如何將文本從文本框添加到列表中

Question

我創建了一個空列表，當用戶輸入新曲目並且我的界面有列表框和一個texbox以及添加和刪除按鈕時，它將被使用。

我的目標是當我向列表框中添加一個新項目時，使用該功能將該項目添加到列表中，而不是將它們添加到列表框中而不存儲它。

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

任何不同的想法？

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

Answer 1

這是很好的做法，將類命名爲Song，而不是Songs因爲它僅代表一個歌曲。

---

隨着通過使用BindingList<Song>

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; 
    } 
} 

結果

手動添加歌曲到 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; 
    } 
} 

---

帶自動結合

Answer 2

您的newTracktextBox變量不是宋類型的對象。

您應該創建Song類型與在newTracktextBox了一個新的文本對象和新對象添加到列表中

Answer 3

試試這個

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

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

Answer 4

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

使歌曲

列表

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

將新歌曲添加到列表中

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

請注意，ToString（）方法可能會減少。

希望我幫助