挂起事件中的异步WCF调用 [英] async WCF call in Suspending event

问题描述

我刚刚开始开发win8应用程序. Win8应用程序关闭事件不存在，只有暂停事件.我有一个应用程序，当用户关闭该应用程序时，该应用程序应该从数据库中注销.我有一个处理数据库操作的WCF服务.我从暂停事件中调用WCF服务，但它对数据库没有任何影响.如果我从其他任何地方调用它，我肯定可以正常工作.

任何帮助将是巨大的，在此先感谢.

Hy there,

I''ve just started develop apps to win8. Win8 app closing event does not exist, only suspended event. I''ve and app, that should log out from a database, when the user close the app. I have a WCF service that handle the database operations. I call the WCF service from suspending event, but it doesnt make any effect on database. I am sure that this works fine, if i call it from anywhere else.

Any help would be great, thanks in advance.

private async void Current_Suspending(object sender, Windows.ApplicationModel.SuspendingEventArgs e)
        {
            await service.SetUserOnlineStatusAsync(UserId, 0);
        }

推荐答案

我最近读过类似的文章，但我自己没有尝试过，但是在我看来，运行时可以取消您的操作. br/>
尝试通过请求 SuspendingDeferral来通知您的未完成操作的运行时 [ ^ ]:

I recently read about something similar and i did not try it out myself, but it seems to me like the runtime cancells your operation.

try notifying the runtime of your outstanding operation by requesting a SuspendingDeferral[^]:

private async void Current_Suspending(object sender, Windows.ApplicationModel.SuspendingEventArgs e) {
            var deferral = e.SuspendingOperation.GetDeferral();
            await service.SetUserOnlineStatusAsync(UserId, 0);
            deferral.Complete()
        }

在任何情况下，您都应该意识到，如果暂停的期限已过"，则运行时将终止，无论在多大的时间范围内……如果您发现，请让我知道;)

in any case you should be aware that the runtime will terminate anyway, if the "deadline for suspension has passed" - whatever timespan this is...if you find out, let me know ;)

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