c# - 应用程序在调试时不会崩溃，但在正常运行时会崩溃

Question

System Information

• Windows 10 Technical Preview (build 9926)
• Visual Studio Community 2013
  
  Attempting to debug on:
• [AT&T] Lumia 635 (Windows 10 Technical Preview for phones build 9941 w/ Lumia Cyan)
• [AT&T] Lumia 1520 (Windows Phone 8.1 with Lumia Denim and PfD)
• [Unlocked] BLU Win Jr (Windows Phone 8.1 with PfD)
• [Verizon] Lumia Icon (Windows Phone 8.1 with Lumia Denim and PfD)

---

我试图让定位服务在我的应用程序中运行。以前，我让 Visual Studio 抛出错误。这是一个 ArgumentException，消息为“Use of undefined keyword value 1 for event TaskScheduled in async”。谷歌搜索没有找到任何解决方案。

代码如下:

Geolocator Locator = new Geolocator();
Geoposition Position = await Locator.GetGeopositionAsync();
Geocoordinate Coordinate = Position.Coordinate;

当我可以得到要抛出的错误时，异常是在上面示例中的第 2 行或第 3 行抛出的。 我简化了原始代码以尝试修复它，但这是原始代码:

Geolocator Locator = new Geolocator();
Geocoordinate Coordinate = (await Locator.GetGeopositionAsync()).Position.Coordinate;

整个应用程序在调试时可以正常运行，但否则几乎会立即崩溃。

这是一个 Windows 8.1 Universal 项目，专注于手机项目。

提前致谢

---

编辑:根据要求，这里是完整的方法:

private static bool CheckConnection()
{
    ConnectionProfile connections = NetworkInformation.GetInternetConnectionProfile();
    bool internet = connections != null && connections.GetNetworkConnectivityLevel() == NetworkConnectivityLevel.InternetAccess;
    return internet;
}
public static async Task<double> GetTemperature(bool Force)
{
    if (CheckConnection() || Force)
    {
        Geolocator Locator = new Geolocator();
        await Task.Yield(); //Error occurs here
        Geoposition Position = await Locator.GetGeopositionAsync();
        Geocoordinate Coordinate = Position.Coordinate;
        HttpClient Client = new HttpClient();
        double Temperature;
        Uri u = new Uri(string.Format("http://api.worldweatheronline.com/free/v1/weather.ashx?q={0},{1}&format=xml&num_of_days=1&date=today&cc=yes&key={2}",
                                      Coordinate.Point.Position.Latitude,
                                      Coordinate.Point.Position.Longitude,
                                      "API KEY"),
                                      UriKind.Absolute);
        string Raw = await Client.GetStringAsync(u);
        XElement main = XElement.Parse(Raw), current_condition, temp_c;
        current_condition = main.Element("current_condition");
        temp_c = current_condition.Element("temp_C");
        Temperature = Convert.ToDouble(temp_c.Value);
        switch (Memory.TempUnit)
        {
            case 0:
                Temperature = Convertions.Temperature.CelsiusToFahrenheit(Temperature);
                break;
            case 2:
                Temperature = Convertions.Temperature.CelsiusToKelvin(Temperature);
                break;
        }
        return Temperature;
    }
    else
    {
        throw new InvalidOperationException("Cannot connect to the weather server.");
    }
}

---

编辑 2: 我有 asked for help on Twitter , 和 received a reply要求一个复制项目。我重新创建了原始应用程序的主要部分，但我无法得到错误。但是，你可能会出现错误so here's the project .

---

编辑 3:如果有帮助，这里是异常详细信息:

System.ArgumentException occurred
  _HResult=-2147024809
  _message=Use of undefined keyword value 1 for event TaskScheduled.
  HResult=-2147024809
  IsTransient=false
  Message=Use of undefined keyword value 1 for event TaskScheduled.
  Source=mscorlib
  StackTrace:
       at System.Diagnostics.Tracing.ManifestBuilder.GetKeywords(UInt64 keywords, String eventName)
  InnerException: 

Answer 1

检查了this和 this , 我相信这是 .NET async/await infrastructure for WinRT 中的错误.我无法重现它，但我鼓励您尝试以下解决方法，看看它是否适合您。

• 将来自 OnNavigatedTo 的所有异步等待调用分解为单独的 async Task 方法，例如ContinueAsync:

  async Task ContinueAsync()
  {
      Geolocator Locator = new Geolocator();
      Geoposition Position = await Locator.GetGeopositionAsync();
      Geocoordinate Coordinate = Position.Coordinate; 
  
      // ...
  
      var messageDialog = new Windows.UI.Popups.MessageDialog("Hello");
      await messageDialog.ShowAsync();
  
      // ...
  }
  

• 从 OnNavigatedTo 中删除 async 修饰符并从 OnNavigatedTo 中调用 ContinueAsync，如下所示:

  var scheduler = TaskScheduler.FromCurrentSynchronizationContext();
  Task.Factory.StartNew(
      () => ContinueAsync(), 
      CancellationToken.None, TaskCreationOptions.None, scheduler).
      Unwrap().
      ContinueWith(t => 
      {
          try
          {
              t.GetAwaiter().GetResult();
          }
          catch (Exception ex)
          {
              Debug.WriteLine(ex);
              throw; // re-throw or handle somehow
          }
      }, 
      CancellationToken.None,            
      TaskContinuationOptions.NotOnRanToCompletion, 
      scheduler);
  

如果有帮助请告诉我们:)

---

已更新，显然，该错误在 TPL 日志记录提供程序中的某处，TplEtwProvider .如果添加以下代码，您可以看到它正在创建。到目前为止，我找不到禁用此事件源的方法(直接或通过反射):

internal class MyEventListener : EventListener
{
    protected override void OnEventSourceCreated(EventSource eventSource)
    {
        base.OnEventSourceCreated(eventSource);
        if (eventSource.Name == "System.Threading.Tasks.TplEventSource")
        {
            var enabled = eventSource.IsEnabled();

            // trying to disable - unsupported command :(
            System.Diagnostics.Tracing.EventSource.SendCommand(
                eventSource, EventCommand.Disable, new System.Collections.Generic.Dictionary<string, string>());
        }
    }
}

// ...
public sealed partial class App : Application
{
    static MyEventListener listener = new MyEventListener();
}