);      
    }
    else
    {
        blobNames.Add(blob.Name);
    }    
}

您可以找到更多选项和示例here。

这是 nuget 包的 link。