ScheduledTaskAgent 不适用于更新 Windows Phone 中的磁贴

Question

我正在开发一个 Windows Phone 7 应用程序，并尝试在其中实现 Windows Phone 8 的功能，例如宽磁贴。我使用反射实现了它，但是当我想使用 ScheduledAgent 为周期性任务更新磁贴时，磁贴没有被创建。

调度代理 OnInvoke 代码如下所示

protected override void OnInvoke(ScheduledTask task)
{
    //TODO: Add code to perform your task in background
     if (task is PeriodicTask)
     {
         //Update the tile using Scheduled Task
         CreateTileForWindowsPhone.CreateWideTile();
     }
     NotifyComplete();
} 

我使用此代码创建了磁贴

public class CreateTileForWindowsPhone
{
    private static Version TargetedVersion = new Version(7, 10, 8858);
    public static bool IsTargetedVersion { get { return Environment.OSVersion.Version >= TargetedVersion; } }

    public static void CreateWideTile()
    {
        if (IsTargetedVersion)
        {
            try
            {
                // Get the new FlipTileData type.
                Type flipTileDataType = Type.GetType("Microsoft.Phone.Shell.FlipTileData, Microsoft.Phone");
                // Get the ShellTile type so we can call the new version of "Update" that takes the new Tile templates.

                Type shellTileType = Type.GetType("Microsoft.Phone.Shell.ShellTile, Microsoft.Phone");
                // Loop through any existing Tiles that are pinned to Start.

                QuotesCollection aq = new QuotesCollection();
                Random rand = new Random();
                int randNum = rand.Next(0, 163);

                //String wideBackStr = "Dont be the same, Be Better.";
                String wideBackStr = aq.quotes[randNum];

                foreach (var tileToUpdate in ShellTile.ActiveTiles)
                {
                    // Get the constructor for the new FlipTileData class and assign it to our variable to hold the Tile properties.
                    var UpdateTileData = flipTileDataType.GetConstructor(new Type[] { }).Invoke(null);

                    // Set the properties. 
                    SetProperty(UpdateTileData, "WideBackgroundImage", new Uri("/images/QuottedWideTile.png", UriKind.Relative));
                    SetProperty(UpdateTileData, "WideBackContent", wideBackStr);
                    // Invoke the new version of ShellTile.Update.
                    shellTileType.GetMethod("Update").Invoke(tileToUpdate, new Object[] { UpdateTileData });
                    break;
                }
            }
            catch
            {
                MessageBox.Show("Tile Error Caught");
            }
        }
    }

    private static void SetProperty(object instance, string name, object value)
    {
        var setMethod = instance.GetType().GetProperty(name).GetSetMethod();
        setMethod.Invoke(instance, new object[] { value });
    }
}

我做了一个注册代理方法来注册周期性任务

    private void RegisterAgent()
    {
        string taskName = "MyTask";
        try
        {

            if (ScheduledActionService.Find(taskName) != null)
            {
                //if the agent exists, remove and then add it to ensure
                //the agent's schedule is updated to avoid expiration
                ScheduledActionService.Remove(taskName);
            }

            PeriodicTask periodicTask = new PeriodicTask(taskName);
            periodicTask.Description = "Random Quote Update On Tile";
            ScheduledActionService.Add(periodicTask);

        }
        catch (InvalidOperationException exception)
        {
            MessageBox.Show(exception.Message);
        }
        catch (SchedulerServiceException schedulerException)
        {
            MessageBox.Show(schedulerException.Message);
        }
    }

并在应用启动时调用寄存器

    private void Application_Launching(object sender, LaunchingEventArgs e)
    {
        RegisterAgent();
    }

但是当我运行应用程序时，没有创建宽磁贴。 在我使用计划代理更新磁贴之前，宽磁贴创建曾经可以工作。我过去只是通过在应用程序启动时调用该函数来创建一个宽磁贴。

    private void Application_Launching(object sender, LaunchingEventArgs e)
    {
        CreateTileForWindowsPhone.CreateWideTile();
    }

为什么没有创建磁贴。我是不是做错了什么？

Answer 1

Deployment.Current.Dispatcher.BeginInvoke(
    CreateTileForWindowsPhone.CreateWideTile);