private async void Commands_LoadMedia(object sender, ExecutedRoutedEventArgs e)
        {
            Command_UnloadMedia(null, null);
            CommonOpenFileDialog fileDialog = new CommonOpenFileDialog
            {
                Title                   = "打开媒体文件",
                DefaultDirectory        = Environment.CurrentDirectory,
                IsFolderPicker          = false,
                AllowNonFileSystemItems = true,
                EnsurePathExists        = true,
                Multiselect             = false,
                //Filters = { new CommonFileDialogFilter("波形音频", ".wav") },
                EnsureFileExists = true
            };

            if (fileDialog.ShowDialog() != CommonFileDialogResult.Ok)
            {
                return;
            }
            if (!DockControl?.IsVisible ?? true)
            {
                DockControl?.Show();
            }
            MediaLoaded = true;
            Playing     = true;
            //MediaPlayer.Play(new Media(_libVLC, fileDialog.FileName));
            await VideoElement.Open(new Uri(fileDialog.FileName));

            await VideoElement.Play();
        }