在 WPF 應用程式中，我使用模板來設定驗證工具提示的樣式（帶圓角的紅色工具提示）：
<ControlTemplate x:Key="CommonValidationToolTipTemplate" TargetType="ToolTip">
<Grid x:Name="Root" Margin="5,0" RenderTransformOrigin="0,0" Opacity="0">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup Name="OpenStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0" />
<VisualTransition To="Open" GeneratedDuration="0:0:0">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="1" Duration="0:0:0" />
</Storyboard>
</VisualTransition>
</VisualStateGroup.Transitions>
<VisualState x:Name="Closed">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="0" Duration="0" />
</Storyboard>
</VisualState>
<VisualState x:Name="Open">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="1" Duration="0" />
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Border Margin="4,4,-4,-4" Background="#052A2E31" CornerRadius="5" />
<Border Margin="3,3,-3,-3" Background="#152A2E31" CornerRadius="4" />
<Border Margin="2,2,-2,-2" Background="#252A2E31" CornerRadius="3" />
<Border Margin="1,1,-1,-1" Background="#352A2E31" CornerRadius="2" />
<Border Background="#FFDC000C" CornerRadius="2">
<TextBlock Foreground="White" Margin="8,4,8,4" MaxWidth="250" TextWrapping="Wrap" Text="{Binding (Validation.Errors)[0].ErrorContent}" />
</Border>
</Grid>
</ControlTemplate>
模板通過使用樣式應用于視圖元素：
<Style x:Key="ValidatingControlStyle" TargetType="{x:Type FrameworkElement}">
<Setter Property="Validation.ErrorTemplate" Value="{StaticResource CommonValidationToolTipTemplate}" />
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="True">
<Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors)[0].ErrorContent}" />
</Trigger>
</Style.Triggers>
</Style>
不幸的是，自定義工具提示不會顯示在驗證錯誤上。顯示“標準”工具提示。
我究竟做錯了什么？
uj5u.com熱心網友回復：
你為什么要設定Validation.ErrorTemplate風格ToolTip...？
你應該Template在ToolTip你的Style：
<Style x:Key="ValidatingControlStyle" TargetType="{x:Type FrameworkElement}">
<Style.Resources>
<Style TargetType="ToolTip">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ToolTip">
<Grid x:Name="Root" Margin="5,0" RenderTransformOrigin="0,0" Opacity="0">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup Name="OpenStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0" />
<VisualTransition To="Open" GeneratedDuration="0:0:0">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="1" Duration="0:0:0" />
</Storyboard>
</VisualTransition>
</VisualStateGroup.Transitions>
<VisualState x:Name="Closed">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="0" Duration="0" />
</Storyboard>
</VisualState>
<VisualState x:Name="Open">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="1" Duration="0" />
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Border Margin="4,4,-4,-4" Background="#052A2E31" CornerRadius="5" />
<Border Margin="3,3,-3,-3" Background="#152A2E31" CornerRadius="4" />
<Border Margin="2,2,-2,-2" Background="#252A2E31" CornerRadius="3" />
<Border Margin="1,1,-1,-1" Background="#352A2E31" CornerRadius="2" />
<Border Background="#FFDC000C" CornerRadius="2">
<TextBlock Foreground="White" Margin="8,4,8,4" MaxWidth="250" TextWrapping="Wrap"
Text="{TemplateBinding Content}" />
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Style.Resources>
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="True">
<Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self},
Path=(Validation.Errors)[0].ErrorContent}" />
</Trigger>
</Style.Triggers>
</Style>
...然后將其應用于元素，例如：
<TextBox Text="{Binding Text}" Style="{StaticResource ValidatingControlStyle}" />
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