DocumentClient.ReadDocumentCollectionAsync Method
Definition
Important
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Overloads
| ReadDocumentCollectionAsync(String, RequestOptions) |
Reads a DocumentCollection from the Azure Cosmos DB service as an asynchronous operation. |
| ReadDocumentCollectionAsync(Uri, RequestOptions) |
Reads a DocumentCollection as an asynchronous operation from the Azure Cosmos DB service. |
ReadDocumentCollectionAsync(String, RequestOptions)
Reads a DocumentCollection from the Azure Cosmos DB service as an asynchronous operation.
public System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.ResourceResponse<Microsoft.Azure.Documents.DocumentCollection>> ReadDocumentCollectionAsync (string documentCollectionLink, Microsoft.Azure.Documents.Client.RequestOptions options = default);abstract member ReadDocumentCollectionAsync : string * Microsoft.Azure.Documents.Client.RequestOptions -> System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.ResourceResponse<Microsoft.Azure.Documents.DocumentCollection>>
override this.ReadDocumentCollectionAsync : string * Microsoft.Azure.Documents.Client.RequestOptions -> System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.ResourceResponse<Microsoft.Azure.Documents.DocumentCollection>>Public Function ReadDocumentCollectionAsync (documentCollectionLink As String, Optional options As RequestOptions = Nothing) As Task(Of ResourceResponse(Of DocumentCollection))Parameters
- documentCollectionLink
- String
The link for the DocumentCollection to be read.
- options
- RequestOptions
(Optional) The request options for the request.
Returns
A System.Threading.Tasks containing a ResourceResponse<TResource> which wraps a DocumentCollection containing the read resource record.
Implements
Exceptions
If documentCollectionLink is not set.
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 you tried to read did not exist. |
| 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
//This reads a DocumentCollection record from a database where
// - sample_database is the ID of the database
// - collection_id is the ID of the collection resource to be read
var collLink = "/dbs/sample_database/colls/collection_id";
DocumentCollection coll = await client.ReadDocumentCollectionAsync(collLink);
Remarks
Doing a read of a resource is the most efficient way to get a resource from the Database. If you know the resource's ID, do a read instead of a query by ID.
The example shown uses ID-based links, where the link is composed of the ID properties used when the resources were created. You can still use the SelfLink property of the DocumentCollection if you prefer. A self-link is a URI for a resource that is made up of Resource Identifiers (or the _rid properties). ID-based links and SelfLink will both work. The format for documentCollectionLink is always "/dbs/{db identifier}/colls/{coll identifier}" only the values within the {} change depending on which method you wish to use to address the resource.
See also
Applies to
ReadDocumentCollectionAsync(Uri, RequestOptions)
Reads a DocumentCollection as an asynchronous operation from the Azure Cosmos DB service.
public System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.ResourceResponse<Microsoft.Azure.Documents.DocumentCollection>> ReadDocumentCollectionAsync (Uri documentCollectionUri, Microsoft.Azure.Documents.Client.RequestOptions options = default);abstract member ReadDocumentCollectionAsync : Uri * Microsoft.Azure.Documents.Client.RequestOptions -> System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.ResourceResponse<Microsoft.Azure.Documents.DocumentCollection>>
override this.ReadDocumentCollectionAsync : Uri * Microsoft.Azure.Documents.Client.RequestOptions -> System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.ResourceResponse<Microsoft.Azure.Documents.DocumentCollection>>Public Function ReadDocumentCollectionAsync (documentCollectionUri As Uri, Optional options As RequestOptions = Nothing) As Task(Of ResourceResponse(Of DocumentCollection))Parameters
- documentCollectionUri
- Uri
A URI to the DocumentCollection resource to be read.
- options
- RequestOptions
The request options for the request.
Returns
A System.Threading.Tasks containing a ResourceResponse<TResource> which wraps a DocumentCollection containing the read resource record.
Implements
Exceptions
If documentCollectionUri is not set.
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 you tried to read did not exist. |
| 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
//Reads a Document resource where
// - db_id is the ID property of the Database
// - coll_id is the ID property of the DocumentCollection you wish to read.
var collLink = UriFactory.CreateCollectionUri("db_id", "coll_id");
DocumentCollection coll = await client.ReadDocumentCollectionAsync(collLink);
Remarks
Doing a read of a resource is the most efficient way to get a resource from the service. If you know the resource's ID, do a read instead of a query by ID.
See also
Applies to
Azure SDK for .NET