【WPF】WPF中调用Winform

<Window x:Class="CrossBowDemo.MainWindow"
xmlns:wfi ="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration"
xmlns:wf ="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Hosting Windows Forms Control In WPF"
Height="300"
Width="650"
ResizeMode="NoResize"
Loaded="WindowLoadedHandler">
</Window>

<WindowsFormsHost Name="windowsFormsHost" Margin="0"  Background="#FF323E34">
       <wf:PictureBox Name="mainBox" Paint="PictureBox_Paint"></wf:PictureBox>
</WindowsFormsHost>