其中'；UWP中的FrameworkPropertyMetadata

本文关键字：中的 FrameworkPropertyMetadata UWP 其中 | 更新日期: 2023-09-27 18:21:51

和/或我如何在我的控件上定义一个指定AffectsMeasure的DependencyProperty？

编辑：哦，刚刚看到这个-我必须在属性更改器的this上调用InvalidateMeasure吗？

其中'；UWP中的FrameworkPropertyMetadata

对不起。对于UWP事件，不支持Measure。对于Framework 3+，它是有效的。对于默认的UWP绑定，我正在使用CodeSnipped功能。通过事件处理，您可以表现得透明。我的UWP代码段的结果对于我的型号来说是这样的：

    #region IsSelected
    public static readonly DependencyProperty IsSelectedProperty =
        DependencyProperty.Register("IsSelected", typeof(bool), typeof(PositionModel),
            new PropertyMetadata((bool)false,
                new PropertyChangedCallback(OnIsSelectedChanged)));
    public bool IsSelected
    {
        get { return (bool)GetValue(IsSelectedProperty); }
        set { SetValue(IsSelectedProperty, value); }
    }
    private static void OnIsSelectedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        PositionModel target = (PositionModel)d;
        bool oldIsSelected = (bool)e.OldValue;
        bool newIsSelected = target.IsSelected;
        target.OnIsSelectedChanged(oldIsSelected, newIsSelected);
    }
    protected virtual void OnIsSelectedChanged(bool oldIsSelected, bool newIsSelected)
    {
       // Do what your need in your property changed event
       // In my case, I just raise the PropertyChanged for PropertyChangedEventHandler
       // RaisePropertyChanged(nameof(IsSelected));
    }
    #endregion

XAML:

<Rectangle Fill="Black" Visibility="{x:Bind IsSelected, Mode=OneWay, Converter={StaticResource BoolToVis}}" />

Windows 10，商店，VS 2017，Microsoft.NETCore.UniversalWindowsPlatform 5.2.3版

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