在现有列表框和数组中添加新项目

Question

I have this code for listbox that acts as a playlist. I would like to give the option to add a new song after the first ones are loaded via a new button. How can I do it?

 OpenFileDialog openFileDialog1 = new OpenFileDialog();
            openFileDialog1.Multiselect = true;
if (openFileDialog1.ShowDialog() ==  System.Windows.Forms.DialogResult.OK)
            {
                files = openFileDialog1.SafeFileNames; //save only the names
                paths = openFileDialog1.FileNames; // save the paths
                for (int i = 0; i < files.Length; i++)
                {
                    listBox1.Items.Add(files[i]); // add songs to listbox


                }
             }

Answer 1

If you want to use audio files after close and open the app, you have to handle the filepaths too. Create a filelist file and at Load event open it. The code below will add the files to the playlist.

        OpenFileDialog OpenFile = new OpenFileDialog();
        OpenFile.Filter = "Audio files (*.mp3)|*.mp3";
        OpenFile.Multiselect = true;

        System.IO.StreamWriter settingsFile = new System.IO.StreamWriter((Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)) + "playlist.ini");

        if (OpenFile.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            foreach (string filename in OpenFile.FileNames)
            {                 
                listBoxList.Items.Add(filename);
                settingsFile.WriteLine(filename);
            }
        }

        settingsFile.Close();