c# - 工具提示未显示在 WPF 标签中？

Question

在应用程序中，我试图在标签控件上设置工具提示。请找到详细的 XAML，建议尽可能解决问题。到目前为止，我已经尝试了很多技巧(例如 IsEnabled、IsHitTestVisible、控件模板、背景设置...)，但未能显示工具提示。

<UserControl x:Class="HSDLAdminPortal.Forms.Application.ApplicationDetailForm"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         xmlns:toolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Layout.Toolkit"             
         xmlns:local="clr-namespace:HSDLAdminPortal.Forms.Application"
         mc:Ignorable="d" Width="1290" Height="595"
         xmlns:gif="http://wpfanimatedgif.codeplex.com"              
         xmlns:name="UserControl"
         >
<UserControl.Resources>
    <Style x:Key="LabelInfoStyle" TargetType="{x:Type Label}">
        <Setter Property="FontSize" Value="12"/>
        <Setter Property="Foreground" Value="Black"/>
    </Style>
    <Style x:Key="LabelInfoValueStyle" TargetType="{x:Type Label}">
        <Setter Property="FontSize" Value="12"/>
        <Setter Property="Foreground" Value="#999966"/>
    </Style>
    <Style x:Key="LabelInfoHeaderStyle" TargetType="{x:Type Label}">
        <Setter Property="FontSize" Value="14"/>
        <Setter Property="Foreground" Value="White"/>
    </Style>
</UserControl.Resources>
<Grid Margin="4" Background="Transparent">
    <Grid.Background>
        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
            <GradientStop Color="#e6eeff" Offset="1" />
            <GradientStop Color="#FFF5F2EF" Offset="0" />
        </LinearGradientBrush>
    </Grid.Background>
    <Grid.Resources>
        <ResourceDictionary Source="/Resources/CustomAccordion.xaml"/>
    </Grid.Resources>
    <Grid.RowDefinitions>
        <RowDefinition Height="*" />
        <RowDefinition Height="auto" />
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="auto" />
        <ColumnDefinition Width="*" />
    </Grid.ColumnDefinitions>
    <Grid Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2" Margin="0,-10,730,0" Background="Transparent" Panel.ZIndex="1">
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="auto" />
        </Grid.RowDefinitions>
        <StackPanel>
            <GroupBox Header=""  Margin="0,4,10,4" Height="540" HorizontalAlignment="Right" Width="532">
                <Canvas Margin="0,0,0,1">
                    <Rectangle HorizontalAlignment="Left" Height="19" Stroke="White" VerticalAlignment="Top" Width="493" Canvas.Left="17" Canvas.Top="201">
                        <Rectangle.Fill>
                            <LinearGradientBrush  EndPoint="0.5,1" StartPoint="0.5,0">
                                <GradientStop Color="LightGray" Offset="1" />
                                <GradientStop Color="LightGray" />
                                <GradientStop Color="White" Offset="0.5" />
                            </LinearGradientBrush>
                        </Rectangle.Fill>
                    </Rectangle>
                    <Rectangle Fill="Transparent" HorizontalAlignment="Left" Height="295" Stroke="Gray" VerticalAlignment="Top" Width="493" Canvas.Left="17" Canvas.Top="219"/>
                    <Image Stretch="Fill"  x:Name="ImagePhoto" HorizontalAlignment="Left" VerticalAlignment="Top" Height="123"  Width="120" Source="/HSDLAdminPortal;component/Resources/photo_test.png" Canvas.Top="3" Canvas.Left="37"/>
                    <Label x:Name="LblPhoto" Content="Photo" HorizontalAlignment="Left" Background="Transparent"  VerticalAlignment="Top" FontSize="10" FontWeight="Bold" Height="22" Width="62" Canvas.Top="124" Canvas.Left="75"/>
                    <Border BorderBrush="Black" BorderThickness="1" Height="128" Canvas.Left="37" Canvas.Top="1" Width="119"/>
                    <Rectangle Height="22" Canvas.Left="221"  Canvas.Top="1" Width="289">
                        <Rectangle.Fill>
                            <LinearGradientBrush  EndPoint="0.5,1" StartPoint="0.5,0">
                                <GradientStop Color="LightGray" Offset="1" />
                                <GradientStop Color="LightGray" />
                                <GradientStop Color="White" Offset="0.5" />
                            </LinearGradientBrush>
                        </Rectangle.Fill>
                    </Rectangle>
                    <Rectangle Fill="Transparent" HorizontalAlignment="Left" Height="163" Stroke="White" VerticalAlignment="Top" Width="289" Canvas.Left="221" Canvas.Top="23"/>
                    <Label x:Name="LblMiscellaneous" Style="{DynamicResource LabelInfoHeaderStyle}" Foreground="Black" Content="Miscellaneous" Background="Transparent" Canvas.Left="342" Canvas.Top="-1" Height="28" FontWeight="ExtraBold"/>
                    <Label x:Name="LblPersonalInfo" Style="{DynamicResource LabelInfoHeaderStyle}" Content="Personal Info" Foreground="Black" Background="Transparent" Canvas.Left="221" Canvas.Top="195" Height="54" Width="125" FontWeight="ExtraBold"/>

                    <Label x:Name="LblApplicantType" ToolTip="text tooltip" Style="{DynamicResource LabelInfoStyle}" Content="Applicant Type : " Background="Transparent" Canvas.Left="231" Canvas.Top="40" FontWeight="Bold"/>
                    <Label x:Name="LblApplicantTypeValue" Style="{DynamicResource LabelInfoValueStyle}" Content="N/A" Background="Transparent" Canvas.Left="360" Canvas.Top="40"  FontWeight="Bold"/>

                    <Label x:Name="LblApplicantNameValue" Style="{DynamicResource LabelInfoValueStyle}" ToolTip="Sample ToolTip" Content="N/A" ToolTip="Sample ToolTip" Background="Transparent" Canvas.Left="190" Canvas.Top="220"  FontWeight="Bold"/>
                    <Image x:Name="ImageSignature" HorizontalAlignment="Left" VerticalAlignment="Top" Height="37"  Width="97" Source="/HSDLAdminPortal;component/Resources/signature.png" Canvas.Top="149" Canvas.Left="52"/>
                    <Border BorderBrush="Black" BorderThickness="1" Height="44" Canvas.Left="37" Canvas.Top="142" Width="119"/>
                    <Label x:Name="LblSignature" Content="Signature" HorizontalAlignment="Left" Background="Transparent"  VerticalAlignment="Top" FontSize="10" FontWeight="Bold" Height="36" Width="62" Canvas.Top="181" Canvas.Left="69"/>
                    <Canvas x:Name="AttachmentDetailsCanvas" Width="520" Height="501"  Visibility="Visible" Opacity="0">
                        <Canvas.Background>
                            <LinearGradientBrush  EndPoint="0.5,1" StartPoint="0.5,0">
                                <GradientStop Color="LightGray" Offset="1" />
                                <GradientStop Color="LightGray" />
                                <GradientStop Color="White" Offset="0.5" />
                            </LinearGradientBrush>

                        </Canvas.Background>

                        <Rectangle Height="45" Canvas.Left="0"  Canvas.Top="1" Width="520">
                            <Rectangle.Fill>
                                <LinearGradientBrush  EndPoint="0.5,1" StartPoint="0.5,0">
                                    <GradientStop Color="LightGray" Offset="1.2" />
                                    <GradientStop Color="LightGray" />
                                    <GradientStop Color="#0077b3" Offset="0" />
                                </LinearGradientBrush>
                            </Rectangle.Fill>
                        </Rectangle>
                        <Label x:Name="attachmentDetails" Content="Attachment Details" Foreground="White"  Background="Transparent" FontSize="20"  VerticalAlignment="Top"  FontWeight="Bold" Height="36" Width="220" Canvas.Top="4" Canvas.Left="143" />

                        <Image Source="/Resources/Images/attachment.png" Height="400" Width="510" Canvas.Top="86" x:Name="atcImg"/>
                        <Button ToolTip="Click To Hide Image" x:Name="hideImageButtonButton" Width="42" Height="42" Click="hideImageButton_Click" Canvas.Left="478" Canvas.Top="1">
                            <StackPanel Orientation="Horizontal">
                                <Image x:Name="close_image" HorizontalAlignment="Center" VerticalAlignment="Center" Source="/Resources/hide.png" Height="42" Width="42" OpacityMask="{DynamicResource {x:Static SystemColors.WindowBrushKey}}" Stretch="UniformToFill" />
                            </StackPanel>
                        </Button>
                    </Canvas>
                </Canvas>
            </GroupBox>
        </StackPanel>
    </Grid>

</Grid>

Answer 1

Explicit style. The Style property is set directly. In most scenarios, the style is not defined inline, but instead is referenced as a resource, by explicit key. In this case the Style property itself acts as if it were a local value, precedence item 3.

关于优先级的 MSDN 网站。

由于样式设置为本地值，因此它优先于下一个本地值。

将工具提示添加到您的样式中并添加您想要的文本以使其与您的动态资源一起使用

更新

查看您的代码后，很明显您的标签只是被透明网格覆盖，因此您的鼠标悬停不会真正越过它。放置 Panel.ZIndex="1"它将起作用，因为这会将您的标签置于所有内容的前面

如果您计划使用多个 zindex 来解决您的问题，我还会查看 MSDN 网站，只是为了了解更多相关信息。

https://msdn.microsoft.com/en-us/library/system.windows.controls.panel.zindex(v=vs.110).aspx

  <Label x:Name="LblApplicantNameValue" Panel.ZIndex="1" Style="{DynamicResource LabelInfoValueStyle}" ToolTip="Sample ToolTip" Content="this label now works"  Background="Transparent" Canvas.Left="360" Canvas.Top="66"  FontWeight="Bold"/>