Question

需要帮助尝试显示我添加到列表框中的值。我研究了几种添加到列表框的方法。这是我的最新尝试，但我无法弄清楚如何显示＆＃34; Netflix＆＃34;和＆＃34; Hulu＆＃34;。调试后，值在列表框内。我只是看不到文字。

在旁注上我正在研究这个以显示BASIC观察者模式。为了显示代码中的更改，我想显示订阅不同提供程序的结果。先谢谢你们！

public partial class MainWindow : Window
{
    List<string> myList = new List<string>();

    public MainWindow()
    {
        InitializeComponent();
    }

    private void subscribeToNetflixButton_Click(object sender, RoutedEventArgs e)
    {
        Netflix netflix = new Netflix("Stir Crazy");
        Observer subscriberOne = new Observer();
        netflix.AddObserver(subscriberOne);
        myList.Add("Netflix");
        listBox.Items.Add(myList.ToArray());
    }

    private void subscribeToHuluButton_Click(object sender, RoutedEventArgs e)
    {
        Hulu hulu = new Hulu("Willy Wonka and the Chocolate Factory");
        Observer subscriberTwo = new Observer();
        hulu.AddObserver(subscriberTwo);
        myList.Add("Hulu");
        listBox.Items.Add(myList.ToArray());
    }
}

Answer 1

您应该将AddRange与不属于Add的集合一起使用：

public partial class MainWindow : Window
{
    List<string> myList = new List<string>();

    public MainWindow()
    {
        InitializeComponent();
    }

    private void subscribeToNetflixButton_Click(object sender, RoutedEventArgs e)
    {
        Netflix netflix = new Netflix("Stir Crazy");
        Observer subscriberOne = new Observer();
        netflix.AddObserver(subscriberOne);
        myList.Add("Netflix");
        listBox.Items.AddRange(myList.ToArray());//This line should be changed
    }

    private void subscribeToHuluButton_Click(object sender, RoutedEventArgs e)
    {
        Hulu hulu = new Hulu("Willy Wonka and the Chocolate Factory");
        Observer subscriberTwo = new Observer();
        hulu.AddObserver(subscriberTwo);
        myList.Add("Hulu");
        listBox.Items.AddRange(myList.ToArray());//And this line
    }
}

顺便说一句：如果您使用WPF，虽然您必须添加自己的AddRange（默认情况下不可用），例如，通过在扩展方法内循环收集，如果您不在，则在外面循环。多次需要这个功能。

如何让列表框显示值C＃

1 个答案: