Question

我有将blob插入存储的代码，并允许用户查看blob列表和单个blob。但是，我现在无法删除blob，出现的错误是

＆＃34;类型＆＃39; System.ServiceModel.FaultException`1＆＃39;的例外情况发生在System.ServiceModel.ni.dll中但未在用户代码中处理。附加信息：远程服务器返回错误：（404）Not Found。＆＃34;

WCF服务中的代码是

public void DeleteBlob(string guid, string uri)
{
    //create the storage account with shared access key
    CloudStorageAccount storageAccount = CloudStorageAccount.Parse(accountDetails);

    CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
    CloudBlobContainer container = blobClient.GetContainerReference(guid);

    CloudBlockBlob blob = container.GetBlockBlobReference(uri);
    blob.DeleteIfExists();
}

然后我通过SOAP服务在移动客户端应用程序中访问它：

private void mnuDelete_Click(object sender, EventArgs e)
{
    MessageBoxResult message = MessageBox.Show("Are you sure you want to delete this image?", "Delete", MessageBoxButton.OKCancel);
    if (message == MessageBoxResult.OK)
    {
        Service1Client svc = new Service1Client();
        svc.DeleteBlobCompleted += new EventHandler<AsyncCompletedEventArgs>(svc_DeleteBlobCompleted);
        svc.DeleteBlobAsync(container, uri);
    }
}
void svc_DeleteBlobCompleted(object sender, AsyncCompletedEventArgs e)
{
    if (e.Error == null) {
        NavigationService.Navigate(new Uri("/Pages/albums.xaml", UriKind.Relative));
    }
    else {
        MessageBox.Show("Unable to delete this photo at this time", "Error", MessageBoxButton.OK);
    }
}

我也首先使用SAS令牌来保存blob - 我不知道这是否有所作为？

Answer 1

在Azure Storage Client Library 4.0中，我们更改了Get * Reference方法以仅接受相对地址。因此，如果您使用的是最新的库和参数＆＃34; uri＆＃34;是绝对地址，您应该将其更改为blob名称，或者应使用带有Uri和CloudBlockBlob constructor对象的StorageCredentials。

请在GitHub repository。

中查看所有此类重大更改

Answer 2

我在ASP.NET核心MVC网络应用程序（v1.1.3）中使用 WindowsAzure.Storage（v8.1.4）。

我的网络应用程序上有图像裁剪和调整大小功能，所以我决定使用Azure Blob存储来存储原始（用户上传的）图片和裁剪（调整大小后）图片。

即使您将CloudBlockBlob构造函数与绝对uri一起使用，也要记住一件重要的事情，即您仍然需要将存储帐户凭据传递到CloudBlockBlob构造

public class AzureBlobStorageService : IBlobStorageService
{
    private readonly AzureBlobConnectionConfigurations _azureBlobConnectionOptions;
    private readonly CloudStorageAccount _storageAccount;
    private readonly CloudBlobClient _blobClient;

    public AzureBlobStorageService(IOptions<AzureBlobConnectionConfigurations> azureBlobConnectionAccessor)
    {
        _azureBlobConnectionOptions = azureBlobConnectionAccessor.Value;

        _storageAccount = CloudStorageAccount.Parse(_azureBlobConnectionOptions.StorageConnectionString);
        _blobClient = _storageAccount.CreateCloudBlobClient();
    }

    public async Task<Uri> UploadAsync(string containerName, string blobName, IFormFile image)
    {
        ...
    }

    public async Task<Uri> UploadAsync(string containerName, string blobName, byte[] imageBytes)
    {
        ...
    }

    public async Task<byte[]> GetBlobByUrlAsync(string url, bool deleteAfterFetch = false)
    {
        // This works
        var blockBlob = new CloudBlockBlob(new Uri(url), _storageAccount.Credentials);

        // Even this will fail
        //var blockBlob = new CloudBlockBlob(new Uri(url));

        await blockBlob.FetchAttributesAsync();

        byte[] arr = new byte[blockBlob.Properties.Length];
        await blockBlob.DownloadToByteArrayAsync(arr, 0);

        if (deleteAfterFetch)
        {
            await blockBlob.DeleteIfExistsAsync();
        }

        return arr;
    }

    private async Task<CloudBlobContainer> CreateContainerIfNotExistAsync(string containerName)
    {
        var container = _blobClient.GetContainerReference(containerName);
        if (!await container.ExistsAsync())
        {
            await container.CreateAsync();
            await container.SetPermissionsAsync(new BlobContainerPermissions
            {
                PublicAccess = BlobContainerPublicAccessType.Blob
            });
        }

        return container;
    }
}

希望这有帮助。

Answer 3

在Azure存储客户端库4.0中，必须将get Reference方法更改为接受相对地址，而别无其他。因此，这不支持早于此的库，

您应该将其更改为blob名称，或者应该使用带有Uri和StorageCredentials对象的CloudBlockBlob构造函数。

在c＃中从Windows azure中删除blob

3 个答案: