如果您可以编写引用“标准”(clr)属性的代码,那么您最好去：

>声明您的DependencyProperty
>删除您的支持字段并替换标准属性的实现,以便它访问DependencyProperty而不是支持字段.

public class MyXamDateTimeEditor : XamDateTimeEditor
{
    public static readonly DependencyProperty IsSelectOnFocusEnabledProperty = 
      DependencyProperty.Register("IsSelectOnFocusEnabled",typeof(bool),typeof(MyXamDateTimeEditor),new UIPropertyMetadata(false));

    public boolIsSelectOnFocusEnabled
    {
        get
        {
            return (bool)GetValue(IsSelectOnFocusEnabledProperty);
        }
        set
        {
            SetValue(IsSelectOnFocusEnabledProperty,value);
        }
    }
}

然后,当您在代码中访问IsSelectOnFocusEnabled时,它将返回Dependency属性的当前值.

您也可以将其设置为在属性更改时接收通知,但我不明白为什么您会这样做.

这个技巧还有另一种选择,如果你愿意,它不使用继承和附加属性.

更新：

好的,因为它是被请求的,这是一种实现任何文本框的方法.它应该很容易转换为您用于在其他类型的控件上执行的任何事件.

public class TextBoxBehaviors
    {
        public static bool GetIsSelectOnFocusEnabled(DependencyObject obj)
        {
            return (bool)obj.GetValue(IsSelectOnFocusEnabledProperty);
        }

        public static void SetIsSelectOnFocusEnabled(DependencyObject obj,bool value)
        {
            obj.SetValue(IsSelectOnFocusEnabledProperty,value);
        }

        public static readonly DependencyProperty IsSelectOnFocusEnabledProperty =
            DependencyProperty.RegisterAttached("IsSelectOnFocusEnabled",typeof(TextBoxBehaviors),new UIPropertyMetadata(false,new PropertyChangedCallback(OnSelectOnFocusChange)));

        private static void OnSelectOnFocusChange(DependencyObject d,DependencyPropertyChangedEventArgs e)
        {
            if (d is TextBox)
            {
                var tb = d as TextBox;
                if ((bool)e.NewValue)
                {
                    tb.GotFocus += new RoutedEventHandler(tb_GotFocus);
                }
                else
                {
                    tb.GotFocus -= new RoutedEventHandler(tb_GotFocus);
                }
            }
        }

        static void tb_GotFocus(object sender,RoutedEventArgs e)
        {
            var tb = sender as TextBox;

            tb.SelectAll();
        }

    }

您使用它的方式如下,例如：

<Window x:Class="WpfApplication2.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WpfApplication2"        
    Title="Window1" Height="300" Width="300">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="Auto" />
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <TextBox Text="No Select All" x:Name="TextBox1"/>
        <CheckBox Content="Auto Select"
                  Grid.Column="1"
                  IsChecked="{Binding Path=(local:TextBoxBehaviors.IsSelectOnFocusEnabled),ElementName=TextBox1,Mode=TwoWay}" />
        <TextBox Grid.Row="1" Text="djkhfskhfkdssdkj"
                 local:TextBoxBehaviors.IsSelectOnFocusEnabled="true" />
    </Grid>
</Window>

这将向您展示如何设置属性以激活行为,以及如何在需要时将其绑定到其他内容.请注意,此特定示例并不完美(如果您通过它进行选项卡工作,如果您在控件内部单击,则文本框具有实际取消选择文本的内部逻辑,但这只是关于如何通过附加属性将行为附加到控件的示例) .