绑定到代码中的DependencyProperty(除了更改通知)

本文关键字：通知 代码 DependencyProperty 绑定 | 更新日期: 2023-09-27 17:57:40

有没有一种方法可以绑定到C#中的依赖属性（就像XAML一样）？

我知道我可以进行更改通知，但我希望有一种方法可以进行"双向"绑定。（因此，更改我的值会更改依赖属性。）

示例：

在我的用户控制视图中

public static readonly DependencyProperty IsRequiredProperty =
    DependencyProperty.Register("IsRequired", typeof(bool), 
        typeof(MyUserControl), new FrameworkPropertyMetadata(default(bool)));
public bool IsRequired
{
    get { return (bool)GetValue(IsRequiredProperty); }
    set { SetValue(IsRequiredProperty, value); }
}

在我看来模型：

 // This is the one I want bound to the dependency property.
 bool IsRequired { //INotifyPropertyChanged getter and setter}
 public void SomeCommandExec(Object obj)
 {
     // Update the dependency property by doing this:
     IsEnabled = False;
 }

绑定到代码中的DependencyProperty(除了更改通知)

您可以在C#中做到这一点-您必须手动构建绑定：

// You need these instances
var yourViewModel = GetTheViewModel();
var yourView = GetYourView();
Binding binding = new Binding("IsRequired");
binding.Source = yourViewModel;
binding.Mode = BindingMode.TwoWay;
yourView.SetBinding(YourViewType.IsRequiredProperty, binding);

有关详细信息，请参阅如何：在代码中创建绑定。

嗨，试试这个

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = new ViewModel();
        Binding binding = new Binding("IsRequired")
        {
            Source = UserControl1.IsRequiredProperty,
            Mode = BindingMode.TwoWay
        };
    }
}
public class ViewModel : INotifyPropertyChanged
{
    private bool isRequired;
    public bool IsRequired
    {
        get { return isRequired; }
        set { isRequired = value; Notify("IsRequired"); }
    }
    public event PropertyChangedEventHandler PropertyChanged;
    private void Notify(string propName)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(propName));
    }
    private CommandHandler mycommand;
    public CommandHandler MyCommand { get { return mycommand ?? (mycommand = new CommandHandler((obj) => OnAction(obj))); } }
    private void OnAction(object obj)
    {
        IsRequired = true;
    }
}
public class CommandHandler : ICommand
{
    public CommandHandler(Action<object> action)
    {
        action1 = action;
    }
    Action<object> action1;
    public bool CanExecute(object parameter)
    {
        return true;
    }
    public event EventHandler CanExecuteChanged;
    public void Execute(object parameter)
    {
        action1(parameter);
    }
}
public partial class UserControl1 : UserControl
{
    public UserControl1()
    {
        InitializeComponent();
    }
    public static readonly DependencyProperty IsRequiredProperty = DependencyProperty.Register("IsRequired", typeof(bool), typeof(UserControl1), new FrameworkPropertyMetadata(default(bool)));
    public bool IsRequired
    {
        get { return (bool)GetValue(IsRequiredProperty); }
        set { SetValue(IsRequiredProperty, value); }
    }
}
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="*"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <local:UserControl1></local:UserControl1>
    <Button Command="{Binding MyCommand}" Grid.Row="1" Content="Action"/>
</Grid>

我希望这会有所帮助。

相关文章：