问如何确定Windows应用程序的附加订阅是在试用期还是在付费期

EN

public enum LicenseStatus
{
    Unknown = 0,
    Trial,
    Full
}

private static StoreContext _context;

public static async Task<(string storeId, LicenseStatus status, DateTimeOffset acquiredDate)[]> GetSubscriptionAddonStatusesAsync()
{
    if (_context is null)
        _context = StoreContext.GetDefault();

    StoreProductQueryResult queryResult = await _context.GetUserCollectionAsync(new[] { "Durable" });
    if (queryResult.ExtendedError != null)
        throw queryResult.ExtendedError;

    IEnumerable<(string, LicenseStatus, DateTimeOffset)> Enumerate()
    {
        foreach (KeyValuePair<string, StoreProduct> pair in queryResult.Products)
        {
            StoreSku sku = pair.Value.Skus.FirstOrDefault();
            StoreCollectionData data = sku?.CollectionData;
            if (data != null)
            {
                LicenseStatus status = data.IsTrial ? LicenseStatus.Trial : LicenseStatus.Full;
                yield return (pair.Key, status, data.AcquiredDate);
            }
        }
    }

    return Enumerate().ToArray();
}

subscriptionStoreProduct = await GetSubscriptionProductAsync();
if (subscriptionStoreProduct == null)
{
    return;
}
// Check if the first SKU is a trial and notify the customer that a trial is available.
// If a trial is available, the Skus array will always have 2 purchasable SKUs and the
// first one is the trial. Otherwise, this array will only have one SKU.
StoreSku sku = subscriptionStoreProduct.Skus[0];
if (sku.SubscriptionInfo.HasTrialPeriod)
{
    // You can display the subscription trial info to the customer here. You can use 
    // sku.SubscriptionInfo.TrialPeriod and sku.SubscriptionInfo.TrialPeriodUnit 
    // to get the trial details.
}
else
{
    // You can display the subscription purchase info to the customer here. You can use 
    // sku.SubscriptionInfo.BillingPeriod and sku.SubscriptionInfo.BillingPeriodUnit
    // to provide the renewal details.
}