共用方式為


ServiceBusReceiveActions.PeekMessagesAsync Method

Definition

Fetches a list of active messages without changing the state of the receiver or the message source.

public virtual System.Threading.Tasks.Task<System.Collections.Generic.IReadOnlyList<Azure.Messaging.ServiceBus.ServiceBusReceivedMessage>> PeekMessagesAsync (int maxMessages, long? fromSequenceNumber = default, System.Threading.CancellationToken cancellationToken = default);
abstract member PeekMessagesAsync : int * Nullable<int64> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<System.Collections.Generic.IReadOnlyList<Azure.Messaging.ServiceBus.ServiceBusReceivedMessage>>
override this.PeekMessagesAsync : int * Nullable<int64> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<System.Collections.Generic.IReadOnlyList<Azure.Messaging.ServiceBus.ServiceBusReceivedMessage>>
Public Overridable Function PeekMessagesAsync (maxMessages As Integer, Optional fromSequenceNumber As Nullable(Of Long) = Nothing, Optional cancellationToken As CancellationToken = Nothing) As Task(Of IReadOnlyList(Of ServiceBusReceivedMessage))

Parameters

maxMessages
Int32

The maximum number of messages that will be fetched.

fromSequenceNumber
Nullable<Int64>

An optional sequence number from where to peek the message. This corresponds to the SequenceNumber.

cancellationToken
CancellationToken

An optional CancellationToken instance to signal the request to cancel the operation.

Returns

An IReadOnlyList<T> of messages that were peeked.

Remarks

Unlike a received message, a peeked message will not have a lock token associated with it, and hence it cannot be Completed/Abandoned/Deferred/Deadlettered/Renewed. Also, unlike ReceiveMessageAsync(Nullable<TimeSpan>, CancellationToken), this method will fetch even Deferred messages (but not Deadlettered messages).

Applies to