C#win8开发的程序集文件处理

System.IO.DirectoryInfo TheFolder = new System.IO.DirectoryInfo("ms-appx:///MusicFolder"); //构建DirectortInfo对象
foreach (FileInfo NextFile in TheFolder.GetFiles())  //遍历文件
{
//lstFolderName.Add(new myFolderName() { FolderName = NextFile.Name });
lstMusic.Items.Add(NextFile.Name);
}

DirectoryInfo 方法一直出错，不存在该方法。                    

http://blog.csdn.net/zhibudefeng/article/details/8239210