[Windows Phone 8] Assign action to button press which switches to UI thread.

Hi there, I'm trying to implement IAP for my windows phone game.

In a unity script I define an Action<string,bool> Foo , and in the UI thread (mainpage.xaml) I want to assign that action a method defined in the UI thread.

Something like so:

UnityScript:

public event Action<string,bool> Foo;

void SomeGUIMethod()
{
if ( A button is clicked)
{
Foo("hello",true); //What I want to happen is for this to 'fire' off to the UI thread for the assigned method to be executed.
}
}

Sadly Foo is always null when I return to the Unity thread.

In my UI thread:

MainPage.xaml.cs

void Unity_Loaded()
{

var script = UnityEngine.Object.FindObjectOfType<MyScript>();

script.Foo += SomeMethod; //I assign the method an eventhandler
}

void Foo(string arg1, bool arg2)
{
//Do stuff
}

So yeah, what I intend to happen is after Unity_Loaded is executed, the action is assigned a method, and once it's called it'll fire off to the UI thread to do it's stuff, sadly as soon as I get back to the Unity thread the Action is null.

Can anyone give any insight into this? Has been bugging me all afternoon!

 

HI there, thank you both for the replies!

What I believe I was doing was was using the '+=' operator to assign rather than the assignment operator '='.

The fix I worked up was creating a static class with two Actions: InvokeUIThread and InvokeUnityThread,

Then in Unity_Loaded I assigned them public methods defined in the mainpage.xaml:

InvokeUIThread = Foo;

public void Foo(Action action)
{
Dispatcher.BeginInvoke( () =>
{
action();
}

And likewise with the InvokeUnity Action, but replacing Dispatcher.BeginInvoke with UnityApp.BeginInvoke.

Thanks again

 

If this SO question is yours, you should go back and answer it yourself with the solution you mentioned above: http://stackoverflow.com/questions/...ead-always-null-after-assignment-from-xaml-ui