显示控件时将焦点置于文本框

发布于 2024-12-11 17:05:01 字数 893 浏览 0 评论 0原文

有一个自定义 UserControl，其中包含一个 TextBox。当显示 UserControl 时如何将焦点集中到文本框？我尝试在 UserControl.IsVisibleChanged 和 TextBox.IsVisibleChanged 事件上调用 TextBox.Focus ，但这没有帮助。我还能尝试什么？

似乎有什么原因导致 TextBox 失去焦点。我提到的方法通常是有效的。如何找出导致 TextBox 失去焦点的原因？我尝试监听 TextBox.LostFocus 事件，但它的参数不包含太多有价值的信息，而且我也没有在堆栈跟踪中看到以前的方法。

代码：

   void TextBox1_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            if (this.TextBox1.IsVisible)
                this.TextBox1.Focus();
        }

正如我之前所说，如果我在测试项目中的类似场景中使用相同的代码，它就可以工作，但它在我的应用程序中不起作用（应用程序很大，我基本上是在修复其中的错误，并且这就是其中之一）。所以我认为问题不在于焦点设置不当（正如我在打开这个问题时所想的那样），我认为问题在于其他东西重置了焦点。我试图在这里找到它是什么：找出文本框失去焦点的原因< /a> .

原文

There is a custom UserControl which contains a TextBox. How do I give focus to the textbox when UserControl is shown? I've tried calling TextBox.Focus on UserControl.IsVisibleChanged and TextBox.IsVisibleChanged event, but that didn't help. What else can I try?

It seems that something causes TextBox to loose focus. The approach that I've mentioned normally works. How can I find out what causes the TextBox to loose focus? I've tried listening to TextBox.LostFocus event, but it's parameters don't contain much valuable information and I also don't see previous methods in the stack trace.

The code:

   void TextBox1_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            if (this.TextBox1.IsVisible)
                this.TextBox1.Focus();
        }

As I've said before, it works if I use same code on a similar scenario in a test project, but it doesn't work in my application (the application is big and I am basically fixing bugs in it, and this one is amongst them). So I think that the problem isn't that focus is set improperly (as I've thought when I was opening this question), I think that the problem is that something else resets the focus. I am trying to find what it is here: Find out why textbox has lost focus .

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