wpf tooltip 样式自定义

<Style BasedOn="{StaticResource {x:Type ToolTip}}" TargetType="ToolTip">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToolTip}">
<Border Width="128"
Height="98"
BorderBrush="#FFDEE7F6"
BorderThickness="1"
CornerRadius="5">
<Border.Background>
<SolidColorBrush Opacity="0.8" Color="White" />
</Border.Background>
<Grid Margin="10,15,0,15">
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<TextBlock VerticalAlignment="Center" Text="{Binding Tag.CityName}" />
<TextBlock Grid.Row="1"
VerticalAlignment="Center"
Text="{Binding Tag.Total, StringFormat=总量：{0} 辆}" />
<TextBlock Grid.Row="2"
VerticalAlignment="Center"
Text="{Binding Tag.TodayCount, StringFormat=今日：{0} 辆}" />
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>

<Path Name="HaiNan"
Stroke="#FF113FBB"
StrokeThickness="0.5"
Tag="xxxxx">
<Path.ToolTip>
<ToolTip DataContext="{Binding Path=PlacementTarget, RelativeSource={x:Static RelativeSource.Self}}" />
</Path.ToolTip>

</Path >

把需要传入tooltip内的值付到对象的tag对象内，然后tooltip绑定tag作为数据上下文