手电筒应用程序每次都会崩溃 [英] Flashlight app crashing everytime

问题描述

我正在尝试通过Windows Phone应用程序中的TorchControl类操作手电筒应用程序：这是我的代码

private static async Task<DeviceInformation> GetCameraID(Windows.Devices.Enumeration.Panel desiredCamera)
    {
        DeviceInformation deviceID = (await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture))
            .FirstOrDefault(x => x.EnclosureLocation != null && x.EnclosureLocation.Panel == desiredCamera);
        if (deviceID != null) return deviceID;
        else throw new Exception(string.Format("Camera {0} doesn't exist", desiredCamera));
    }


    async private void Button_Click(object sender, RoutedEventArgs e)
   {
       var cameraID = await GetCameraID(Windows.Devices.Enumeration.Panel.Back);
       var mediaDev = new MediaCapture();
       await mediaDev.InitializeAsync(new MediaCaptureInitializationSettings
       {
           StreamingCaptureMode = StreamingCaptureMode.Video,
           PhotoCaptureSource = PhotoCaptureSource.VideoPreview,
           AudioDeviceId = String.Empty,
           VideoDeviceId = cameraID.Id
       });
       var videoDev = mediaDev.VideoDeviceController;
       var tc = videoDev.TorchControl;
       if (tc.Supported)         
           tc.Enabled = true;
       mediaDev.Dispose();          
   }

但问题是每当我第二次点击按钮时应用程序崩溃。我被告知使用mediaDev.Dispose（）方法，但它也无法正常工作。

But the problem is that the app crashes everytime i click on the button second time. I have been told to use the mediaDev.Dispose() method but it is also not working.

这是例外："第一次机会异常mscorlib.ni.dll WinRT信息中出现'System.Exception'类型：找不到与此错误代码关联的文本。" - 这是在"initializeasync"中的文本中显示的。
突出显示

Here's the exception: "A first chance exception of type 'System.Exception' occurred in mscorlib.ni.dll WinRT information: The text associated with this error code could not be found." - This is showing while the text in "initializeasync" is highlighted

请帮助。谢谢

Please help. Thanks

Prajjwal Dimri

Prajjwal Dimri

推荐答案

也许使用块会有帮助。

Maybe a using block will help.

使用（var = new
MediaCapture （））

{

等等

}

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