To get the output parameter values from an engine

// Retrieve the value of ruleset parameters declared with the Out modifier
IDictionary map = engine.GetParameterValues();

The rule engine API contains events that you can log to make sure that the ruleset executes correctly.

In ILOG Rules for .NET, you can trace rule execution using events.

The following sample shows how to trace:

When the events occur, the callbacks for the events are invoked. This implementation writes a string to the console window.

[C#]

public void MyMethod() {
// Create the rule engine
RuleEngine myEngine = new RuleEngine();
// Create the ruleset
RuleSet ruleset = new MyRuleSet();
// Register the 'RuleInstanceAdded'
// Agenda event
myEngine.Agenda.RuleInstanceAdded += new          AgendaEventHandler(Agenda_RuleInstanceAdded);
// Register the 'ObjectAsserted'
// WorkingMemory event
myEngine.WorkingMemory.ObjectAsserted += new          WorkingMemoryEventHandler(WorkingMemory_ObjectAsserted);
// Add an object into the working memory
myEngine.Assert(new MyBusinessObject());
// Launch the rule engine
myEngine.Execute();
// Reset the rule engine
myEngine.Reset();
}
private void Agenda_RuleInstanceAdded(object sender, 
             AgendaEventArgs args) {
    Console.WriteLine(instance + " added to the agenda.");
}
private void WorkingMemory_ObjectAsserted(object sender, 
             WorkingMemoryEventArgs args) {
    Console.WriteLine(obj + " added into the working memory.");
}
 

[Visual Basic]

Public Sub MyMethod()
` Create the rule engine
Dim myEngine As RuleEngine = New RuleEngine
` Create the ruleset
Dim ruleset As ruleset = New MyRuleSet
` Register the 'RuleInstanceAdded'
` Agenda event
AddHandler myEngine.Agenda.RuleInstanceAdded, _
AddressOf Agenda_RuleInstanceAdded
` Register the 'ObjectAsserted'
` WorkingMemory event
AddHandler myEngine.WorkingMemory.ObjectAsserted, _
AddressOf WorkingMemory_ObjectAsserted
` Add an object into the working memory
myEngine.Assert(New MyBusinessObject)
` Launch the rule engine
myEngine.Execute()
` Reset the rule engine
myEngine.Reset()
End Sub
Private Sub Agenda_RuleInstanceAdded(ByVal sender As Object, _
ByVal args As AgendaEventArgs)
Console.WriteLine(String.Concat(instance, " added to the agenda."))
End Sub `Agenda_RuleInstanceAdded
Private Sub WorkingMemory_ObjectAsserted(ByVal sender As Object, _
ByVal args As WorkingMemoryEventArgs)
Console.WriteLine(String.Concat(obj, " added into the working memory"))
End Sub `WorkingMemory_ObjectAsserted

See Also