如何知道音频是否已经播放完c#？

using System;
using System.Windows.Forms;

namespace AudioPlayer
{
    public partial class MainForm : Form
    {
        private MediaPlayer mediaPlayer;

        public MainForm()
        {
            InitializeComponent();
        }

        private void PlayButton_Click(object sender, EventArgs e)
        {
            mediaPlayer = new MediaPlayer();
            mediaPlayer.MediaEnded += MediaPlayer_MediaEnded;
            mediaPlayer.Open(new Uri("audio_file_path.mp3")); // 替换为实际的音频文件路径
            mediaPlayer.Play();
        }

        private void MediaPlayer_MediaEnded(object sender, EventArgs e)
        {
            // 音频播放完毕
            MessageBox.Show("音频已经播放完毕。");
        }
    }
}