【发布时间】:2014-09-19 21:03:04
【问题描述】:
我正在使用 GeoFence API 编写 Windows Phone 8.1 应用程序。我的问题是我无法在后台任务中触发位置更改,因为应用程序以代码 1 退出。
我已阅读有关此错误的多个主题,但没有解决方案解决我的问题。
- 我检查了我的 BackgroundTask 是否是运行时组件,并且确实是。
- 我检查了我的班级名称,它是正确的。
- 我检查了我是否在 BackgroundTask 函数中使用了任何 await 函数,但没有找到。
- 我检查了我是否在应用清单中注册了后台任务,是的,我做了(入口点 ofc)
实际上在从 BackgroundTask 运行 Run 函数之前就出现了错误。
namespace BackgroundTask
{
public sealed class geoFenceBackgroundTask : IBackgroundTask
{
public void Run(IBackgroundTaskInstance taskInstance)
{
ToastTemplateType toastTemplate = ToastTemplateType.ToastText02;
XmlDocument toastXml = ToastNotificationManager.GetTemplateContent(toastTemplate);
XmlNodeList toastTextElements = toastXml.GetElementsByTagName("text");
toastTextElements[0].AppendChild(toastXml.CreateTextNode("MY APP"));
toastTextElements[1].AppendChild(toastXml.CreateTextNode("Test"));
//IXmlNode toastNode = toastXml.SelectSingleNode("/toast");
//XmlElement audio = toastXml.CreateElement("audio");
ToastNotification toast = new ToastNotification(toastXml);
ToastNotificationManager.CreateToastNotifier().Show(toast);
}
}
}
还有我的注册功能:
async private void RegisterBackgroundTask()
{
// Get permission for a background task from the user. If the user has already answered once,
// this does nothing and the user must manually update their preference via PC Settings.
BackgroundAccessStatus backgroundAccessStatus = await BackgroundExecutionManager.RequestAccessAsync();
// Regardless of the answer, register the background task. If the user later adds this application
// to the lock screen, the background task will be ready to run.
// Create a new background task builder
BackgroundTaskBuilder geofenceTaskBuilder = new BackgroundTaskBuilder();
geofenceTaskBuilder.Name = "geoFenceBackgroundTask";
geofenceTaskBuilder.TaskEntryPoint = "BackgroundTask.geoFenceBackgroundTask";
// Create a new location trigger
var trigger = new LocationTrigger(LocationTriggerType.Geofence);
// Associate the locationi trigger with the background task builder
geofenceTaskBuilder.SetTrigger(trigger);
// If it is important that there is user presence and/or
// internet connection when OnCompleted is called
// the following could be called before calling Register()
// SystemCondition condition = new SystemCondition(SystemConditionType.UserPresent | SystemConditionType.InternetAvailable);
// geofenceTaskBuilder.AddCondition(condition);
// Register the background task
var geofenceTask = geofenceTaskBuilder.Register();
geofenceTask.Completed += (sender, args) =>
{
// MY CODE HERE
};
geofenceTask = geofenceTaskBuilder.Register();
}
我没有其他想法。有什么帮助吗?
【问题讨论】:
标签: c# windows-phone-8.1