我即将失去它...我有两个应用程序正在处理更新实时磁贴的工作后台任务。下载，解析实时图块的数据，然后动态创建图像并将其用作实时图块的背景。
一天或两天都工作正常，但随后更新开始表现得非常奇怪。我的应用程序的前两天两个活动磁贴都像发条一样每28分钟更新一次。但随后他们开始跳过更新。当应用B不更新实时磁贴时，应用A通常会更新，以便它们不会同时更新，而且每小时只更新一次。简单来说，它们已经过时了。
这真是令人沮丧，因为我需要能够依赖每30分钟更新一次的瓷砖（如果我有足够的电池，良好的接收等等）。
我真的很感激，如果有人可以帮助我，也许可以查看我的代码，看看是否有可能搞乱更新间隔（比如没有正确调用NotifyComplete）。我删除了一些代码，并试图简化它。请询问您是否还需要其他任何内容来理解这一点。
过去两个月我一直试图解决这个问题，尝试使用不同的手机并仔细检查代码。
您的帮助比您所知道的更受欢迎。 提前谢谢。
My OnInvoke function:
Timer t = null;
ShellToast toast = new ShellToast();
try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri(strUrlHBH));
request.Accept = "*/*";
request.AllowAutoRedirect = true;
// disable caching.
request.Headers["Cache-Control"] = "no-cache";
request.Headers["Pragma"] = "no-cache";
t = new Timer(
state =>
{
if (string.Compare(state.ToString(), id, StringComparison.InvariantCultureIgnoreCase) == 0)
{
//logger.Write("Timeout reached for connection [{0}], aborting download.", id);
runNotifyComplete = false;
NotifyComplete();
request.Abort();
t.Dispose();
}
},
id,
timeout,
0);
request.BeginGetResponse(
r =>
{
try
{
if (t != null)
{
t.Dispose();
}
var httpRequest = (HttpWebRequest)r.AsyncState;
var httpResponse = (HttpWebResponse)httpRequest.EndGetResponse(r);
using (var reader = new StreamReader(httpResponse.GetResponseStream()))
{
var response = reader.ReadToEnd();
Deployment.Current.Dispatcher.BeginInvoke(new Action(() =>
{
try
{
//Parse the result
if (boolResult) //If we have a result
{
Grid grid = new Grid();
StackPanel sp = new StackPanel();
sp.Height = 173;
sp.Width = 173;
//StreamResourceInfo info = Application.GetResourceStream(new Uri("Pin-to-start2.png", UriKind.Relative));
if ((bool)settings["LiveTileMetro"] == true)
{
// create source bitmap for Image control (image is assumed to be alread 173x173)
/*WriteableBitmap wbmp2 = new WriteableBitmap(1, 1);
wbmp2.SetSource(info.Stream);
Image img = new Image();
img.Source = wbmp2;
// add Image to Grid
grid.Children.Add(img);
strBackBackground = "Pin-to-start2.png";
}
else
{*/
sp.Background = (SolidColorBrush)Application.Current.Resources["PhoneAccentBrush"];
//sp.Background.Opacity = 0.0;
strBackBackground = "";
}
StreamResourceInfo info;
//GC.Collect();
info = Application.GetResourceStream(new Uri("/MyApp;component/images/Icons/livetile/livetile.png", UriKind.Relative));
WriteableBitmap wbmp3 = new WriteableBitmap(1, 1);
try
{
wbmp3.SetSource(info.Stream);
}
catch
{
}
Image img3 = new Image();
img3.Source = wbmp3;
// add Image to Grid
img3.Width = 173;
img3.Height = 173;
img3.Margin = new Thickness { Left = 0, Bottom = 0, Right = 0, Top = 0 };
TextBlock txtTemperature = new TextBlock();
TextBlock txtTemperatureRing = new TextBlock();
txtTemperature.Foreground = new SolidColorBrush(Colors.White);
txtTemperature.Text = strTemp;
txtTemperature.TextAlignment = TextAlignment.Right;
txtTemperatureRing.Style = (Style)Application.Current.Resources["PhoneTextTitle3Style"];
txtTemperatureRing.FontFamily = new FontFamily("Segoe WP Light");
txtTemperatureRing.FontSize = 40;
txtTemperatureRing.Foreground = new SolidColorBrush(Colors.White);
txtTemperatureRing.Text = "°";
txtTemperatureRing.TextAlignment = TextAlignment.Right;
txtTemperature.FontFamily = new FontFamily("Segoe WP Light");
txtTemperature.FontSize = 60;
txtTemperature.Margin = new Thickness { Left = 0, Bottom = 0, Right = 0, Top = -75 };
txtTemperature.Height = 80;
txtTemperature.Width = 145;
txtTemperatureRing.Margin = new Thickness { Left = 128, Bottom = 0, Right = 0, Top = -97 };
txtTemperatureRing.Height = 50;
txtTemperatureRing.Width = 39;
sp.Children.Add(img3);
sp.Children.Add(txtTemperature);
sp.Children.Add(txtTemperatureRing);
//call measure, arrange and updatelayout to prepare for rendering
sp.Measure(new Size(173, 173));
sp.Arrange(new Rect(0, 0, 173, 173));
sp.UpdateLayout();
grid.Children.Add(sp);
WriteableBitmap wbmp = new WriteableBitmap(173, 173);
wbmp.Render(grid, null);
wbmp.Invalidate();
//write image to isolated storage
string sIsoStorePath = @"\Shared\ShellContent\tile.png";
using (IsolatedStorageFile appStorage = IsolatedStorageFile.GetUserStoreForApplication())
{
//ensure directory exists
String sDirectory = System.IO.Path.GetDirectoryName(sIsoStorePath);
if (!appStorage.DirectoryExists(sDirectory))
{
appStorage.CreateDirectory(sDirectory);
}
using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream(sIsoStorePath, System.IO.FileMode.Create, appStorage))
{
wbmp.SaveJpeg(stream, 173, 173, 0, 100);
}
}
/// If application uses both PeriodicTask and ResourceIntensiveTask
//ShellTile TileToFind = ShellTile.ActiveTiles.FirstOrDefault(x => x.NavigationUri.ToString().Contains("TileID=2"));
ShellTile TileToFind = ShellTile.ActiveTiles.First();
//test if Tile was created
if (TileToFind != null)
{
StandardTileData NewTileData = new StandardTileData
{
BackgroundImage = new Uri("isostore:Shared/ShellContent/tile.png", UriKind.Absolute),
Title = strTitle,
Count = null,
BackTitle = (string)settings["SelectedCityName"],
BackBackgroundImage = new Uri(strBackBackground, UriKind.Relative),
BackContent = strWind + Environment.NewLine + strPrecipitation
};
//ShellTile.Create(new Uri("/MainPage.xaml?TileID=2", UriKind.Relative), NewTileData);
TileToFind.Update(NewTileData);
}
}
if (runNotifyComplete == true)
{
runNotifyComplete = false;
NotifyComplete();
}
}//If matches.count
}
catch
{
if (runNotifyComplete == true)
{
runNotifyComplete = false;
NotifyComplete();
}
}
finally
{
if (runNotifyComplete == true)
{
runNotifyComplete = false;
NotifyComplete();
}
}
}));
}
if (runNotifyComplete == true)
{
runNotifyComplete = false;
NotifyComplete();
}
}
catch
{
// error handling.
if (runNotifyComplete == true)
{
runNotifyComplete = false;
NotifyComplete();
}
}
finally
{
}
},
request);
}
catch
{
if (runNotifyComplete == true)
{
runNotifyComplete = false;
NotifyComplete();
}
}
finally
{
}
编辑1：这是初始化后台任务的代码 MessageBox.Show（MyResources.LiveTileToggleMsgBoxText，“Live tile”，MessageBoxButton.OK）;
//start background agent
PeriodicTask periodicTask = new PeriodicTask("AppPeriodicAgent0440");
periodicTask.Description = "Periodic task for APP that updates the LiveTile .";
periodicTask.ExpirationTime = System.DateTime.Now.AddDays(14);
// If the agent is already registered with the system,
if (ScheduledActionService.Find(periodicTask.Name) != null)
{
ScheduledActionService.Remove("AppPeriodicAgent0440");
}
try
{
//only can be called when application is running in foreground
ScheduledActionService.Add(periodicTask);
}
catch
{
}
编辑2： 每次退出应用程序时都会运行此代码，以使后台任务保持活动状态。我把它放在OnNavigatedFrom中以避免减慢应用程序的启动速度
//start background agent
PeriodicTask periodicTask = new PeriodicTask("AppPeriodicAgent0440");
periodicTask.Description = "Periodic task for APP that updates the LiveTile.";
periodicTask.ExpirationTime = System.DateTime.Now.AddDays(14);
// If the agent is already registered with the system,
if (ScheduledActionService.Find(periodicTask.Name) != null)
{
ScheduledActionService.Remove("AppPeriodicAgent0440");
}
//only can be called when application is running in foreground
ScheduledActionService.Add(periodicTask);
答案 0 :(得分：1)
如果您阅读后台代理概述 http://msdn.microsoft.com/en-us/library/hh202942(v=vs.92).aspx您会看到它会详细说明您不会遵循计划的几种情况。例如：
省电模式是用户可以在设备上启用的选项 表明电池寿命应优先考虑。如果是这种模式 启用后，即使间隔已过，也可能无法运行定期代理
答案 1 :(得分：0)
无法保证计划任务将按预期计划运行。它甚至在执行时间表中有+/- 10分钟的条款。
根据您的问题，没有关于您在预计计划运行时如何记录设备上可能发生的其他事件/任务的信息。
由于您没有记录错误，超时或检查任务的LastExitReason，因此您可能会遇到各种原因。
如果我不得不猜测问题所在，根据您提供的信息，我认为问题出在Web请求（网络或服务器）上，请求中的错误会导致UI没有更新。
无法保证磁贴将按预测的时间表更新。如果您必须根据您的情况/要求完全更新，那么此平台将无法提供该保证。
如果您需要保持多个图块同步，我可以通过同一过程更新所有图块来实现此目的。
这样，即使从时间角度更新磁贴时出现不一致，它们也会彼此同步。