C#-窗体之音乐播放器

List<string> listSongs = new List<string>();

private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog odf = new OpenFileDialog();
            odf.Title = "选择音乐文件夹";
            odf.InitialDirectory = @"C:\Users\H0772690\Music";
            odf.Multiselect = true;//多选
            odf.Filter = "音乐文件|*.wav|所有文件|*.*";
            odf.ShowDialog();
            //获得我们在文件夹中选择的所有文件的全路径
            string[] path = odf.FileNames;
            for (int i = 0; i < path.Length; i++)
            {
                listBox1.Items.Add(path[i]);
                //将音乐文件的全路径存储到泛型集合中
                listSongs.Add(path[i]);
            }
        }

 /// <summary>
        /// 实现双击播放
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
         SoundPlayer sp = new SoundPlayer();
        private void listBox1_DoubleClick(object sender, EventArgs e)
        {
            
            sp.SoundLocation = listSongs[listBox1.SelectedIndex];
            sp.Play();
        }

private void button4_Click(object sender, EventArgs e)
        {
            this.Close();
        }

private void button2_Click(object sender, EventArgs e)
        {
            int index = listBox1.SelectedIndex;
            if (index == 0)
            {
                index = listBox1.Items.Count;
            }
            index--;
            //将改变后的索引从新赋值给我选中项的索引
            listBox1.SelectedIndex = index;
            sp.SoundLocation = listSongs[index];
            sp.Play();
        }

private void button3_Click(object sender, EventArgs e)
        {
            int index = listBox1.SelectedIndex;
            index++;
            if (index == listBox1.Items.Count)
            {
                index = 0;
            }
            //将改变后的索引从新赋值给我选中项的索引
            listBox1.SelectedIndex = index;
            sp.SoundLocation = listSongs[index];
            sp.Play();
        }