Passing parameter from Parent Activity to Child Activity

Question

I have few custom native activities.

Any activity can appear into any other and I have to pass parameter from parent activity to child but I am not able to.

Please see sample code.

public sealed class Activity1 : NativeActivity
{
	public InOutArgument<ClassAbc> ClassAbc { get; set; }
	public Activity Body { get; set; }
	
	protected override void CacheMetadata(NativeActivityMetadata metadata)
	{
		RuntimeArgument argument1 = new RuntimeArgument("ClassAbc", typeof(ClassAbc), ArgumentDirection.InOut);
		metadata.Bind(ClassAbc, argument1);
		metadata.AddArgument(argument1);
		
		DelegateInArgument<ClassAbc> delegateInArgument = new DelegateInArgument<ClassAbc>() { Name = "ClassAbc" };
		activityAction = new ActivityAction<ClassAbc>()
		{
			Argument = delegateInArgument,
			DisplayName = Guid.NewGuid().ToString(),
			Handler = Body
		};
		metadata.AddDelegate(activityAction);
	}
	
	protected override void Execute(NativeActivityContext context)
    {
		ClassAbc classAbc = new ClassAbc();
		classAbc.RecordNumber = 100;
		context.ScheduleAction<RecordNumberResponse>(activityAction, classAbc, Completed);
    }
	
	private void Completed(NativeActivityContext context, ActivityInstance instance)
    {
	}
}

public sealed class Activity2 : NativeActivity
{
	public InOutArgument<ClassAbc> ClassAbc { get; set; }
	public Activity Body { get; set; }
	
	protected override void CacheMetadata(NativeActivityMetadata metadata)
	{
		RuntimeArgument argument1 = new RuntimeArgument("ClassAbc", typeof(ClassAbc), ArgumentDirection.InOut);
		metadata.Bind(ClassAbc, argument1);
		metadata.AddArgument(argument1);
		
		DelegateInArgument<ClassAbc> delegateInArgument = new DelegateInArgument<ClassAbc>() { Name = "ClassAbc" };
		activityAction = new ActivityAction<ClassAbc>()
		{
			Argument = delegateInArgument,
			DisplayName = Guid.NewGuid().ToString(),
			Handler = Body
		};
		metadata.AddDelegate(activityAction);
	}
	
	protected override void Execute(NativeActivityContext context)
    {
		ClassAbc classAbc = new ClassAbc();
		classAbc.RecordNumber = 100;
		context.ScheduleAction<RecordNumberResponse>(activityAction, classAbc, Completed);
    }
	
	private void Completed(NativeActivityContext context, ActivityInstance instance)
    {
	}
}

I should be able to pass Activity1 in Activity2 using Property Body and vice-versa. And they should be able to parent should be able to pass ClassAbc to child activity.

But while executing above code value is coming as Null. I am sure I am doing soemthing wrong but not sure what and how to fix that.

Please advice.

---

Software Engineer

Answer 1

You cannot pass a value directly from one activity to another, for further help you can read Jacob's blog http://blogs.msdn.com/b/rjacobs/archive/2011/05/25/passing-values-between-workflow-activities.aspx

Answer 2

Hello Arvand,

Thanks for your response.

I went through the link you posted I have already tried that that works like any other In or InOut parameter works but with increasing complexity in my applicaiton it's not useful.

If I will go with above method then I will have access to that parameter even if my activity is not a child activity. This is not acceptable in my case.

regards,

---

Software Engineer