c# - 如何设置在代码隐藏中声明的依赖属性

Question

我正在尝试将 ViewModel 类的值绑定(bind)到在 Window 类后面的代码中声明的自定义属性。我从这个例子中得到的是“成员'FullScreen'未被识别或不可访问。”错误。

这是 MainWindow 类:

public partial class MainWindow : Window
    {
        public static readonly DependencyProperty FullScreenProperty =
            DependencyProperty.Register(nameof(FullScreen), typeof(bool),
                typeof(MainWindow), new PropertyMetadata(default(bool), PropertyChangedCallback));

        public bool FullScreen
        {
            get => (bool)GetValue(FullScreenProperty);
            set => SetValue(FullScreenProperty, value);
        }

        private static void PropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var value = (bool)e.NewValue;
            //this.GoToFullScreen(value);
        }

        public MainWindow()
        {
            InitializeComponent();
        }
    }

XAML 部分:

<Window x:Class="WindowDependencyPropertyTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WindowDependencyPropertyTest"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800" FullScreen="{Binding FullScreenFromVm}" >
    <Grid>

    </Grid>
</Window>

实现此功能的最佳方法是什么？

Answer 1

前提是 MainWindow 的 DataContext设置为具有 FullScreenFromVm 的对象属性(property)，这应该工作:

<Window x:Class="WindowDependencyPropertyTest.MainWindow" ...>
    <Window.Style>
        <Style>
            <Setter Property="local:MainWindow.FullScreen"
                    Value="{Binding FullScreenFromVm}"/>
        </Style>
    </Window.Style>
    ...
</Window>

或者您在 MainWindow 构造函数中绑定(bind)属性:

public MainWindow()
{
    InitializeComponent();
    SetBinding(FullScreenProperty, new Binding("FullScreenFromVm"));
}