ClientBase<TChannel>.InvokeAsync Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Provides support for implementing the event-based asynchronous pattern.

For more information about

this pattern, see Event-based Asynchronous Pattern Overview.

Namespace:  System.ServiceModel
Assembly:  System.ServiceModel (in System.ServiceModel.dll)


Protected Sub InvokeAsync ( _
    beginOperationDelegate As ClientBase<(Of <(<'TChannel>)>)>..::..BeginOperationDelegate, _
    inValues As Object(), _
    endOperationDelegate As ClientBase<(Of <(<'TChannel>)>)>..::..EndOperationDelegate, _
    operationCompletedCallback As SendOrPostCallback, _
    userState As Object _
protected void InvokeAsync(
    ClientBase<(Of <(<'TChannel>)>)>..::..BeginOperationDelegate beginOperationDelegate,
    Object[] inValues,
    ClientBase<(Of <(<'TChannel>)>)>..::..EndOperationDelegate endOperationDelegate,
    SendOrPostCallback operationCompletedCallback,
    Object userState


  • inValues
    Type: array<System.Object[]
    The input values to the asynchronous call.
  • userState
    Type: System.Object
    The userState object to associate with the asynchronous call.


Provide a unique value, such as a GUID or hash code, in the userState parameter for each call to InvokeAsync(BeginOperationDelegate, array<Object[], EndOperationDelegate, SendOrPostCallback, Object), and when each operation is completed, your event handler can determine which instance of the operation raised the completion event.

Version Information


Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Windows Phone OS 7.0


For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.