c#音乐播放器

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Media;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace 音乐播放器
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

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

        private void button1_Click(object sender, EventArgs e)
        {
            //打开一个对话框，提示用户选择文件
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Title = ("请选择音乐文件");       //文本框标题
            ofd.InitialDirectory = @"D:FFOutput";    //默认打开的文件夹
            ofd.Multiselect = true;             //允许对话框选择多个文件
            ofd.Filter = "音乐文件|*.wav|所有文件|*.*";         //可选的文件类型
            ofd.ShowDialog();       //显示对话框

            //将所有选中的文件添加到listbox中
            string[] path = ofd.FileNames;          //获取被选择文件的全路径
            for (int i = 0; i < path.Length; i++)
            {
                listBox1.Items.Add(Path.GetFileName(path[i]));      //将音乐文件添加到ListBox中
                Music.Add(path[i]);         //将音乐文件的全路径添加到List集合中
            }

        }
        SoundPlayer sp = new SoundPlayer();     //播放对象
        //双击歌曲播放
        private void listBox1_DoubleClick(object sender, EventArgs e)
        {
            
            sp.SoundLocation = Music[listBox1.SelectedIndex];       //ListBox1中选中的文件的索引
            
            sp.Play();
        }

        //下一曲
        private void button3_Click(object sender, EventArgs e)
        {

            int index = listBox1.SelectedIndex;     //获取当前选中歌曲的索引
            //if(index != listBox1.Items.Count-1)
            //{
            //    index++;                                //下一曲时索引自增
            //} 
            //else if(index==listBox1.Items.Count-1)         //当前选中歌曲索引为最后一首歌时，重新回到第一曲
            //{
            //    index = 0;
            //}
            index++;
            if(index == listBox1.Items.Count)
            {
                index = 0;
            }
            sp.SoundLocation = Music[index];
            listBox1.SelectedIndex = index;
            sp.Play();
        }

        //上一曲
        private void button2_Click(object sender, EventArgs e)
        {
            int index = listBox1.SelectedIndex;     //获取当前选中歌曲的索引
            //if(index != 0)
            //{
            //    index--;                                //上一曲时索引自增
            //}  
            //else if (index == 0)         //当前选中歌曲索引为最后一首歌时，重新回到第一曲
            //{
            //    index = listBox1.Items.Count-1;
            //}
            
            if (index == 0)
            {
                index = listBox1.Items.Count-1;
            }
            else
            {
                index--;
            }
            sp.SoundLocation = Music[index];
            listBox1.SelectedIndex = index;
            sp.Play();
        }

        private void button4_Click(object sender, EventArgs e)
        {
            //Thread.Sleep();
        }
    }
}