wpf 将焦点设置在 UserControl 中的 TextBox 上
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Set focus on TextBox in UserControl
提问by Eric after dark
In my program I have a user control that displays data on a window using a content presenter. I would like to simply set the cursor focus on a certain textBoxin my window at startup.
在我的程序中，我有一个用户控件，它使用内容展示器在窗口上显示数据。我想textBox在启动时简单地将光标焦点设置在我的窗口中的某个上。
Usually I would do this through the code-behind of the window, like this: textBox.Focus();
通常我会通过窗口的代码隐藏来做到这一点，如下所示： textBox.Focus();
However, the textBoxis defined in the user control, and doesn't seem to work the same way. So far I have tried the same method as above in the user control's code-behind.
但是，textBox是在用户控件中定义的，并且工作方式似乎不同。到目前为止，我已经在用户控件的代码隐藏中尝试了与上面相同的方法。
Why doesn't this work? How do I set the focus if the textBoxis defined in a user control?
为什么这不起作用？如果textBox是在用户控件中定义的，如何设置焦点？
What I have tried....:
我尝试过的....：
User Control:
用户控制：
public UserControl()
{
InitializeComponent();
FocusManager.SetFocusedElement(this, textBox);
}
User Control:
用户控制：
public UserControl()
{
InitializeComponent();
textBox.Focusable = true;
Keyboard.Focus(textBox);
}
回答by JTFRage
Give this a try: FocusManager.SetFocusedElement
试试这个： FocusManager.SetFocusedElement
FocusManager.SetFocusedElement(parentElement, textBox)
or from the msdn website:
或从 msdn 网站：
textBox.Focusable = true;
Keyboard.Focus(textBox);
Note: You can't set focus in a constructor. If you are, UI Elements have not been created at that point. You should set focus during the Loaded event of your control.
注意：您不能在构造函数中设置焦点。如果是，则此时尚未创建 UI 元素。您应该在控件的 Loaded 事件期间设置焦点。
回答by Loetn
You can try setting the focus in the Loadedor Initializedevent of the User control. Eg:
您可以尝试在Loaded或Initialized事件中设置焦点User control。例如：
private void MyWpfControl_Load(object sender, EventArgs e)
{
textBox.Focusable = true;
Keyboard.Focus(textBox);
}
Info: Loaded eventor Initialized event
回答by Ieskudero
A little bit late but what it really worked for my was
有点晚了，但真正对我有用的是
public UserControl()
{
InitializeComponent();
Dispatcher.BeginInvoke(new System.Action(() => { Keyboard.Focus(TextBox); }),
System.Windows.Threading.DispatcherPriority.Loaded);
}
