应用内购买时出现COMException

Question

I set up a button to call following method:

private async void buyTimeUP()
{
    await CurrentApp.RequestProductPurchaseAsync("MyItem", false);
    DoFullFillment();
}

when I buy/download this item, everything is fine and the following code runs just fine:

public void DoFullFillment()
{
    var productLicenses = CurrentApp.LicenseInformation.ProductLicenses;
    checkTransaction(productLicenses["MyItem"]);
}

private void checkTransaction(ProductLicense lic)
{
     if (lic.IsConsumable && lic.IsActive)
     {
         Debug.WriteLine("License bought");
         CurrentApp.ReportProductFulfillment(lic.ProductId);
      }
}

But if the user returns from the in-app dialog with the back-button or if he cancels the transaction, the code crashes at

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at MyApp.Shop.<buyTimeUP>d__0.MoveNext()

How can I get rid of this bug?

Answer 1

to fix this add try/catch around RequestProductPurchaseAsync method call...

try
{
   receipt = await CurrentApp.RequestProductPurchaseAsync("MyItem", false);
}
catch (Exception){}