用MediaPlayer播放MP3没声音

[weixin_38055863]

自己写了一段很短的测试代码，但是播放没声音，代码如下
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;


namespace AudioPlayTest
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
MediaPlayer player = new MediaPlayer();

player.Open(new Uri("D:\\KuGou\\张信哲 - 爱你没错.mp3", UriKind.RelativeOrAbsolute));
player.Volume = 1;

player.Play();
}
}
}

是我用法有问题？求解