WPF网格：矩形作为透明覆盖

Question

我在WPF 4.5中有一个画布，想要用UserControl覆盖它，它主要由

组成

带有标签和半透明矩形作为背景的网格：

<UserControl x:Class="Cwss.Tactical.Navigation.ObjectInfoView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:u="clr-namespace:Cwss.Utils.Converter"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             mc:Ignorable="d"
             d:DesignHeight="300"
             d:DesignWidth="300">
  <UserControl.Resources>
    <ResourceDictionary>
      <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="/Tactical/Styles/CommonStyle.xaml"></ResourceDictionary>
        <ResourceDictionary>
          <Style x:Key="AttrName"
                 TargetType="{x:Type Label}">
            <Setter Property="Foreground"
                    Value="White" />
            <Setter Property="FontSize"
                    Value="14"></Setter>
          </Style>
          <Style x:Key="AttrValue"
                 TargetType="{x:Type Label}">
            <Setter Property="Foreground"
                    Value="Yellow" />
            <Setter Property="FontSize"
                    Value="14"></Setter>
          </Style>
        </ResourceDictionary>
      </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
  </UserControl.Resources>


  <Grid Width="300"
        Height="200">

    <Grid.ColumnDefinitions>
      <ColumnDefinition Width="Auto" />
      <ColumnDefinition Width="Auto" />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
      <RowDefinition Height="Auto" />
      <RowDefinition Height="Auto" />
      <RowDefinition Height="Auto" />
      <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>

    <Rectangle Panel.ZIndex="-1"
               Opacity=".5"
               Width="300"
               Height="200"
               Fill="Blue"
               Stroke="Blue"
               StrokeThickness="2"
               RadiusX="8"
               RadiusY="8">
    </Rectangle>

    <Label Style="{StaticResource AttrName}"
           Grid.Column="0"
           Content="Class"></Label>
    <Label Style="{StaticResource AttrValue}"
           Grid.Column="1"
           Name="ObjectKnowledge_Clas"
           Content="Hi"></Label>
    <Label Style="{StaticResource AttrName}"
           Grid.Column="0"
           Grid.Row="1"
           Content="Range"></Label>
    <Label Style="{StaticResource AttrValue}"
           Grid.Column="1"
           Grid.Row="1"
           Content="{Binding ObjectKnowledge.Range, Converter={u:RangetoStringConverter}}"></Label>
  </Grid>
</UserControl>

对我来说奇怪的是，第一个标签会在矩形，

上呈现

但所有其他标签都没有。谢谢你让我知道我在这里做错了什么！

Answer 1

你的Rectangle被渲染为网格中的第一个元素Row=0和Column=0（网格假定为默认值）

将矩形切换为：

<Rectangle Grid.RowSpan="4"
           Grid.ColumnSpan="2"
           Width="300"
           Height="200"
           Panel.ZIndex="-1"
           Fill="Blue"
           Opacity=".5"
           RadiusX="8"
           RadiusY="8"
           Stroke="Blue"
           StrokeThickness="2" />

现在你看到了其他标签。

您应该使用Snoop，这可能会突出显示您的问题