Question

如何更新WalletItem？我可以删除然后添加WalletItem但是当我这样做时，WalletItem的图块会从开始屏幕消失，我认为其他不好的事情也会发生。

如何更新WalletItem而不删除它？

Answer 1

使用商店的UpdateAsync方法。

为什么这样做有用的秘诀是当你通过WalletItemStore.GetItemsAsync()获得一张票时，WalletItems已经设置了Id。这是一个只读属性。因此，当您通过WalletItemStore.UpdateAsync()方法发回WalletItems时，商店会从WalletItem中读取ID。

这对我来说有点奇怪，至少因为WalletItemStore.AddAsync()接受Id作为参数而不是作为项目的属性。

示例：

var newTicket = MyService.GetTicket();

var store = await WalletManager.RequestStoreAsync();
var currentTickets = await store.GetItemsAsync();            

if (currentTickets.Count(x => x.Id == newTicket.SerialNumber) == 1)
{
    // the ticket exist so let's update it

    // get the "old" ticket from the Wallet store
    var ticket = currentItems.First(x => x.Id == newTicket.SerialNumber);

    // update the "old" ticket with the updated information
    ticket.DisplayName = newTicket.Name;
    ticket.BodyColor = Color.FromArgb(255, 255, 0, 0);

    // put the updated "old" ticket back in the store again
    await store.UpdateAsync(ticket);
}
else
{
    // the ticket does not exist so let's add it
    await store.AddAsync(newTicket.SerialNumber, new WalletItem(WalletItemKind.Ticket, newTicket.Name)
        {
            BodyFontColor = Color.FromArgb(255, 255, 255, 255),
            BodyColor = Color.FromArgb(255, 50, 50, 230),
            DisplayName = newTicket.Name,
            ExpirationDate = newTicket.ExpireDate,
            IssuerDisplayName = "My Company"
        });
}

如何更新WalletItem？

1 个答案: