WPF中TreeView控件的數據綁定和后臺動態添加數據可以通過以下步驟實現：

1. 在XAML中定義TreeView控件：

<TreeView x:Name="MyTreeView" ItemsSource="{Binding TreeData}">
    <TreeView.ItemTemplate>
        <HierarchicalDataTemplate ItemsSource="{Binding Children}">
            <TextBlock Text="{Binding Name}" />
        </HierarchicalDataTemplate>
    </TreeView.ItemTemplate>
</TreeView>

2. 在后臺代碼中定義數據模型和數據源：

public class TreeNode
{
    public string Name { get; set; }
    public ObservableCollection<TreeNode> Children { get; set; }
}

public class ViewModel
{
    public ObservableCollection<TreeNode> TreeData { get; set; }

    public ViewModel()
    {
        // 初始化數據源
        TreeData = new ObservableCollection<TreeNode>
        {
            new TreeNode
            {
                Name = "Parent 1",
                Children = new ObservableCollection<TreeNode>
                {
                    new TreeNode { Name = "Child 1" },
                    new TreeNode { Name = "Child 2" }
                }
            },
            new TreeNode
            {
                Name = "Parent 2",
                Children = new ObservableCollection<TreeNode>
                {
                    new TreeNode { Name = "Child 3" },
                    new TreeNode { Name = "Child 4" }
                }
            }
        };
    }
}

3. 在窗口或頁面的構造函數中設置數據上下文并動態添加數據：

public MainWindow()
{
    InitializeComponent();

    // 設置數據上下文
    DataContext = new ViewModel();

    // 動態添加數據
    TreeNode newNode = new TreeNode { Name = "New Node" };
    ((ViewModel)DataContext).TreeData.Add(newNode);
}

通過以上步驟，TreeView控件就可以實現數據綁定，并且可以在后臺動態添加數據。