Application.Current.Dispatcher.BeginInvoke(
    new Action(() => { GridNoSignal.Visibility = Visibility.Visible; }), null);

3、.Net5引用System.Windows.Forms

编辑项目文件，添加UseWindowsForms标记。

<PropertyGroup>
  <OutputType>WinExe</OutputType>
  <TargetFramework>net5.0-windows</TargetFramework>
  <UseWPF>true</UseWPF>
  <UseWindowsForms>true</UseWindowsForms>
  <ApplicationIcon>Resources\Images\App.ico</ApplicationIcon>
  <AssemblyName>test</AssemblyName>
</PropertyGroup>

4、修改HandyControl选中颜色

设置附加属性hc:VisualElement.Highlight(BorderBrush、Background、Foreground)即可。

<hc:ButtonGroup Grid.Row="0" Grid.Column="2" Style="{StaticResource ButtonGroupSolid}"
                Orientation="Vertical" Height="280"
                hc:VisualElement.HighlightBorderBrush="Yellow"
                hc:VisualElement.HighlightBackground="Yellow"
                hc:VisualElement.HighlightForeground="{StaticResource PrimaryBrush}"
                HorizontalAlignment="Left" VerticalAlignment="Center">
    <RadioButton Content="1" FontSize="14" Width="50" Height="56"/>
    <RadioButton Content="2" FontSize="14" Width="50" Height="56"/>
    <RadioButton Content="3" FontSize="14" Width="50" Height="56"/>
    <RadioButton Content="4" FontSize="14" Width="50" Height="56"/>
    <RadioButton Content="5" FontSize="14" Width="50" Height="56"/>
</hc:ButtonGroup>