Question

I tried the following code for in-app purchase. I’m using CurrentAppSimulator for testing purpose.

private async void history_Click(object sender, RoutedEventArgs e)
{
    bool OK = true;

    // Get the license info
    // The next line is commented out for testing.
    // licenseInformation = CurrentApp.LicenseInformation;

    // The next line is commented out for production/release.       
    LicenseInformation licenseInformation = CurrentAppSimulator.LicenseInformation;
    if (!licenseInformation.ProductLicenses["PremiumFeatures"].IsActive)
    {
        try
        {
            // The customer doesn't own this feature, so 
            // show the purchase dialog.

            await CurrentAppSimulator.RequestProductPurchaseAsync("PremiumFeatures", false);
            // the in-app purchase was successful
            OK = true;
        }
        catch (Exception)
        {
            // The in-app purchase was not completed because 
            // an error occurred.
            OK = false;
        }
    }
    else
    {
        // The customer already owns this feature.
        OK = true;
    }

    if (OK)
    {
        Frame.Navigate(typeof(HistoryPage));
    }
}

However, the dialog keep pop up, every time I perform history_Click, even I choose S_OK. I expect licenseInformation.ProductLicenses["PremiumFeatures"].IsActive should changed to true, after I buy the PremiumFeatures.

I guess, perhaps when the in-app purchase was successful, I need to turn on IsActive flag, so that it will not show me purchase dialog again.

        // the in-app purchase was successful
        OK = true;
        // Compile error!!!
        licenseInformation.ProductLicenses["PremiumFeatures"].IsActive = true;

OK. Seems like IsActive is a read only field. So, may I know, what is the correct way to handle purchase successful case?

Update :

After looking at Trial app and in-app purchase sample, I realize having the following code can have IsActive changed from false to true automatically, after purchasing successful. (But why it works?)

    private async Task LoadInAppPurchaseProxyFileAsync()
    {
        StorageFolder proxyDataFolder = await Package.Current.InstalledLocation.GetFolderAsync("data");
        StorageFile proxyFile = await proxyDataFolder.GetFileAsync("in-app-purchase.xml");
        licenseChangeHandler = new LicenseChangedEventHandler(InAppPurchaseRefreshScenario);
        CurrentAppSimulator.LicenseInformation.LicenseChanged += licenseChangeHandler;
        await CurrentAppSimulator.ReloadSimulatorAsync(proxyFile);

        // setup application upsell message
        ListingInformation listing = await CurrentAppSimulator.LoadListingInformationAsync();
        var product1 = listing.ProductListings["product1"];
        var product2 = listing.ProductListings["product2"];
        Product1SellMessage.Text = "You can buy " + product1.Name + " for: " + product1.FormattedPrice + ".";
        Product2SellMessage.Text = "You can buy " + product2.Name + " for: " + product2.FormattedPrice + ".";
    }

However, the “Is already bought” status is not persistence. If I close the app and start it again, it will thought my “Premium Feature” to “is not bought yet”.

How am I suppose the make this behavior persistence?

Answer 1

As far as I know it’s not automatically updated when you click OK. It only returns the correct status like it should do in the Windows Store.

What I think is an option to do, but I haven’t implemented it myself is to use ReloadSimulatorAsync(proxyFile) method. Before you call this method you have to update the in-app-purchase.xml yourself save it and pass the file to the ReloadSimulatorAsync method.

Personally I would use the manual update of the xml file. But I can’t Judge about that for your application / application flow.

A good start for automating this process is the sample “In-app purchase” app which you can find here. If you look in the code file InAppPurchase.xaml.cs you will see already a bit of code for your own implementation.