WPF--绑定自定义数据类型

WPF作为数据绑定的目标：
使用DataContext属性，表示当前控件中的每个元素都绑定此数据:
数据类型定义：

public class FamilyData
{
    private string m_familyName;
    private string m_width;
    private string m_height;

    public string FamilyName
    {
        get { return m_familyName; }
        set { m_familyName = value; }
    }

    public string Width
    {
        get { return m_width; }
        set{ m_width = value; }
    }

    public string Height
    {
        get { return m_height; }
        set { m_height = value; }
    }
}

XAML:

<Grid>
    <StackPanel Name="stackPanel" Orientation="Vertical" HorizontalAlignment="Left">
        <TextBlock Name="txtName" Text="{Binding FamilyName}"/>
       <TextBlock Name="txtWidth" Text="{Binding Width}"/>
        <TextBlock Name="txtHeight" Text="{Binding Height}"/>
       <Button Name="Bnt" Click="btn_Click" Content="确定" MaxWidth="30"/>
    </StackPanel>
</Grid>

对应xaml.cs代码：

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        Init();
    }

    private FamilyData familyData;
    public void Init()
    {
        familyData = new FamilyData();
        familyData.FamilyName = "支吊架族";
        familyData.Width = "200";
        familyData.Height = "500";
        stackPanel.DataContext = familyData;
    }

    private void btn_Click(object sender, RoutedEventArgs e)
    {
        familyData = new FamilyData();
        familyData.FamilyName = "管道附件族";
        familyData.Width = "200W";
        familyData.Height = "500H";
        stackPanel.DataContext = familyData;
    }
}