WPF使用自定义控件UserControl

<UserControl x:Class="BlackBird.Control.UserControl1"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             mc:Ignorable="d"
             d:DesignHeight="600" d:DesignWidth="600">
    <Grid>
          <!--此处省略代码，拷贝网络上的代码到这里，或者自己写-->
    </Grid>
</UserControl>

<bird:UserControl1 x:Name="userControl1" />

<Window x:Class="WpfApplicationDemo.UserControlDemo"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:bird="clr-namespace:BlackBird.Control"
        Title="UserControlDemo" Height="300" Width="300" Loaded="Window_Loaded">
    <Grid>
        <bird:UserControl1 x:Name="userControl11" />
    </Grid>
</Window>

<StackPanel Name="stackPanel1"></StackPanel>

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    UserControl1 demo = new UserControl1();
    this.stackPanel1.Children.Add(demo);
}