Question

我正在尝试将文本框绑定到依赖项属性以更改其宽度。以下代码无效。有什么帮助吗？

  public class ToolbarManager : DependencyObject
    {
        public static readonly DependencyProperty toolbarButtonWidth = DependencyProperty.Register("toolbarButtonWidth", typeof(Double), typeof(ToolbarManager), new FrameworkPropertyMetadata(32.0, FrameworkPropertyMetadataOptions.AffectsMeasure ));
        public static readonly DependencyProperty toolbarButtonHeight = DependencyProperty.Register("toolbarButtonHeight", typeof(Double), typeof(ToolbarManager), new FrameworkPropertyMetadata(32.0, FrameworkPropertyMetadataOptions.AffectsMeasure));

        public double ButtonWidth
        {
            get { return (double)GetValue(toolbarButtonWidth); }
            set { SetValue(toolbarButtonWidth, value); }
        }

        public double ButtonHeight
        {
            get { return (double)GetValue(toolbarButtonHeight); }
            set { SetValue(toolbarButtonHeight, value); }
        }

        public static ToolbarManager Instance { get; private set; }

        static ToolbarManager()
        {
            Instance = new ToolbarManager();

        }
    }

以下是标记代码：

<TextBox Width="{Binding Source={x:Static local:ToolbarManager.Instance}, Path=ButtonWidth, Mode=OneWay}" />

默认值有效，但如果我修改代码中的值没有任何反应？!!!

Answer 1

重命名您的依赖项属性应解决您的问题

public class ToolbarManager : DependencyObject
{
    public static readonly DependencyProperty ButtonWidthProperty =
      DependencyProperty.Register("ButtonWidth", typeof(Double), typeof(ToolbarManager), new FrameworkPropertyMetadata(32.0, FrameworkPropertyMetadataOptions.AffectsMeasure ));
    public static readonly DependencyProperty ButtonHeightProperty =
      DependencyProperty.Register("ButtonHeight", typeof(Double), typeof(ToolbarManager), new FrameworkPropertyMetadata(32.0, FrameworkPropertyMetadataOptions.AffectsMeasure));

    public double ButtonWidth
    {
        get { return (double)GetValue(ButtonWidthProperty); }
        set { SetValue(ButtonWidthProperty, value); }
    }

    public double ButtonHeight
    {
        get { return (double)GetValue(ButtonHeightProperty); }
        set { SetValue(ButtonHeightProperty, value); }
    }

    public static ToolbarManager Instance { get; private set; }

    static ToolbarManager()
    {
        Instance = new ToolbarManager();
    }
}

希望这会有所帮助

WPF绑定表达式和依赖项属性

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