private async void listViewHistory_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            //播放音乐
            ListViewItem item = listViewHistory.GetItemAt(e.X, e.Y);

            selectedSong = songs[item.Index - 1];
            string dirImgTemp = "..\\..\\temp\\img";                  // 缓存的专辑所在文件夹
            string dirLrcTemp = "..\\..\\temp\\lrc";                  // 缓存的歌词所在文件夹
            string imgFile    = selectedSong.SongName + "-" + selectedSong.SongSinger + "-" + selectedSong.SongAlbum + ".jpg";
            string lrcFile    = selectedSong.SongName + "-" + selectedSong.SongSinger + "-" + selectedSong.SongAlbum + ".txt";

            //播放音乐
            play(selectedSong);

            if (!Directory.Exists(dirImgTemp))      //如果不存在dirImgTemp就创建
            {
                Directory.CreateDirectory(dirImgTemp);
            }
            if (!Directory.Exists(dirLrcTemp))      //如果不存在dirLrcTemp就创建
            {
                Directory.CreateDirectory(dirLrcTemp);
            }
            await Task.Run(() =>
            {
                if (!File.Exists(dirImgTemp + "\\" + imgFile))  //如果不存在,则获取URL下载
                {
                    if (!(DownLoader.DownloadSongOrImg(selectedSong.ImgDownloadURL, dirImgTemp + "\\" + imgFile)))
                    {
                        //错误处理
                    }
                }
                if (!File.Exists(dirLrcTemp + "\\" + lrcFile))  //如果不存在,则获取URL下载
                {
                    if (!(DownLoader.DownloadLrc(selectedSong.LrcDownloadURL, dirLrcTemp + "\\" + lrcFile)))
                    {
                        //错误处理
                    }
                }
            });

            IncreaseHistory(selectedSong);
            pictureBoxAlbum.BackgroundImage = Image.FromFile(dirImgTemp + "\\" + imgFile);
            labelSongInfo.Text = selectedSong.SongName + "- " + selectedSong.SongSinger;
            historyPaint();
        }
        private async void toolStripMenuItem2_Click(object sender, EventArgs e)
        {
            string dirSongDownload = "..\\..\\download\\music";         // 下载的音乐所在文件夹
            string dirImgDownload  = "..\\..\\download\\img";           // 下载的专辑图片所在文件夹
            string dirLrcDownload  = "..\\..\\download\\lrc";           // 下载的歌词所在文件夹
            string dirImgTemp      = "..\\..\\temp\\img";               // 缓存的专辑所在文件夹
            string dirLrcTemp      = "..\\..\\temp\\lrc";               // 缓存的歌词所在文件夹

            string songFile = selectedSong.SongName + "-" + selectedSong.SongSinger + "-" + selectedSong.SongAlbum + ".mp3";
            string imgFile  = selectedSong.SongName + "-" + selectedSong.SongSinger + "-" + selectedSong.SongAlbum + ".jpg";
            string lrcFile  = selectedSong.SongName + "-" + selectedSong.SongSinger + "-" + selectedSong.SongAlbum + ".txt";

            if (!Directory.Exists(dirSongDownload))     //如果不存在dirSongDownload就创建
            {
                Directory.CreateDirectory(dirSongDownload);
            }
            if (!Directory.Exists(dirImgDownload))      //如果不存在dirImgDownload就创建
            {
                Directory.CreateDirectory(dirImgDownload);
            }
            if (!Directory.Exists(dirLrcDownload))      //如果不存在dirLrcDownload就创建
            {
                Directory.CreateDirectory(dirLrcDownload);
            }
            await Task.Run(() =>
            {
                if (!(DownLoader.DownloadSongOrImg(selectedSong.SongDownloadURL, dirSongDownload + "\\" + songFile)))
                {
                    //错误处理
                }
                if (File.Exists(dirImgTemp + "\\" + imgFile))  //如果存在缓存,直接复制
                {
                    if (!File.Exists(dirImgDownload + "\\" + imgFile))
                    {
                        FileInfo file = new FileInfo(dirImgTemp + "\\" + imgFile);
                        file.CopyTo(dirImgDownload + "\\" + imgFile);
                    }
                }
                else    //如果不存在,则获取URL下载
                {
                    if (!(DownLoader.DownloadSongOrImg(selectedSong.ImgDownloadURL, dirImgDownload + "\\" + imgFile)))
                    {
                        //错误处理
                    }
                }
                if (File.Exists(dirLrcTemp + "\\" + lrcFile))  //如果存在缓存,直接复制
                {
                    if (!File.Exists(dirLrcDownload + "\\" + lrcFile))
                    {
                        FileInfo file = new FileInfo(dirLrcTemp + "\\" + lrcFile);
                        file.CopyTo(dirLrcDownload + "\\" + lrcFile);
                    }
                }
                else    //如果不存在,则获取URL下载
                {
                    if (!(DownLoader.DownloadLrc(selectedSong.LrcDownloadURL, dirLrcDownload + "\\" + lrcFile)))
                    {
                        //错误处理
                    }
                }
                SQLiteConnection conn = new SQLiteConnection("data source=music_player.db");
                conn.Open();
                SQLiteCommand cmd       = new SQLiteCommand($"SELECT * FROM local WHERE songID = '{songFile}'", conn);
                SQLiteDataReader reader = cmd.ExecuteReader();
                if (!reader.HasRows)
                {
                    cmd = new SQLiteCommand($"INSERT INTO local VALUES('{selectedSong.SongName}', '{selectedSong.SongSinger}', '{selectedSong.SongAlbum}', '{songFile}', '{imgFile}', '{lrcFile}',1)", conn);
                    cmd.ExecuteNonQuery();
                }
                reader.Close();
                conn.Close();
            });
        }