處理Windows App Store應用內購買收據

Question

我想在這種情況下處理情況，用戶在此機器上執行購買，但在另一臺機器上運行該功能。

我知道我必須檢查收據。我想知道，這是否是正確的方法？請注意，我繞過簽名檢查。因爲我需要建立一個我現在不想考慮的後端系統。我甚至無法在本地執行簽名檢查，因爲Windows 8 Store App不提供System.Security.Cryptography API。

我想知道，下面的代碼片段是否足以處理大多數情況？請注意，我無法測試代碼，因爲我需要發佈新版本，以便測試代碼。

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測試CurrentApp代碼。它對我來說很好。