将 Windows 窗体转换为 WPF

Question

以下是我在 Windows 窗体应用程序中的代码的一部分，考虑到this.Controls不可用，如何将其转换为 WPF：

public Form1()
        {
            InitializeComponent();
            foreach (TextBox tb in this.Controls.OfType<TextBox>())
            {
                tb.Enter += textBox_Enter;
            }
        }
        void textBox_Enter(object sender, EventArgs e)
        {
            focusedTextbox = (TextBox)sender;
        }
private TextBox focusedTextbox = null;
private void button1_Click (object sender, EventArgs e)
        {
            if (focusedTextbox != null)
            {
                focusedTextbox.Text += "1";
            }
        }

Answer 1

监听根

元素（很可能是窗口本身）上的PreviewGotKeyboardFocus并记录e.NewFocus参数。 预览事件在可视化树中冒泡，因此在父控件中公开预览事件的任何控件都将触发它（请参阅路由事件）。

事件处理程序变为：

    private void OnGotFocusHandler(object sender, KeyboardFocusChangedEventArgs e)
    {
        var possiblyFocusedTextbox = e.NewFocus as TextBox;
        //since we are now receiving all focus changes, the possible textbox could be null
        if (possiblyFocusedTextbox != null)
            focusedTextbox = possiblyFocusedTextbox;
    }