WPF数据绑定到布尔属性[重复]

Question

在 MainWindow.xaml 上

<Label Content="{Binding ActEna,Mode=OneWay}"/>
<Button Content="Toggle" Click="Button_Click"/>

在 MainWindow.xaml.cs 上

public partial class MainWindow : Window
    {
        public bool ActEna { get; set; }

        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
            ActEna=true;
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            ActEna = !ActEna;
        }
    }

应用程序启动时标签值为 True。

当用户点击切换按钮时，标签没有更新。

如何解决这个问题？

Answer 1

您需要实现 INotifyPropertyChanged 才能使数据绑定正常工作。看看这里，它解释得很好https://docs.microsoft.com/en-us/dotnet/api/system.componentmodel.inotifypropertychanged?view=netcore-3.1。

你会有类似的东西：

public partial class MainWindow : Window, INotifyPropertyChanged

private bool _actEna;
public bool ActEna
{
   get
       {
        return _actEna; 
       }
   set
       {
        _actEna = value;
        RaisePropertyChanged();
       }

private void Button_Click(object sender, RoutedEventArgs e)
{
   ActEna = !ActEna;

} 
public event PropertyChangedEventHandler PropertyChanged;  
private void RaisePropertyChanged([CallerMemberName] String propertyName = "")        
{  
   PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));      
}