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.

[System.Diagnostics.DebuggerNonUserCode]
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
Available since 3.5
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