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ReceiveActivity.OperationValidation Event

Occurs when a message is received for an operation and validation is required.

Namespace:  System.Workflow.Activities
Assembly:  System.WorkflowServices (in System.WorkflowServices.dll)

public event EventHandler<OperationValidationEventArgs> OperationValidation

This is an optional event handler that is fired when the ReceiveActivity activity is about to receive a message. The associated handler can be used to perform ClaimSet-based security checks to authorize client invocation of the service operation implemented by the ReceiveActivity activity.

Setting OperationValidationEventArgs.IsValid to false in the event handler rejects the service operation invocation and the client receives a FaultException. If OperationValidationEventArgs.IsValid is set to true, then the service operation invocation succeeds and the ReceiveActivity activity receives and processes the message.

The following example shows how to use the OperationValidation event.

        private void InitializeComponent()
            ReceiveActivity receiveActivity1 = new ReceiveActivity();
            receiveActivity1.OperationValidation += new EventHandler<OperationValidationEventArgs>(receiveActivity1_OperationValidation);

        void receiveActivity1_OperationValidation(object sender, OperationValidationEventArgs e)
            OperationContext context = OperationContext.Current;
            bool authorized = false;
            foreach (ClaimSet claims in context.ServiceSecurityContext.AuthorizationContext.ClaimSets)
                if (claims.ContainsClaim(AuthorizedClaim))
                    authorized = true;
            e.IsValid = authorized;  

.NET Framework

Supported in: 4, 3.5

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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