IotHubBaseClient.SetIncomingMessageCallbackAsync Method
Definition
Important
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Sets a callback for receiving a message from the device or module queue using a cancellation token. This instance must be opened already.
public System.Threading.Tasks.Task SetIncomingMessageCallbackAsync (Func<Microsoft.Azure.Devices.Client.IncomingMessage,System.Threading.Tasks.Task<Microsoft.Azure.Devices.Client.MessageAcknowledgement>> messageCallback, System.Threading.CancellationToken cancellationToken = default);member this.SetIncomingMessageCallbackAsync : Func<Microsoft.Azure.Devices.Client.IncomingMessage, System.Threading.Tasks.Task<Microsoft.Azure.Devices.Client.MessageAcknowledgement>> * System.Threading.CancellationToken -> System.Threading.Tasks.TaskPublic Function SetIncomingMessageCallbackAsync (messageCallback As Func(Of IncomingMessage, Task(Of MessageAcknowledgement)), Optional cancellationToken As CancellationToken = Nothing) As TaskParameters
- messageCallback
- Func<IncomingMessage,Task<MessageAcknowledgement>>
The callback to be invoked when a cloud-to-device message is received by the client.
- cancellationToken
- CancellationToken
A cancellation token to cancel the operation.
Returns
Exceptions
Thrown if instance is not opened already.
Thrown when the operation has been canceled.
Remarks
Calling this API more than once will result in the callback set last overwriting any previously set callback. A method callback can be unset by setting messageCallback to null.
