Question

此应用程序需要使用dispatcherTimer和TimePicker播放音频/视频/ ssml（xml）文件，以选择何时使用MediaElement控件播放文件。使用FilePicker，MediaElement可以很好地播放位于项目的Assets目录内的文件。但是当我在项目目录之外选择文件时，像“ C：\ Users \ Flazz \ Music \ AV \ PlayLibray \ Audio \ Filename1.mp3”一样，它不会执行任何操作。我尝试了添加链接文件，但是vs2017中不存在该选项。据说VisualStudios团队知道他们需要调查此疏忽。不过，必须有一个简单的解决方案。也许我的路径是错误的，所以代码如下：

  public UC_Mood()
    {
        this.InitializeComponent();

        PickAFileButton.Click += new RoutedEventHandler(PickAFileButton_Click);
        PickAFileButton2.Click += new RoutedEventHandler(PickAFileButton2_Click);
        PickAFileButton3.Click += new RoutedEventHandler(PickAFileButton3_Click);
        PickAFileButton4.Click += new RoutedEventHandler(PickAFileButton4_Click);
    }
    const string ENV_PROJ_PATH = "ms-appx:///Assets/AV/PlayLibray/Audio/";
    const string ENV_CENTRAL_PATH = @"C:\Users\Flazz\Music\AV\PlayLibray\Audio\";

带有FileOpenPicker代码的点击事件处理程序：

private async void PickAFileButton_Click(object sender, RoutedEventArgs e)
    {
        // Clear previous returned file name, if it exists, between iterations of this scenario
        tbFilePicked.Text = "";

        FileOpenPicker openPicker = new FileOpenPicker();
        openPicker.ViewMode = PickerViewMode.Thumbnail;
        openPicker.SuggestedStartLocation = PickerLocationId.MusicLibrary;
        openPicker.FileTypeFilter.Add(".mp3");
        openPicker.FileTypeFilter.Add(".m4a");     
        openPicker.FileTypeFilter.Add(".m4v");
        openPicker.FileTypeFilter.Add(".avi");
        openPicker.FileTypeFilter.Add(".wav");
        openPicker.FileTypeFilter.Add(".wmv");
        openPicker.FileTypeFilter.Add(".mp4");
        openPicker.FileTypeFilter.Add(".xml");

        StorageFile file = await openPicker.PickSingleFileAsync();
        if (file != null)
        {
            // Application now has read/write access to the picked file
            tbFilePicked.Text = file.Name;
            Debug.WriteLine(ENV_CENTRAL_PATH + tbFilePicked.Text);
        }
        else
        {
            tbFilePicked.Text = "Operation cancelled.";
        }
    }

带有MediaElement的Timer_Tick，其中项目路径之外的任何文件路径均不播放：
* note-在const string ENV_CENTRAL_PATH = @"C:\Users\Flazz\Music\AV\PlayLibray\Audio\";

上方声明的路径

 private void timer_Tick(object sender, object e)
    {
        CountDown--;
        txtCountDown.Text = CountDown.ToString();
        if ((CountDown <= 0))
        {
            CountDown = 0;
            try
            {
                 MediaTool.Source = new Uri(ENV_CENTRAL_PATH + tbFilePicked.Text);
               // MediaTool.Source = new Uri(ENV_PROJ_PATH + tbFilePicked.Text);
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex.Message.ToString());
            }
            MediaTool.Volume = 100;
            MediaTool.Play();
            timer.Stop();
        }
    }

感谢进阶！亚当

MediaElement不会播放项目目录之外的文件

0 个答案: