ImpersonationOption Enumeration


The .NET API Reference documentation has a new home. Visit the .NET API Browser on to see the new experience.

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

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

public enum 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 double Add(double n1, double n2)
          double result = n1 + n2;
          Console.WriteLine("Received Add({0},{1})", n1, n2);
          Console.WriteLine("Return: {0}", result);
	return result;

.NET Framework
Available since 3.0
Return to top