C# CloudBlobContainer.SetMetadataAsync方法代码示例

 /// <summary>
 /// Test container reads and writes, expecting success.
 /// </summary>
 /// <param name="testContainer">The container.</param>
 /// <param name="testAccessCondition">The access condition to use.</param>
 private async Task ContainerReadWriteExpectLeaseSuccessAsync(CloudBlobContainer testContainer, AccessCondition testAccessCondition)
 {
     await testContainer.FetchAttributesAsync(testAccessCondition, null /* options */, null);
     await testContainer.GetPermissionsAsync(testAccessCondition, null /* options */, null);
     await testContainer.SetMetadataAsync(testAccessCondition, null /* options */, null);
     await testContainer.SetPermissionsAsync(new BlobContainerPermissions(), testAccessCondition, null /* options */, null);
 }

        /// <summary>
        /// Add some sample metadata to the container.
        /// </summary>
        /// <param name="container">A CloudBlobContainer object.</param>
        /// <returns>A Task object.</returns>
        private static async Task AddContainerMetadataAsync(CloudBlobContainer container)
        {
            try
            {
                // Add some metadata to the container.
                container.Metadata.Add("docType", "textDocuments");
                container.Metadata["category"] = "guidance";

                // Set the container's metadata asynchronously.
                await container.SetMetadataAsync();
            }
            catch (StorageException e)
            {
                Console.WriteLine(e.Message);
                Console.ReadLine();
                throw;
            }
        }

        /// <summary>
        /// Test container reads and writes, expecting lease failure.
        /// </summary>
        /// <param name="testContainer">The container.</param>
        /// <param name="testAccessCondition">The failing access condition to use.</param>
        /// <param name="expectedErrorCode">The expected error code.</param>
        /// <param name="description">The reason why these calls should fail.</param>
        private async Task ContainerReadWriteExpectLeaseFailureAsync(CloudBlobContainer testContainer, AccessCondition testAccessCondition, HttpStatusCode expectedStatusCode, string expectedErrorCode, string description)
        {
            OperationContext operationContext = new OperationContext();

            // FetchAttributes is a HEAD request with no extended error info, so it returns with the generic ConditionFailed error code.
            await TestHelper.ExpectedExceptionAsync(
                async () => await testContainer.FetchAttributesAsync(testAccessCondition, null /* options */, operationContext),
                operationContext,
                description + "(Fetch Attributes)",
                HttpStatusCode.PreconditionFailed);

            await TestHelper.ExpectedExceptionAsync(
                async () => await testContainer.GetPermissionsAsync(testAccessCondition, null /* options */, operationContext),
                operationContext,
                description + " (Get Permissions)",
                expectedStatusCode,
                expectedErrorCode);
            await TestHelper.ExpectedExceptionAsync(
                async () => await testContainer.SetMetadataAsync(testAccessCondition, null /* options */, operationContext),
                operationContext,
                description + " (Set Metadata)",
                expectedStatusCode,
                expectedErrorCode);
            await TestHelper.ExpectedExceptionAsync(
                async () => await testContainer.SetPermissionsAsync(new BlobContainerPermissions(), testAccessCondition, null /* options */, operationContext),
                operationContext,
                description + " (Set Permissions)",
                expectedStatusCode,
                expectedErrorCode);
        }

        /// <summary>
        /// Verifies the behavior of a lease while the lease holds. Once the lease expires, this method confirms that write operations succeed.
        /// The test is cut short once the <c>testLength</c> time has elapsed.
        /// </summary>
        /// <param name="leasedContainer">The container.</param>
        /// <param name="duration">The duration of the lease.</param>
        /// <param name="testLength">The maximum length of time to run the test.</param>
        /// <param name="tolerance">The allowed lease time error.</param>
        internal async Task ContainerAcquireRenewLeaseTestAsync(CloudBlobContainer leasedContainer, TimeSpan? duration, TimeSpan testLength, TimeSpan tolerance)
        {
            OperationContext operationContext = new OperationContext();
            DateTime beginTime = DateTime.UtcNow;

            while (true)
            {
                try
                {
                    // Attempt to delete the container with no lease ID.
                    await leasedContainer.DeleteAsync(null, null, operationContext);

                    // The delete succeeded, which means that the lease must have expired.

                    // If the lease was infinite then there is an error because it should not have expired.
                    Assert.IsNotNull(duration, "An infinite lease should not expire.");

                    // The lease should be past its expiration time.
                    Assert.IsTrue(DateTime.UtcNow - beginTime > duration - tolerance, "Deletes should not succeed while lease is present.");

                    // Since the lease has expired (and the container was deleted), the test is over.
                    return;
                }
                catch (Exception)
                {
                    if (operationContext.LastResult.ExtendedErrorInformation.ErrorCode == BlobErrorCodeStrings.LeaseIdMissing)
                    {
                        // We got this error because the lease has not expired yet.

                        // Make sure the lease is not past its expiration time yet.
                        DateTime currentTime = DateTime.UtcNow;
                        if (duration.HasValue)
                        {
                            Assert.IsTrue(currentTime - beginTime < duration + tolerance, "Deletes should succeed after a lease expires.");
                        }

                        // End the test early if necessary
                        if (currentTime - beginTime > testLength)
                        {
                            // The lease has not expired, but we're not waiting any longer.
                            return;
                        }
                    }
                    else
                    {
                        throw;
                    }
                }

                // Attempt to write to and read from the container. This should always succeed.
                await leasedContainer.SetMetadataAsync();
                await leasedContainer.FetchAttributesAsync();

                // Wait 1 second before trying again.
                await Task.Delay(TimeSpan.FromSeconds(1));
            }
        }

 /// <summary>
 /// Test container reads and writes, expecting success.
 /// </summary>
 /// <param name="testContainer">The container.</param>
 /// <param name="testAccessCondition">The access condition to use.</param>
 private void ContainerReadWriteExpectLeaseSuccessTask(CloudBlobContainer testContainer, AccessCondition testAccessCondition)
 {
     testContainer.FetchAttributesAsync(testAccessCondition, null /* options */, null /* operationContext */).Wait();
     testContainer.GetPermissionsAsync(testAccessCondition, null /* options */, null /* operationContext */).Wait();
     testContainer.SetMetadataAsync(testAccessCondition, null /* options */, null /* operationContext */).Wait();
     testContainer.SetPermissionsAsync(new BlobContainerPermissions(), testAccessCondition, null /* options */, null /* operationContext */).Wait();
 }

 private async Task<HttpResponseMessage> SetContainerMetadata(CloudBlobContainer container)
 {
     const string MetadataPrefix = "x-ms-meta-";
     HttpRequestBase request = RequestFromContext(HttpContextFactory.Current);
     container.Metadata.Clear();
     var metadata = Request.Headers.Where(header => header.Key.StartsWith(MetadataPrefix));
     foreach (var metadatum in metadata)
     {
         container.Metadata.Add(metadatum.Key.Substring(MetadataPrefix.Length), metadatum.Value.FirstOrDefault());
     }
     await container.SetMetadataAsync();
     HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
     await AddBasicContainerHeaders(response, container);
     return response;
 }

 static async Task CopyContainer(CloudBlobContainer sourceContainer, CloudBlobContainer destContainer)
 {
     await sourceContainer.FetchAttributesAsync();
     var access = await sourceContainer.GetPermissionsAsync();
     await destContainer.CreateIfNotExistsAsync(access.PublicAccess, null, null);
     await destContainer.SetPermissionsAsync(access);
     destContainer.Metadata.Clear();
     foreach (var metadatum in sourceContainer.Metadata)
     {
         destContainer.Metadata.Add(metadatum);
     }
     await destContainer.SetMetadataAsync();
 }