获取音乐库文件

Question

试图在windows phone应用程序8.1上超出音乐文件夹，但出现以下异常：

System.Reflection.TargetInvocationException未经处理消息：System.Windows.ni.dll中发生类型为"System.Reflection.TargetInvocationException"的未经处理的异常。其他信息：调用的目标引发了异常。

这是代码：调用

try
{
    GetFiles();
}
catch (Exception ex)
{
    Debug.WriteLine(ex.Message);
}
private async void GetFiles()
{
    StorageFolder folder = KnownFolders.MusicLibrary;
    IReadOnlyList<StorageFile> listOfFiles;
    if (folder!=null)
    {
        listOfFiles =await folder.GetFilesAsync(); //this line casuing Debugger.break();
    }
}

Answer 1

在package.appmanifest文件中添加音乐库功能

然后试试这个代码。它对我有效

    StorageFolder folder = KnownFolders.MusicLibrary;
    if (folder!=null)
    {
       var songs = (await   folder.GetFilesAsync(Windows.Storage.Search.CommonFileQuery.OrderByName)).ToList();
    }

链接到示例代码

Answer 2

试试这个。

适用于Windows 8.1 Universal

            FileOpenPicker openPicker = new FileOpenPicker();
            openPicker.ViewMode = PickerViewMode.Thumbnail;
            openPicker.SuggestedStartLocation = PickerLocationId.MusicLibrary;
            openPicker.FileTypeFilter.Add(".mp3");
            openPicker.FileTypeFilter.Add(".wav");
            openPicker.FileTypeFilter.Add(".mp4");
            var file = await openPicker.PickSingleFileAsync();
            try
            {
                var stream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read);
                playbackElement3.SetSource(stream, file.ContentType);//Play Selected
                playbackElement3.Play();
            }
            catch (Exception ex)
            {
            }

然后尝试从源获取列表