1、添加两个引用：WindowsFormsIntegration.dll（负责整合WPF和Windows）、System.Windows.Forms.
2、在 XAML文件中添加两个引用（粗体部分）：
<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>
3、在XAML添加控件：
<WindowsFormsHost Name="windowsFormsHost" Margin="0" Background="#FF323E34">
<wf:PictureBox Name="mainBox" Paint="PictureBox_Paint"></wf:PictureBox>
</WindowsFormsHost>