C# 方法中无法识别名称

在下面的示例中，我试图通过一个方法访问我的列表，但是列表的名称无法识别，为什么

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();

        List<DutyDay> tour = new List<DutyDay>();
        tour.Add(new DutyDay() { Day = "Day 1:" });
        tour.Add(new DutyDay() { Day = "Day 2:" });
        tour.Add(new DutyDay() { Day = "Day 3:" });
        tour.Add(new DutyDay() { Day = "Day 4:" });
        tour.Add(new DutyDay() { Day = "Day 5:" });
        tour.Add(new DutyDay() { Day = "Day 6:" });

        listBoxDutyDays.ItemsSource = tour;
    }

    private void DatePicker_CalendarClosed(object sender, RoutedEventArgs e)
    {
        foreach (DutyDay item in tour)  <-- "tour" is not recognized?!
        {

        }
    }
}

我已经试着公开这个列表，或者把它放在其他括号中，但是译员对此并不满意

很抱歉这个愚蠢的问题，但我还是新的…

您需要使Tour成为实例成员而不是局部变量，因为它在其他方法中没有作用域

public partial class MainWindow : Window
{
    private List<DutyDay> tour = new List<DutyDay>();

    ...

进一步阅读

---

列表变量是在Window的构造函数中声明的，这意味着它只能在该构造函数中访问

因此，将这个变量作为全局变量，这样就可以在整个类中访问它

像

---

您可以阅读有关局部变量和全局变量的更多信息

您只需在全局范围内声明它即可访问它

试试这个

public partial class MainWindow : Window
{
    List<DutyDay> tour = new List<DutyDay>(); // it is declared as global
    public MainWindow()
    {
        InitializeComponent();

        //List<DutyDay> tour = new List<DutyDay>(); It Is declared as local
        tour.Add(new DutyDay() { Day = "Day 1:" });
        tour.Add(new DutyDay() { Day = "Day 2:" });
        tour.Add(new DutyDay() { Day = "Day 3:" });
        tour.Add(new DutyDay() { Day = "Day 4:" });
        tour.Add(new DutyDay() { Day = "Day 5:" });
        tour.Add(new DutyDay() { Day = "Day 6:" });

        listBoxDutyDays.ItemsSource = tour;
    }

    private void DatePicker_CalendarClosed(object sender, RoutedEventArgs e)
    {
        foreach (DutyDay item in tour)  <-- "tour" is not recognized?!
        {

        }
    }
}

---

完美的感谢您的快速回答：-谢谢，VisualStyleElement。窗口甚至没有必要，只是将声明放在更高的位置就成功了。

public partial class MainWindow : Window
{
    List<DutyDay> tour = new List<DutyDay>(); // it is declared as global
    public MainWindow()
    {
        InitializeComponent();

        //List<DutyDay> tour = new List<DutyDay>(); It Is declared as local
        tour.Add(new DutyDay() { Day = "Day 1:" });
        tour.Add(new DutyDay() { Day = "Day 2:" });
        tour.Add(new DutyDay() { Day = "Day 3:" });
        tour.Add(new DutyDay() { Day = "Day 4:" });
        tour.Add(new DutyDay() { Day = "Day 5:" });
        tour.Add(new DutyDay() { Day = "Day 6:" });

        listBoxDutyDays.ItemsSource = tour;
    }

    private void DatePicker_CalendarClosed(object sender, RoutedEventArgs e)
    {
        foreach (DutyDay item in tour)  <-- "tour" is not recognized?!
        {

        }
    }
}