C# CloudBlobContainer.FetchAttributes方法代码示例

        ///<summary>Updates the blobs in a storage container.</summary>
        ///<param name="container">The container to update.</param>
        ///<param name="newVersion">The new version being uploaded.</param>
        ///<param name="sourcePath">The directory on the local disk containing the new files.</param>
        public static void UpdateStorage(CloudBlobContainer container, Version newVersion, string sourcePath)
        {
            container.FetchAttributes();

            var remoteFiles = container.ListBlobs(Options).Cast<CloudBlob>().ToArray();
            var oldBlobs = remoteFiles.ToDictionary(
                blob => Path.Combine(sourcePath,
                    container.Uri.MakeRelativeUri(blob.Uri).ToString().Replace('/', '\\')
                )
            );

            var baseUri = new Uri(sourcePath, UriKind.Absolute);
            foreach (var file in new DirectoryInfo(sourcePath).EnumerateFiles("*", SearchOption.AllDirectories)) {
                CloudBlob blob;
                byte[] hash = file.SHA512Hash();

                //If there already is a blob for this file, use it.
                if (!oldBlobs.TryGetValue(file.FullName, out blob)) {
                    blob = container.GetBlobReference(baseUri.MakeRelativeUri(new Uri(file.FullName, UriKind.Absolute)).ToString());
                } else {
                    oldBlobs.Remove(file.FullName);	//Remove the blob from the dictionary; all blobs left in the dictionary will be deleted.

                    if (file.Length == blob.Properties.Length
                     && Convert.FromBase64String(blob.Metadata["SHA512"]).SequenceEqual(hash))
                        continue;	//If the blob is identical, don't re-upload it.
                }
                blob.Metadata["SHA512"] = Convert.ToBase64String(hash);
                blob.UploadFile(file.FullName);
            }

            foreach (var blob in oldBlobs.Values)
                blob.Delete();

            container.Metadata["Version"] = newVersion.ToString();
            container.SetMetadata();
        }

 /// <summary>
 /// Checks if a container exists.
 /// </summary>
 /// <param name="container">Container to check for</param>
 /// <returns>Flag indicating the existence of the container</returns>
 private static bool Exists(CloudBlobContainer container)
 {
     try
     {
         container.FetchAttributes();
         return true;
     }
     catch (StorageClientException e)
     {
         if (e.ErrorCode == StorageErrorCode.ResourceNotFound)
         {
             return false;
         }
         else
         {
             throw;
         }
     }
 }

        private bool ContainerExists(CloudBlobContainer container)
        {
            try
            {
                container.FetchAttributes();
            }
            catch (StorageClientException)
            {
                return false;
            }

            return true;
        }