IDocumentClient.ReadAttachmentFeedAsync Method

Definition

Namespace:

Microsoft.Azure.Documents

Assemblies:

Microsoft.Azure.DocumentDB.Core.dll, Microsoft.Azure.Documents.Client.dll

Packages:

Microsoft.Azure.DocumentDB v2.18.0, Microsoft.Azure.DocumentDB.Core v2.18.0

Overloads

ReadAttachmentFeedAsync(String, FeedOptions, CancellationToken)	Reads the feed (sequence) of Attachment for a document from the Azure Cosmos DB service as an asynchronous operation.
ReadAttachmentFeedAsync(Uri, FeedOptions, CancellationToken)	Reads the feed (sequence) of attachments for a document as an asynchronous operation in the Azure Cosmos DB service.

ReadAttachmentFeedAsync(String, FeedOptions, CancellationToken)

Reads the feed (sequence) of Attachment for a document from the Azure Cosmos DB service as an asynchronous operation.

public System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.FeedResponse<Microsoft.Azure.Documents.Attachment>> ReadAttachmentFeedAsync (string attachmentsLink, Microsoft.Azure.Documents.Client.FeedOptions options = default, System.Threading.CancellationToken cancellationToken = default);

abstract member ReadAttachmentFeedAsync : string * Microsoft.Azure.Documents.Client.FeedOptions * System.Threading.CancellationToken -> System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.FeedResponse<Microsoft.Azure.Documents.Attachment>>

Public Function ReadAttachmentFeedAsync (attachmentsLink As String, Optional options As FeedOptions = Nothing, Optional cancellationToken As CancellationToken = Nothing) As Task(Of FeedResponse(Of Attachment))

Parameters

attachmentsLink

String

The SelfLink of the resources to be read. E.g. /dbs/db_rid/colls/coll_rid/docs/doc_rid/attachments/

options

FeedOptions

(Optional) The request options for the request.

cancellationToken

CancellationToken

(Optional) A CancellationToken that can be used by other objects or threads to receive notice of cancellation.

Returns

Task<FeedResponse<Attachment>>

A System.Threading.Tasks containing a ResourceResponse<TResource> which wraps a Attachment containing the read resource record.

Exceptions

ArgumentNullException

If attachmentsLink is not set.

DocumentClientException

This exception can encapsulate many different types of errors. To determine the specific error always look at the StatusCode property. Some common codes you may get when creating a Document are:

StatusCode	Reason for exception
404	NotFound - This means the resource feed you tried to read did not exist. Check the parent rids are correct.
429	TooManyRequests - This means you have exceeded the number of request units per second. Consult the DocumentClientException.RetryAfter value to see how long you should wait before retrying this operation.

Examples

int count = 0;
string continuation = string.Empty;
do
{
    // Read Attachment feed 10 items at a time until there are no more to read
    FeedResponse<Attachment> response = await client.ReadAttachmentFeedAsync("/dbs/db_rid/colls/coll_rid/docs/doc_rid/attachments/ ",
                                                    new FeedOptions
                                                    {
                                                        MaxItemCount = 10,
                                                        RequestContinuation = continuation
                                                    });

    // Append the item count
    count += response.Count;

    // Get the continuation so that we know when to stop.
     continuation = response.ResponseContinuation;
} while (!string.IsNullOrEmpty(continuation));

See also

• Attachment
• RequestOptions
• ResourceResponse<TResource>
• Task

ReadAttachmentFeedAsync(Uri, FeedOptions, CancellationToken)

Reads the feed (sequence) of attachments for a document as an asynchronous operation in the Azure Cosmos DB service.

public System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.FeedResponse<Microsoft.Azure.Documents.Attachment>> ReadAttachmentFeedAsync (Uri documentUri, Microsoft.Azure.Documents.Client.FeedOptions options = default, System.Threading.CancellationToken cancellationToken = default);

abstract member ReadAttachmentFeedAsync : Uri * Microsoft.Azure.Documents.Client.FeedOptions * System.Threading.CancellationToken -> System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.FeedResponse<Microsoft.Azure.Documents.Attachment>>

Public Function ReadAttachmentFeedAsync (documentUri As Uri, Optional options As FeedOptions = Nothing, Optional cancellationToken As CancellationToken = Nothing) As Task(Of FeedResponse(Of Attachment))

Parameters

documentUri

Uri

The URI of the parent document.

options

FeedOptions

(Optional) The FeedOptions for the request.

cancellationToken

CancellationToken

(Optional) A CancellationToken that can be used by other objects or threads to receive notice of cancellation.

Returns

Task<FeedResponse<Attachment>>

The task object representing the service response for the asynchronous operation.