C# win10通用应用程序后台任务未运行
我有一个精简的Windows10Universal应用程序(VS2015),它有一个后台任务,应该是更新一个实时互动程序,但它似乎不起作用。我用两个按钮创建了一个基本的XAML页面:“启用”和“禁用”。启用按钮注册后台任务,禁用按钮取消注册 主应用程序(App6)MainPage.cs文件的代码:C# win10通用应用程序后台任务未运行,c#,windows-10-universal,C#,Windows 10 Universal,我有一个精简的Windows10Universal应用程序(VS2015),它有一个后台任务,应该是更新一个实时互动程序,但它似乎不起作用。我用两个按钮创建了一个基本的XAML页面:“启用”和“禁用”。启用按钮注册后台任务,禁用按钮取消注册 主应用程序(App6)MainPage.cs文件的代码: using System; using System.Collections.Generic; using System.Threading.Tasks; using Windows.Applicat
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Windows.ApplicationModel.Background;
using Windows.UI.Popups;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
namespace App6
{
public sealed partial class MainPage : Page
{
private string TN = "APP6_TASK";
private string TEP = "App6BackgroundTask2.BackgroundTaskHelper";
public MainPage()
{
InitializeComponent();
}
private void Enable(object sender, RoutedEventArgs e)
{
try { RegisterTask(); }
catch(Exception ex) { ShowDialog(ex.ToString()); }
}
private void Disable(object sender, RoutedEventArgs e)
{
try { UnregisterTask(); }
catch (Exception ex) { ShowDialog(ex.ToString()); }
}
private async void ShowDialog(string message)
{
var dlg = new MessageDialog(message);
await dlg.ShowAsync();
}
public void RegisterTask()
{
//no need to register a task that already exists
if (GetTask()) { return; }
var backgroundTaskBuilder = new BackgroundTaskBuilder() { Name = TN, TaskEntryPoint = TEP };
backgroundTaskBuilder.SetTrigger(new TimeTrigger(15, false));
backgroundTaskBuilder.Register();
}
public void UnregisterTask()
{
var task = new KeyValuePair<Guid, IBackgroundTaskRegistration>();
//no need to unregister a task that doesn't exist
if (GetTask(ref task))
{
task.Value.Unregister(true);
}
}
public bool GetTask()
{
foreach (var t in BackgroundTaskRegistration.AllTasks)
{
if (t.Value.Name == TN)
{
return true;
}
}
return false;
}
public bool GetTask(ref KeyValuePair<Guid, IBackgroundTaskRegistration> task)
{
foreach (var t in BackgroundTaskRegistration.AllTasks)
{
if (t.Value.Name == TN)
{
task = t;
return true;
}
}
return false;
}
}
}
我在解决方案中添加了第二个项目,并从主应用程序中引用了它。该项目中唯一类(BackgroundTaskHelper.cs)的代码为:
使用系统;
使用系统诊断;
使用Windows.ApplicationModel.Background;
使用Windows.Data.Xml.Dom;
使用Windows.UI.Notifications;
命名空间App6BackgroundTask2
{
公共密封类BackgroundTaskHelper:IBackgroundTask
{
公共无效运行(IBackgroundTaskInstance taskInstance)
{
var backgroundtaskderal=taskInstance.getDeleral();
请尝试{updateile();}
catch(异常ex){Debug.WriteLine(ex);}
最后{backgroundTaskDeleral.Complete();}
}
私有void updateile()
{
var now=DateTime.now.ToString(“HH:mm:ss”);
var-xml=
"" +
" " +
" " +
“”+现在+“”+
" " +
" " +
“”+现在+“”+
" " +
" " +
“”+现在+“”+
" " +
" " +
“”+现在+“”+
" " +
" " +
"";
var tileDom=new XmlDocument();
LoadXml(xml);
var瓷砖=新瓷砖化(瓷砖化);
TileUpdateManager.CreateTileUpdateForApplication().Update(平铺);
}
}
}
我已在调试模式下运行主应用程序,单击“启用”注册后台任务,从Debug.Location工具栏暂停任务,并验证任务的run方法已执行且未引发异常。当我检查“开始”菜单时,互动程序将按预期更新。当我关闭应用程序并等待时,互动程序将不再更新
我卸载了应用程序,重新编译为发行版,并从“开始”菜单运行它(不在IDE中运行)。我点击“启用”按钮注册后台任务,关闭应用程序并等待。互动程序从未更新过
看来我遗漏了什么,但我不知道是什么。感谢您的帮助。Thanx我找到了答案
我在package.appxmanifest的Declarations选项卡中选择了“System event”任务类型(除了“Timer”任务类型之外)
我还在“应用程序”选项卡的“锁定屏幕通知”选择框中选择了“徽章和平铺文本”
我在VisualAssets选项卡中为徽章徽标选择了“Assets\LockScreenLogo.png”
最后,我修改了我的注册任务例程
public async Task RegisterTask()
{
var backgroundAccessStatus = await BackgroundExecutionManager.RequestAccessAsync();
if (backgroundAccessStatus == BackgroundAccessStatus.Denied) { return; }
if (GetTask()) { return; }
var timeTrigger = new TimeTrigger(15, false);
var backgroundTaskBuilder = new BackgroundTaskBuilder();
backgroundTaskBuilder.Name = TASK_NAME;
backgroundTaskBuilder.TaskEntryPoint = typeof(BackgroundTileTimerTask.BackgroundTask).FullName;
backgroundTaskBuilder.SetTrigger(timeTrigger);
backgroundTaskBuilder.Register();
}
这似乎成功了
我已经将代码和how to PDF添加到GitHub中:我认为
系统事件
为我做到了这一点。但我在研究过程中在某个地方读到,建议在每次应用启动时注销并注册一个新任务。这可能是版本更新后的问题。
using System;
using System.Diagnostics;
using Windows.ApplicationModel.Background;
using Windows.Data.Xml.Dom;
using Windows.UI.Notifications;
namespace App6BackgroundTask2
{
public sealed class BackgroundTaskHelper : IBackgroundTask
{
public void Run(IBackgroundTaskInstance taskInstance)
{
var backgroundTaskDeferral = taskInstance.GetDeferral();
try { UpdateTile(); }
catch (Exception ex){ Debug.WriteLine(ex); }
finally { backgroundTaskDeferral.Complete(); }
}
private void UpdateTile()
{
var now = DateTime.Now.ToString("HH:mm:ss");
var xml =
"<tile>" +
" <visual>" +
" <binding template='TileSmall'>" +
" <text>" + now + "</text>" +
" </binding>" +
" <binding template='TileMedium'>" +
" <text>" + now + "</text>" +
" </binding>" +
" <binding template='TileWide'>" +
" <text>" + now + "</text>" +
" </binding>" +
" <binding template='TileLarge'>" +
" <text>" + now + "</text>" +
" </binding>" +
" </visual>" +
"</tile>";
var tileDom = new XmlDocument();
tileDom.LoadXml(xml);
var tile = new TileNotification(tileDom);
TileUpdateManager.CreateTileUpdaterForApplication().Update(tile);
}
}
}
public async Task RegisterTask()
{
var backgroundAccessStatus = await BackgroundExecutionManager.RequestAccessAsync();
if (backgroundAccessStatus == BackgroundAccessStatus.Denied) { return; }
if (GetTask()) { return; }
var timeTrigger = new TimeTrigger(15, false);
var backgroundTaskBuilder = new BackgroundTaskBuilder();
backgroundTaskBuilder.Name = TASK_NAME;
backgroundTaskBuilder.TaskEntryPoint = typeof(BackgroundTileTimerTask.BackgroundTask).FullName;
backgroundTaskBuilder.SetTrigger(timeTrigger);
backgroundTaskBuilder.Register();
}