UWP ExtendedExecution - 请求扩展执行时出错

Question

我有一个 UWP 应用程序，它在回调中请求扩展执行，该回调在操作开始后触发，如下所示：

private async void HandleOnSyncStart(ISyncStart msg)
{
    // request extended execution
    ExtendedExecutionResult result = await 
      Utils.ExtendedExecutionHelper.RequestExtendedExecutionSessionAsync();
}

，但出现以下错误

The group or resource is not in the correct state to perform the 
 requested operation. (Exception from HRESULT: 0x8007139F)

在 RequestExtendedExecutionSessionAsync() 方法中的 return 调用中引发错误，如下所示。这是堆栈跟踪：

   at Windows.ApplicationModel.ExtendedExecution.ExtendedExecutionSession..ctor()
   at MyProject.UWP.Utils.ExtendedExecutionHelper.<RequestExtendedExecutionSessionAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at MyProject.UWP.MainPage.<HandleOnSyncStart>d__65.MoveNext()

在 ExtendedExecutionHelper static class 的 RequestExtendedExecutionAsync() 方法中请求扩展执行会话，如下所示：

    public static async Task<ExtendedExecutionResult> RequestExtendedExecutionSessionAsync()
    {
        ClearExtendedExecutionSession();  //first clear if any session granted

        var newSession = new ExtendedExecutionSession();
        newSession.Reason = ExtendedExecutionReason.Unspecified;
        newSession.Description = "Extended Execution Request";
        newSession.Revoked += OnExtendedExecutionSessionRevoked;

        ExtendedExecutionResult result = await newSession.RequestExtensionAsync();
        switch (result)
        {
            case ExtendedExecutionResult.Allowed:
                Debug.WriteLine(string.Format("ExtendedExecutionHelper: ExtendedExecution allowed."));
                session = newSession;
                break;
            case ExtendedExecutionResult.Denied:
                Debug.WriteLine(string.Format("ExtendedExecutionHelper: ExtendedExecution denied."));
                newSession.Dispose();
                break;
        }

        return result; //ERROR
    }

Answer 1

ExtendedExecutionSession class.

的构造函数中抛出此异常

Stacktrace: at Windows.ApplicationModel.ExtendedExecution.ExtendedExecutionSession..ctor()

而这个异常可能是由

引起的

Only one ExtendedExecutionSession can be requested at any time; attempting to create another session while one is currently active will cause an exception to be thrown from the ExtendedExecutionSession constructor.

所以看起来 ClearExtendedExecutionSession 未能处理之前的运行会话。如果您的代码是从 this page 中采用的...也许代码有一些细微的错误，如该页面上的一些评论所示。

你可以展示你是如何处理上一个运行会话的。

UWP ExtendedExecution - 请求扩展执行时出错

UWP ExtendedExecution - Error when requesting Extended Execution

windows-10

uwp

xamarin.uwp