MessageReceiver Class

Definition

The MessageReceiver can be used to receive messages from Queues and Subscriptions and acknowledge them.

public class MessageReceiver : Microsoft.Azure.ServiceBus.ClientEntity, Microsoft.Azure.ServiceBus.Core.IMessageReceiver
type MessageReceiver = class
    inherit ClientEntity
    interface IMessageReceiver
    interface IReceiverClient
    interface IClientEntity
Public Class MessageReceiver
Inherits ClientEntity
Implements IMessageReceiver
Inheritance
MessageReceiver
Implements

Examples

Create a new MessageReceiver to receive a message from a Subscription

IMessageReceiver messageReceiver = new MessageReceiver(
    namespaceConnectionString,
    EntityNameHelper.FormatSubscriptionPath(topicName, subscriptionName),
    ReceiveMode.PeekLock);

Receive a message from the Subscription.

var message = await messageReceiver.ReceiveAsync();
await messageReceiver.CompleteAsync(message.SystemProperties.LockToken);

Remarks

The MessageReceiver provides advanced functionality that is not found in the QueueClient or SubscriptionClient. For instance, ReceiveAsync(), which allows you to receive messages on demand, but also requires you to manually renew locks using RenewLockAsync(Message). It uses AMQP protocol to communicate with service.

Constructors

MessageReceiver(ServiceBusConnectionStringBuilder, ReceiveMode, RetryPolicy, Int32)

Creates a new MessageReceiver from a ServiceBusConnectionStringBuilder.

MessageReceiver(String, String, ReceiveMode, RetryPolicy, Int32)

Creates a new MessageReceiver from a specified connection string and entity path.

Properties

ClientId

Gets the ID to identify this client. This can be used to correlate logs and exceptions.

(Inherited from ClientEntity)
IsClosedOrClosing

Returns true if the client is closed or closing.

(Inherited from ClientEntity)
LastPeekedSequenceNumber

Gets the sequence number of the last peeked message.

OperationTimeout

Duration after which individual operations will timeout.

Path

The path of the entity for this receiver. For Queues this will be the name, but for Subscriptions this will be the path.

PrefetchCount

Prefetch speeds up the message flow by aiming to have a message readily available for local retrieval when and before the application asks for one using Receive. Setting a non-zero value prefetches PrefetchCount number of messages. Setting the value to zero turns prefetch off. Defaults to 0.

ReceiveMode

Gets the ReceiveMode of the current receiver.

RegisteredPlugins

Gets a list of currently registered plugins.

RetryPolicy

Gets the RetryPolicy defined on the client.

(Inherited from ClientEntity)

Methods

AbandonAsync(String, IDictionary<String,Object>)

Abandons a Message using a lock token. This will make the message available again for processing.

CloseAsync()

Closes the Client. Closes the connections opened by it.

(Inherited from ClientEntity)
CompleteAsync(IEnumerable<String>)

Completes a series of Message using a list of lock tokens. This will delete the message from the service.

CompleteAsync(String)

Completes a Message using its lock token. This will delete the message from the service.

DeadLetterAsync(String, IDictionary<String,Object>)

Moves a message to the deadletter sub-queue.

DeadLetterAsync(String, String, String)

Moves a message to the deadletter sub-queue.

DeferAsync(String, IDictionary<String,Object>)

Indicates that the receiver wants to defer the processing for the message.

OnAbandonAsync(String, IDictionary<String,Object>)
OnClosingAsync()
OnCompleteAsync(IEnumerable<String>)
OnDeadLetterAsync(String, IDictionary<String,Object>, String, String)
OnDeferAsync(String, IDictionary<String,Object>)
OnMessageHandler(MessageHandlerOptions, Func<Message,CancellationToken,Task>)
OnPeekAsync(Int64, Int32)
OnReceiveAsync(Int32, TimeSpan)
OnReceiveDeferredMessageAsync(Int64[])
OnRenewLockAsync(String)
PeekAsync()

Fetches the next active message without changing the state of the receiver or the message source.

PeekAsync(Int32)

Fetches the next batch of active messages without changing the state of the receiver or the message source.

PeekBySequenceNumberAsync(Int64)

Asynchronously reads the next message without changing the state of the receiver or the message source.

PeekBySequenceNumberAsync(Int64, Int32)

Peeks a batch of messages.

ReceiveAsync()

Receive a message from the entity defined by Path using ReceiveMode mode.

ReceiveAsync(Int32)

Receives a maximum of maxMessageCount messages from the entity defined by Path using ReceiveMode mode.

ReceiveAsync(Int32, TimeSpan)

Receives a maximum of maxMessageCount messages from the entity defined by Path using ReceiveMode mode.

ReceiveAsync(TimeSpan)

Receive a message from the entity defined by Path using ReceiveMode mode.

ReceiveDeferredMessageAsync(IEnumerable<Int64>)

Receives a IList<T> of deferred messages identified by sequenceNumbers.

ReceiveDeferredMessageAsync(Int64)

Receives a specific deferred message identified by sequenceNumber.

RegisterMessageHandler(Func<Message,CancellationToken,Task>, Func<ExceptionReceivedEventArgs,Task>)

Receive messages continuously from the entity. Registers a message handler and begins a new thread to receive messages. This handler(Func<T1, T2, TResult>) is awaited on every time a new message is received by the receiver.

RegisterMessageHandler(Func<Message,CancellationToken,Task>, MessageHandlerOptions)

Receive messages continuously from the entity. Registers a message handler and begins a new thread to receive messages. This handler(Func<T1, T2, TResult>) is awaited on every time a new message is received by the receiver.

RegisterPlugin(ServiceBusPlugin)

Registers a ServiceBusPlugin to be used with this receiver.

RenewLockAsync(Message)

Renews the lock on the message specified by the lock token. The lock will be renewed based on the setting specified on the queue.

RenewLockAsync(String)

Renews the lock on the message. The lock will be renewed based on the setting specified on the queue. New lock token expiry date and time in UTC format.

ThrowIfClosed()

Throw an OperationCanceledException if the object is Closing.

(Inherited from ClientEntity)
UnregisterPlugin(String)

Unregisters a ServiceBusPlugin.

Applies to