.Net5 WPF 使用 WindowsFormsHost

（1）csproj文件添加

<UseWindowsForms>true</UseWindowsForms>

如图：

添加前后框架对比

（2）WPF窗口引入命名空间

xmlns:wfh="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration"
xmlns:wfc="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"

（3）使用

<Grid Grid.Row="1" Background="Black">
    <!--<ContentControl Content="{Binding VideoWind}" />-->
    <WindowsFormsHost VerticalAlignment="Center" Height="300" Width="350" HorizontalAlignment="Center" Margin="10">
        <wfc:Panel x:Name="ctrVideo" BackColor="gray" Dock="Fill" />
    </WindowsFormsHost>
</Grid>