Schedule of DynamicActivity children loaded from external XAML with parameters

Question

Scenario : I implement a parent activity that performs another activity from an external source (database), following this post by Ron Jacobs .

This approach works, but I have several problems in my case, because WorkflowInvoker does not receive parent extensions:

• Tracking disabled for children
• My user extension for sharing does not work
• Extensions may vary depending on the host, so I can’t just add new ones.

Potential solution : Instead of Invoke for XAML children, I plan it (I believe that it will solve my problems, right?).

CacheMetadata: Download DynamicActivityfrom an external source and call metadata.AddChild(_childActivity);.

Then do:

    protected override void Execute(NativeActivityContext context)
    {
        context.ScheduleActivity(_childActivity, OnActivityComplete);
    }

And it worked! The next step is to pass the arguments In, Out, and InOut to the children.

Problem : Schedule for children DynamicActivity loaded from external XAML with parameters InArgument, OutArgument and InOutArgument

Something I do, but only works for OutArguments. In CacheMetadataI called my method_childActivity.BindArguments

    public static void BindArguments(this DynamicActivity activity, IDictionary<string, Argument> argumentsToBind)
    {
        if (argumentsToBind == null)
            return;

        Type genericPropType, valueType, sourceArgumentType, vbReferenceType;
        Argument sourceArgument;
        foreach (var destinyArgument in activity.Properties)
        {
            if (!argumentsToBind.TryGetValue(destinyArgument.Name, out sourceArgument))
                continue;

            genericPropType = destinyArgument.Type.GetGenericTypeDefinition();
            if (genericPropType == typeof(InArgument<>))
            {
                destinyArgument.Value = new InArgument<string>("It worked! But I need the value from context which is unavaliable since I'm inside CacheMetadata");
            }
            else
            {
                valueType = destinyArgument.Type.GetGenericArguments()[0];
                sourceArgumentType = genericPropType.MakeGenericType(valueType);

                if (sourceArgument != null)
                {
                    vbReferenceType = typeof(VisualBasicReference<>).MakeGenericType(valueType);

                    object vbReference = Activator.CreateInstance(vbReferenceType,
                        GetExpressionText(sourceArgument, sourceArgumentType));

                    object referenceArgument = Activator.CreateInstance(sourceArgumentType, vbReference);

                    destinyArgument.Value = referenceArgument;
                }
            }
        }
    }

So , I need to pass InArguments and InOutArguments, but I need a value from the context, which is impossible, since I'm inside CacheMetadata.

I tried to set DynamicActivityProperty.Valuein the method Execute. But that didn't work either.

After that, I founded this page , which can help you understand my script.

Answer 1

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