WPF 将窗口标题绑定(bind)到属性

Question

我正在尝试绑定(bind)从 Window 派生的类 (MainWindow) 的属性 (MyTitle) 的值。我创建了一个名为 MyTitleProperty 的依赖属性，实现了 INotifyPropertyChanged 接口(interface)并修改了 MyTitle 的 set 方法以调用 PropertyChanged 事件，并将“MyTitle”作为属性名称参数传递。我在构造函数中将 MyTitle 设置为“Title”，但是当窗口打开时标题为空白。如果我在 Loaded 事件上放置一个断点，则 MyTitle = "Title"但 this.Title = ""。这肯定是我没有注意到的非常明显的事情。请帮忙!

MainWindow.xaml

<Window
    x:Class="WindowTitleBindingTest.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:this="clr-namespace:WindowTitleBindingTest"
    Height="350"
    Width="525"
    Title="{Binding Path=MyTitle, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type this:MainWindow}}}"
    Loaded="Window_Loaded">
    <Grid>

    </Grid>
</Window>

MainWindow.xaml.cs:

public partial class MainWindow : Window, INotifyPropertyChanged
{
    public static readonly DependencyProperty MyTitleProperty = DependencyProperty.Register("MyTitle", typeof(String), typeof(MainWindow));

    public String MyTitle
    {
        get { return (String)GetValue(MainWindow.MyTitleProperty); }
        set
        {
            SetValue(MainWindow.MyTitleProperty, value);
            OnPropertyChanged("MyTitle");
        }
    }

    public MainWindow()
    {
        InitializeComponent();

        MyTitle = "Title";
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected void OnPropertyChanged(String propertyName)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
    }
}

Answer 1

public MainWindow()
{
    InitializeComponent();

    DataContext = this;

    MyTitle = "Title";
}

那么你只需要在XAML中

Title="{Binding MyTitle}"

那么您就不需要依赖属性。