后台代理不执行。：Windows Phone 8

Question

需要解决方案

后台代理只工作一次。之后没有出现后台代理。它在第一次工作，并且在页面打开后立即工作。然而，在那之后，它需要永远和永远再次这样做。有时页面关闭和打开不起作用。这可能是因为没有删除代理

我的后台代理代码：

#define DEBUG_AGENT
using System;
using System.Windows;
using Microsoft.Phone.Scheduler;
using Microsoft.Phone.Shell;
using Microsoft.Phone.Info;
using System.Linq;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using System.Threading;
using Microsoft.Xna.Framework.Media;
using System.Windows.Input;
using Microsoft.Devices;
using System.IO;
using System.IO.IsolatedStorage;
using System.Windows.Media.Imaging;
using System.Net.Sockets;
using System.Text;
using System.Net;

namespace ScheduledTaskAgent1
{
    public class ScheduledAgent : ScheduledTaskAgent
    {

        private static volatile bool _classInitialized;
        //private DispatcherTimer s;
        Socket _socket = null;
        ManualResetEvent _clientDone = new ManualResetEvent(false);
        const int TIMEOUT_MILLISECONDS = 5000;
        const int MAX_BUFFER_SIZE = 2048;
        double lat = 7.16126666666667;

        static ScheduledAgent()
        {
            // Subscribe to the managed exception handler
            Deployment.Current.Dispatcher.BeginInvoke(delegate
            {
                Application.Current.UnhandledException += UnhandledException;
            });
        }

        /// Code to execute on Unhandled Exceptions
        private static void UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
        {
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // An unhandled exception has occurred; break into the debugger
                System.Diagnostics.Debugger.Break();
            }
        }

        protected override void OnInvoke(ScheduledTask task)
        {
            //TODO: Add code to perform your task in background
            string toastTitle = "";

            _socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

            lat += 0.001;
            string snmea = DD2NMEA(lat, 80.44506);

            string dates = DateTime.UtcNow.ToString("ddMMyy");

            string UTCTime = DateTime.UtcNow.ToString("hhmmss") + ".000";

            string s1 = Checksum("$FRCMD,869444005499999,_SendMessage,,0809.67600,N,8050.70360,E,1.0,1.08,3.0,141013,055642.000,1,Button1=1,Button2=0,Switch1=1,Switch2=0,Analog1=4.00,Analog2=5.00,SosButton=0,BatteryLow=0,Text1=Text1,Text2=Text2*00");

            string s = Send("$FRCMD,869444005499999,_SendMessage,," + snmea + ",1.0,1.08,3.0," + dates + "," + UTCTime + ",1,Button1=1,Button2=0,Switch1=1,Switch2=0,Analog1=4.00,Analog2=5.00,SosButton=0,BatteryLow=0,Text1=Text1,Text2=Text2*00");


                 startToastTask(task, toastTitle);

        }

        private void startToastTask(ScheduledTask task, string toastTitle)
        {              

#if DEBUG_AGENT
            ScheduledActionService.LaunchForTest(task.Name, TimeSpan.FromSeconds(10));
#endif

            // Call NotifyComplete to let the system know the agent is done working.
            NotifyComplete();
        }
 }
}

调用代理的应用中的我的页面

PeriodicTask toastPeriodicTask;

 const string toastTaskName = "ToastPeriodicAgent";



 protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
        {
            toastPeriodicTask = ScheduledActionService.Find(toastTaskName) as PeriodicTask;

 StartPeriodicAgent(toastTaskName);
}

 private void StartPeriodicAgent(string taskName)
        {
            toastPeriodicTask = ScheduledActionService.Find(taskName) as PeriodicTask;

            if (toastPeriodicTask != null)
            {
                RemoveAgent(taskName);
            }
            toastPeriodicTask = new PeriodicTask(taskName);

            toastPeriodicTask.Description = periodicTaskDesc;

            try
            {
                ScheduledActionService.Add(toastPeriodicTask);

#if(DEBUG_AGENT)
                ScheduledActionService.LaunchForTest(taskName, TimeSpan.FromSeconds(2));
#endif
            }
            catch (InvalidOperationException exception)
            {
                if (exception.Message.Contains("BNS Error: The action is disabled"))
                {
                    MessageBox.Show("Background agents for this application have been disabled by the user.");
                }
                else if (exception.Message.Contains("BNS Error: The maximum number of ScheduledActions of this type have already been added."))
                {
                    MessageBox.Show("BNS Error: The maximum number of ScheduledActions of this type have already been added.");
                }
                else
                {
                    MessageBox.Show("An InvalidOperationException occurred.");
                }
            }
            catch (SchedulerServiceException)
            {

            }
        }

Answer 1

确保您的项目已定义 DEBUG_AGENT。这是您的项目属性中的设置。要设置此标志，请按照以下步骤操作

1. 在VS中右键项目，选择属性
2. 选择构建选项卡
3. 将 DEBUG_AGENT 添加到“条件编译符号”字段。

如果已设置，我发现最好在 LaunchForTest 中留出至少 30 秒的时间。有时，当您告诉它时，它并没有完全安排好它。