音乐播放器

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

namespace musicPlayer
{
    public partial class Form1 : Form
    {

        //声明一个list存储文件路径
        List<string> urlList = new List<string>();
        double max, min;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void tableLayoutPanel1_Paint(object sender, PaintEventArgs e)
        {

        }

        private void trackBar1_Scroll(object sender, EventArgs e)
        {

        }
        //添加歌曲
        private void music_put_Click(object sender, EventArgs e)
        {
            //实例化一个打开文件的对话框
            OpenFileDialog of = new OpenFileDialog();
            //让选择器可以同时选择多个文件
            of.Multiselect = true;
            of.Title = "请选择音乐文件";
            //指定文件类型
            of.Filter = "(*.mp3)|*.mp3";

            //of.ShowDialog();//弹出文件对话框的

            if(of.ShowDialog()==DialogResult.OK)
            {
                //读取文件 存储到数组
                string[] nameList = of.FileNames;
                //读取数组中的数据
                foreach(string url in nameList)
                {
                    //Path.GetFileNameWithoutExtension(url);
                    listBoxMusics.Items.Add(Path.GetFileNameWithoutExtension(url));
                    //获取歌曲路径，存在List数组中
                    urlList.Add(url);
                }
            }
        }
        //播放音乐
        private void play_Click(object sender, EventArgs e)
        {
            //看之前有没有选中，有——从选中播出，没有——从0开始播出
            int selectedIndex = listBoxMusics.SelectedIndex;

            //这是为了暂停键做的判断 测试结果：没选时selectedIndex=-1
            if (selectedIndex < 0)
            {
                selectedIndex = selectedIndex < 0 ? 0 : selectedIndex;

                //更新选中行 重新设置当前选择行的索引
                listBoxMusics.SelectedIndex = selectedIndex;
                //把获取的索引赋值给播放器控件
                axWindowsMediaPlayer1.URL = urlList[selectedIndex];
                //移动选中栏到相应位置
                musicPlayername.Text = listBoxMusics.SelectedItem.ToString();
            }
            else
            {
                axWindowsMediaPlayer1.Ctlcontrols.play();
            }
            timer1.Enabled = true;
        }
        //歌曲暂停
        private void pause_Click(object sender, EventArgs e)
        {
            axWindowsMediaPlayer1.Ctlcontrols.pause();
        }
        //停止播放
        private void stop_Click(object sender, EventArgs e)
        {
            axWindowsMediaPlayer1.Ctlcontrols.stop();
            timer1.Enabled = false;//停止记录，不然跳到下一首歌
        }
        //上一曲
        private void last_Click(object sender, EventArgs e)
        {
            //上一曲就是当前歌曲的索引减一   
            int selectedIndex = listBoxMusics.SelectedIndex-1;

            //假设有三首歌，总数为3 索引为0 1 2
            //不循环，一直停在第一首
            //selectedIndex = selectedIndex < 0 ? 0 : selectedIndex;

            //循环
            selectedIndex = selectedIndex < 0 ? listBoxMusics.Items.Count-1: selectedIndex;


            //更新选中行 重新设置当前选择行的索引
            listBoxMusics.SelectedIndex = selectedIndex;
            //把获取的索引赋值给播放器控件
            axWindowsMediaPlayer1.URL = urlList[selectedIndex];
            //移动选中栏到相应位置
            musicPlayername.Text = listBoxMusics.SelectedItem.ToString();
        }
        //下一曲
        private void next_Click(object sender, EventArgs e)
        {          //下一曲就是当前歌曲的索引加一   
            int selectedIndex = listBoxMusics.SelectedIndex +1;

            //假设有三首歌，总数为3 索引为0 1 2

            //不循环，一直停在最后一首
            //selectedIndex = selectedIndex <listBoxMusics.Items.Count?selectedIndex:listBoxMusics.Items.Count-1;

            //循环
            selectedIndex = selectedIndex < listBoxMusics.Items.Count ? selectedIndex :0;

            //更新选中行 重新设置当前选择行的索引
            listBoxMusics.SelectedIndex = selectedIndex;
            //把获取的索引赋值给播放器控件
            axWindowsMediaPlayer1.URL = urlList[selectedIndex];
            //移动选中栏到相应位置
            musicPlayername.Text = listBoxMusics.SelectedItem.ToString();
        }
        //列表发生变化选择播放的歌曲
        private void listBoxMusics_SelectedIndexChanged(object sender, EventArgs e)
        {
            //获取当前选中歌曲索引
            int selectedIndex = listBoxMusics.SelectedIndex;
            //把获取的索引赋值给播放器控件
            axWindowsMediaPlayer1.URL = urlList[selectedIndex];
        }

        private void axWindowsMediaPlayer1_Enter(object sender, EventArgs e)
        {

        }

        private void musicPlayername_Click(object sender, EventArgs e)
        {

        }

        //鼠标按下
        private void trackBar1_MouseDown(object sender, MouseEventArgs e)
        {
            //鼠标按下时，获取播放时的位置
            timer1.Enabled = false;
            axWindowsMediaPlayer1.Ctlcontrols.pause();

        }

        //鼠标抬起
        private void trackBar1_MouseUp(object sender, MouseEventArgs e)
        {
            //获取被拖动以后的位置
            double doValue = trackBar1.Value;
            //重置播放位置
            axWindowsMediaPlayer1.Ctlcontrols.currentPosition = doValue;
            axWindowsMediaPlayer1.Ctlcontrols.play();
            timer1.Enabled = true;
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            //获取文件长度 时间长度
            max = axWindowsMediaPlayer1.currentMedia.duration;
            //获取当前歌曲播放位置
            min = axWindowsMediaPlayer1.Ctlcontrols.currentPosition;

            //类型强转
            trackBar1.Maximum = (int)(max);
            trackBar1.Value = (int)(min);

            //一首歌播放完，播放下一首
            if(axWindowsMediaPlayer1.playState==WMPPlayState.wmppsStopped)
            {
                int selectedIndex = listBoxMusics.SelectedIndex + 1;
                //不循环
                //selectedIndex = selectedIndex < listBoxMusics.Items.Count ? selectedIndex : listBoxMusics.Items.Count - 1;

                //循环
                selectedIndex = selectedIndex < listBoxMusics.Items.Count ? selectedIndex : 0;

                axWindowsMediaPlayer1.URL = urlList[selectedIndex];
                listBoxMusics.SelectedIndex = selectedIndex;//选中
                musicPlayername.Text = listBoxMusics.SelectedItem.ToString();
                trackBar1.Value = 0;
                timer1.Enabled = true;
            }
        }
    }
}

自看随笔，直接赋值用不了。

环境：vs2019 

C# winfrom