如何将文本框中的文本添加到列表中

Question

我创建了一个空列表，当用户输入新曲目时将使用该列表，并且我的界面有列表框和 texbox 以及添加和删除按钮。

我的目标是当我将新项目添加到列表框时，相同的按钮使用该功能将该项目添加到列表中，而不是它们只是添加到列表框而不是存储它。

trackListbox.Items.Add(newTracktextBox.Text);
List<Songs> NewSongs = newTracktextBox.Text ().ToList(); ; this is not correct

有什么不同的想法吗？

class Songs
{
    private string trackName;
    private int trackLength;
    public Songs (string trackName, int trackLength)
    {
        this.trackName = trackName;
        this.trackLength = trackLength;
    }
}

Answer 1

试试这个

Songs objSong = new Songs(newTracktextBox.Text,0); // define your length instead of 0

List<Songs> NewSongs = new List<Songs>();
NewSongs.Add(objSong);

Answer 2

最好将类命名为Song 而不是Songs，因为它只代表一首歌曲。

---

手动添加歌曲到listBox

private List<Song> SongList;

public Form1()
{
    InitializeComponent();

    SongList = new List<Song>();
}

private void button1_Click(object sender, EventArgs e)    
{
    Song song = new Song(newTracktextBox.Text, 100);
    SongList.Add(song);
    listBox1.Items.Add(song); // The trackName will be shown because we are doing a override on the ToString() in the Song class
}

class Song
{
    private string trackName;
    private int trackLength;

    public Song(string trackName, int trackLength)
    {
        this.trackName = trackName;
        this.trackLength = trackLength;
    }

    public override string ToString()
    {
        return trackName;
        // Case you want to show more...
        // return trackName + ": " +  trackLength;
    }
}

---

使用BindingList<Song>自动绑定

private BindingList<Song> SongList;

public Form1()
{
    InitializeComponent();

    // Initialise a new list and bind it to the listbox
    SongList = new BindingList<Song>();
    listBox1.DataSource = SongList;
}


private void button1_Click(object sender, EventArgs e)
{
    // Create a new song and add it to the list, 
    // the listbox will automatically update accordingly
    Song song = new Song(newTracktextBox.Text, 100);
    SongList.Add(song);
}

class Song
{
    private string trackName;
    private int trackLength;

    public Song(string trackName, int trackLength)
    {
        this.trackName = trackName;
        this.trackLength = trackLength;
    }

    public override string ToString()
    {
        return trackName;
    }
}

结果

Answer 3

您的 newTracktextBox 变量不是 Song 类型的对象。

您应该使用 newTracktextBox 中的文本创建一个 Song 类型的新对象，并将新对象添加到列表中

Answer 4

public class Songs{
    String TrackName;
    int TrackLength;
    public Songs(string trackName, int trackLength){
       this.TrackName = trackName;
       this.TrackLength = trackLength;
   }
   //methods
}

制作歌曲列表

List<Songs> NewSongs = new List<Songs>();

将新歌添加到列表中

int tracklength = 50; // set the tracklength where you need
NewSongs.Add(new Songs(TextBox.Text.ToString(),tracklegnth));

请注意，ToString() 方法可能是多余的。

希望我能帮上忙