Declaratively determining if an action runs, or a item template unfolds

Declaratively determining if an action runs, or a item template unfolds

• annag

  We don't have such an attribute on any action, but you could fairly easily create your own "ConditionalAction" base class with this capability. The steps would be:
  
  1 - Create an abstract IAction-implementing action, like "ConditionalAction".
  2 - Implemement IConfigurable interface
  3 - Receive and store an attribute of your choice with the condition, such as "Condition"
  4 - Implementations of Execute and Undo should: a) evaluate the condition, and if true, b) call an OnExecute or OnUndo abstract method, to be implemented by derived classes.
  5 - Evaluation of the condition can be achieved through a service implementation provided by the framework. The code would look like the following:
  
  private bool ShouldExecute(string expression)
  {
        ExpressionEvaluationService evaluator = new ExpressionEvaluationService();
        IDictionaryService dictservice = (IDictionaryService)
              ServiceHelper.GetService(this, typeof(IDictionaryService));
        return (bool) evaluator.Evaluate(expression, new ServiceAdapterDictionary(dictservice));
  }
  
  The evaluation service is the same one used by the ExpressionEvaluatorValueProvider, which is similar to the syntax of MSBuild properties: $(ArgumentName.APropertyMaybeOfTheArgumentValue)
  
  If the argument is a boolean, the first segment of the expression is all you need: "$(BoolArgument)".
  
  HTH
  
  
  

• Akhraden

  I couldn't resolve the interface IConfigurable to any library in the GAT/X, .NET, but would these two bases be an alternative

  • Microsoft.Practices.Common.IAttributesConfigurable

  • Microsoft.Practices.RecipeFramework.ConfigurableAction

  
  

• John Hennesey

  Apols for not being clear.
  
  For example: I have a boolean argument. It is populated by a wizard with a UI label like 'Would you like a help page generated '.  I use common actions to generate the help page. Could i turn off my 'GenerateHelpPage' action without using code ie is there a 'RunThisAction' parameter that takes a boolean arguement
  
  Thanks
  
  

• Roger Cheng - MSFT

  If you mean to declare what to do when an action fails, then the answer is No. GAX executes all actions in a sequence and if any of them fails, it tries reversing the ones already executed.< xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

   

  I don't quite understand what you mean when you say "I would like to be able to use a boolean argument populated from a wizard". Can you describe the scenario in bit more detail  
  
  -- Wojtek  

  
  
  
• Declaratively determining if an action runs, or a item template unfolds