无法在 windows phone 8 中使用 MediaLibraryExtensions.SaveSong 下载音频

Question

我正在尝试下载音频并保存到隔离存储并保存到模拟器。

我尝试了以下代码。

WebClient m_webClient = new WebClient();
m_webClient.OpenReadAsync(fileUri);
m_webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_ImageOpenReadCompleted);
m_webClient.AllowReadStreamBuffering = true;  


private static void webClient_ImageOpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
        var isolatedfile = IsolatedStorageFile.GetUserStoreForApplication();
        using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream(_fileName, System.IO.FileMode.Create, isolatedfile))
        {
            byte[] buffer = new byte[e.Result.Length];
            while (e.Result.Read(buffer, 0, buffer.Length) > 0)
            {
                stream.Write(buffer, 0, buffer.Length);
            }
        }
        SaveFileMP3(_fileName);
}

private static void SaveFileMP3(string _fileName)
{
        MediaLibrary lib = new MediaLibrary();
        Uri songUri = new Uri(_fileName, UriKind.RelativeOrAbsolute);
        MediaLibraryExtensions.SaveSong(lib, songUri, null, SaveSongOperation.CopyToLibrary);

}

我面临的问题是，音频被保存到模拟器但没有扩展。假设文件名"test.MP3"，保存为"test"，无论原始时长如何，时长始终为0:0:00。

我也在清单文件中添加了音频功能。

下面是保存歌曲时的截图，里面有很多异常。

代码如有错误请指正。提前致谢。

Answer 1

通过添加 lib.savesong 行而不是使用 mediaLibraryExtensions 可以完美地工作。

private static void SaveFileMP3(string _fileName)
{
    MediaLibrary lib = new MediaLibrary();
    Uri songUri = new Uri(_fileName, UriKind.RelativeOrAbsolute);
    lib.SaveSong(songUri, null, SaveSongOperation.CopyToLibrary);
    //MediaLibraryExtensions.SaveSong(lib, songUri, null, SaveSongOperation.CopyToLibrary);

}

无法在 windows phone 8 中使用 MediaLibraryExtensions.SaveSong 下载音频

Unable to download audio with MediaLibraryExtensions.SaveSong in windows phone 8

c#

isolatedstorage

windows-phone-8