为WPF控件ToolTip添加条件可见性

<Window x:Class="WpfApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <Style x:Key="ToolTipStyle" TargetType="ToolTip">
            <Setter Property="Background" Value="LightGray"/>
            <Setter Property="BorderBrush" Value="Black"/>
            <Setter Property="BorderThickness" Value="1"/>
        </Style>
    </Window.Resources>
    <Grid>
        <Button Content="Button" ToolTip="ToolTip" ToolTipService.IsEnabled="{Binding IsToolTipVisible}">
            <Button.ToolTip>
                <ToolTip Style="{StaticResource ToolTipStyle}" Visibility="{Binding IsToolTipVisible, Converter={StaticResource BoolToVisibilityConverter}}">
                    <TextBlock Text="This is a tooltip."/>
                </ToolTip>
            </Button.ToolTip>
        </Button>
    </Grid>
</Window>

using System.ComponentModel;
using System.Windows;

namespace WpfApp
{
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        private bool isToolTipVisible;

        public bool IsToolTipVisible
        {
            get { return isToolTipVisible; }
            set
            {
                isToolTipVisible = value;
                OnPropertyChanged(nameof(IsToolTipVisible));
            }
        }

        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
        }

        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged(string propertyName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

using System;
using System.Globalization;
using System.Windows;
using System.Windows.Data;

namespace WpfApp
{
    public class BoolToVisibilityConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is bool isVisible)
            {
                return isVisible ? Visibility.Visible : Visibility.Collapsed;
            }
            return Visibility.Collapsed;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}