Dependency Property Returns Default value always

Question

Hi,

I have used the dependency property in StateInitializtion Activity as follows

1. CustomActivity (contains a dependency property of type bool, which will be set during the execution of this activity)

2. An if-else activity which executes if the above dependecy propery is value is true.

But regardless of any value set to the dependency property the value returned is always false. I have provided the code of custom activity below

public partial class MyCustomActivity : System.Workflow.ComponentModel.Activity
    {
        private static DependencyProperty MyCustomStatusProperty = DependencyProperty.RegisterAttached("MyCustomStatus", typeof(bool), typeof(MyCustomActivity));
        private bool _asStatus;
        public MyCustomActivity()
        {
            InitializeComponent();
        }

        protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
        {
            var executionStatus = base.Execute(executionContext);
      
            var result = true;// <based on db operation bool value will be set
            SetValue(MyCustomStatusProperty, result;
            _asStatus = result;
            return executionStatus;
        }

        public bool MyCustomStatus
        {
            get
            {
                var dpValue = (bool)GetValue(MyCustomStatusProperty);
                return dpValue ;
            }
            set
            {
                SetValue(MyCustomStatusProperty, value);
            }
        }
    }

and in the if condition I have given as "this.customActivity1.MyCustomStatus.

But it returned false alway.

Thanks and regards,

---

Vijay Pandurangan

Answer 1

This is because of activity execution context: http://msdn.microsoft.com/en-us/magazine/cc163414.aspx

That should give you what you need. An easy work around is to add a variable to your WF base class and then copy the value to the base class first and in your conditional code you can simply do

this.BaseClassVariable =! false

---

If my response answers your question, please mark it as the "Answer" by clicking that button above my post.

My blog: http://www.RyanVice.net/

Answer 2

Hi,Vijay

-"copy the value to the base class first "
You can copy the value to parent class by:
this.Parent.GetActivityByName("MyCustomActivity").MyCustomStatus=MyCustomStatus;

Regards

---

This posting is provided "AS IS" with no warranties, and confers no rights. Microsoft Online Community Support

Answer 3

Hi Ryan and Andrew,

Thanks for you reply.

In my situation, the custome activity can go to any where in the workflow

as

Main Workflow -> (State-> Stateinitialization Or Event Drive Activity Or Some other Custome Composite Activity)

And the property will be accessed by another custom/built in activity which may in the same tree of in some other tree of activities, and hence to acces the parent (Main Workflow) I may need to loop/traverse through the activities.

So I acheived this with a Activity Bind property from the Main Workflow.


Thanks for your replies.

Thanks and Regards,

---

Vijay Pandurangan