处理Windows App Store应用内购买收据

Question

我想在这种情况下处理情况，用户在此机器上执行购买，但在另一台机器上运行该功能。

我知道我必须检查收据。我想知道，这是否是正确的方法？请注意，我绕过签名检查。因为我需要建立一个我现在不想考虑的后端系统。我甚至无法在本地执行签名检查，因为Windows 8 Store App不提供System.Security.Cryptography API。

我想知道，下面的代码片段是否足以处理大多数情况？请注意，我无法测试代码，因为我需要发布新版本，以便测试代码。

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

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

      String receipt = await CurrentApp.RequestProductPurchaseAsync("PremiumFeatures", true); 
      // the in-app purchase was successful 

      licenseInformation = CurrentApp.LicenseInformation; 
      if (licenseInformation.ProductLicenses["PremiumFeatures"].IsActive || receipt.Length > 0) 
      { 
       // In some situations, you may need to verify that a user made an in-app purchase. 
       // For example, imagine a game that offers downloaded content. If the user who 
       // purchased the content wants to play the game on another PC, you need to verify 
       // that the user purchased the content. 
       // 
       // Receipt is used to handle such situation. 
       // 
       // Validate receipt is complicated, as it requires us to setup a backend system. 
       // http://msdn.microsoft.com/en-US/library/windows/apps/jj649137 
       // 
       // I will just assume non empty receipt string means valid receipt. 
       OK = true; 
      } 
      else 
      { 
       OK = false; 
      } 
     } 
     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) 
    { 
     // Launch premium feature. 
     Frame.Navigate(typeof(HistoryPage)); 
    } 
} 

Answer 1

可以使用的，而不是CurrentAppSimulator测试CurrentApp代码。它对我来说很好。