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IParameterInspector.BeforeCall Method

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

Called before client calls are sent and after service responses are returned.

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

Syntax

'Declaration
Function BeforeCall ( _
    operationName As String, _
    inputs As Object() _
) As Object

Object BeforeCall(
    string operationName,
    Object[] inputs
)

Parameters

  • inputs
    Type: array<System.Object[]
    The objects passed to the method by the client.

Return Value

Type: System.Object
The correlation state that is returned as the correlationState parameter in AfterCall. Return nulla null reference (Nothing in Visual Basic) if you do not intend to use correlation state.

Remarks

On outbound calls from a client, the inspector is invoked before the request contents are serialized and sent to the service. The inspector is also called after the response has been deserialized but before the return values have been dispatched to the proxy method.

On inbound calls to a service, the inspector is invoked after the request contents are deserialized and dispatched to the service operation and before the response contents are serialized and sent to the client.

Examples

The following code example shows an IParameterInspector implementation that:

  • Writes the operation name and return value to the console after a response has been deserialized by the service or a request has been serialized by a client.

  • Writes the operation name to the console after deserializing a response on the client or after a response is serialized on the service.

The following code example shows how to use either System.ServiceModel.Description.IOperationBehavior or System.ServiceModel.Description.IEndpointBehavior to insert IParameterInspector objects.

Version Information

Silverlight

Supported in: 5, 4

Platforms

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