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ImpersonationOption Enumeration

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
AllowedImpersonation is performed if credentials are available and ImpersonateCallerForAllOperations is equal to true.
NotAllowedImpersonation is not performed. If ImpersonateCallerForAllOperations is equal to true, a validation exception occurs at service startup time.
RequiredImpersonation 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);
			DisplayIdentityInformation();
			return result;
        }

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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