c# – 我不能从另一个类调用公共方法

public partial class NewGame : Form
{
  public NewGame()
  {
    InitializeComponent();
    this.Icon = new Icon("Resources/iconG.ico");
    comboBoxGenre.Items.AddRange(Enum.GetNames(typeof(Game.Genre)));
  }

  public string GetGameName()
  {
    return txtbxGameName.Text.Trim();
  }

  public int GetGenreSelector()
  {
    return comboBoxGenre.SelectedIndex;
  }
}

这是我的主要形式

private void addGameToolStripMenuItem_Click(object sender,EventArgs e)
{
  Form newGame = new NewGame();
  newGame.ShowDialog(this);
  if (newGame.DialogResult==DialogResult.OK)
  {
    string gameName = newGame.GetGameName(); //this part doesn't work
  }
}

我收到一条错误消息：

Error 1
‘System.Windows.Forms.Form’ does not contain a definition for
‘GetGameName’ and no extension method ‘GetGameName’ accepting a first
argument of type ‘System.Windows.Forms.Form’ could be found (are you
missing a using directive or an assembly
reference?)

几个星期前我写了类似的代码,它完美无缺.