Question

下面是我为容器中的所有blob创建快照的方法：

public static EmsStorageSnapshot CreateSnapshot(EmsStorageAccount storageAccount, EmsStorageContainer nContainer)
{
  try
  {
    DateTime snapDate = DateTime.Now;

    EmsStorageSnapshot snapshot = new EmsStorageSnapshot() { CreatedAt = snapDate, SnapshotReference = snapDate.ToString() };
    // var metadata = new Dictionary<string, string> { { "snapshotIssued", snapDate.ToString() } };

    CloudStorageAccount account = new CloudStorageAccount(new StorageCredentials(storageAccount.StorageAccountName, storageAccount.StorageAccountKey), false);

    var client = account.CreateCloudBlobClient();
    var container = client.GetContainerReference(nContainer.ContainerName);

    List<CloudBlockBlob> blobs = container.ListBlobs().OfType<CloudBlockBlob>().ToList();

    foreach (var blob in blobs)
    {
      try
      {
        if (!blob.IsSnapshot)
        {
          var snapBlob = blob.CreateSnapshot();
          snapBlob.Metadata.Add("snapshotIssued", snapDate.ToString());
          snapBlob.SetMetadata();
        }
      }
      catch (StorageException ex)
      {
        Console.WriteLine("Failed to create a snapshot of blob {0}.", blob.Name);
        Logger.Log("Failed to create a snapshot of blob '" + blob.Name + "': " + ex.ToString(), VerboseLevel.Error);
      }
    }
    return snapshot;
  }
  catch (Exception ex)
  {
    Logger.Log(ex.ToString(), VerboseLevel.Error);
  }
  return null;
}

在该行（var snapBlob = blob.CreateSnapshot（）;）我收到以下错误：

  Microsoft.WindowsAzure.Storage.StorageException: The argument is out of range. Value passed: 
  Parameter name: snapshot ---> System.ArgumentOutOfRangeException: The argument is out of range. Value passed: 
  Parameter name: snapshot
     at Microsoft.WindowsAzure.Storage.Core.Util.CommonUtility.ArgumentOutOfRange(String paramName, Object value) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\Common\Core\Util\CommonUtility.cs:line 168
     at Microsoft.WindowsAzure.Storage.Core.Util.NavigationHelper.ParseSnapshotTime(String snapshot) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\Common\Core\Util\NavigationHelper.cs:line 665
     at Microsoft.WindowsAzure.Storage.Blob.CloudBlockBlob.<>c__DisplayClass69.<CreateSnapshotImpl>b__68(RESTCommand`1 cmd, HttpWebResponse resp, Exception ex, OperationContext ctx) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Blob\CloudBlockBlob.cs:line 3006
     at Microsoft.WindowsAzure.Storage.Core.Executor.Executor.ExecuteSync[T](RESTCommand`1 cmd, IRetryPolicy policy, OperationContext operationContext) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Core\Executor\Executor.cs:line 711

我做错了什么或这是一个错误？

Microsoft.WindowsAzure.Storage.dll版本= 8.7.0.0

Answer 1

我读了源代码，发现在解析快照时间时抛出了异常。你可以参考这个article。

internal static DateTimeOffset ParseSnapshotTime(string snapshot)
        {
            DateTimeOffset snapshotTime;
            if (!DateTimeOffset.TryParse(snapshot, CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out snapshotTime))
            {
                CommonUtility.ArgumentOutOfRange("snapshot", snapshot);
            }
            return snapshotTime;
        }

我在当地测试，效果很好。因此，我建议您尝试在本地计算机上测试代码，并使用fiddler检查x-ms快照。

另外，据我所知，您无法在创建快照后设置元数据。因此，您可以参考以下代码首先设置元数据并创建快照。

Dictionary<string, string> metadata = new Dictionary<string, string>();
metadata.Add("snapshotIssued", snapDate.ToString());
blob.CreateSnapshot(metadata);

Azure：StorageException：参数超出范围。 CloudBlockBlob.CreateSnapshot（）

1 个答案: