ImpersonationOption Enumeration


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Specifies the impersonation behavior for a service operation on a service instance.

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

Public Enumeration ImpersonationOption

Member nameDescription

Impersonation is performed if credentials are available and ImpersonateCallerForAllOperations is equal to true.


Impersonation is not performed. If ImpersonateCallerForAllOperations is equal to true, a validation exception occurs at service startup time.


Impersonation is required.

Use the ImpersonationOption enumeration to control impersonation in Windows Communication Foundation (WCF) applications.

This setting interacts with a configuration property on ImpersonateCallerForAllOperations in the following table.

The following code example on the service shows how to have a method impersonate the caller by using the OperationBehaviorAttribute to set the impersonation level.

<OperationBehavior(Impersonation := ImpersonationOption.Required)> _
Public Function Add(ByVal n1 As Double, ByVal n2 As Double) As Double Implements ICalculator.Add
          Dim result = n1 + n2
	Console.WriteLine("Received Add({0},{1})", n1, n2)
	Console.WriteLine("Return: {0}", result)
	Return result
End Function

.NET Framework
Available since 3.0
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