如何在Windows窗体中强制关注控件 [英] How to force a focus on a control in windows forms

问题描述

我正在尝试在Windows窗体应用程序中关注搜索文本框控件。该文本框位于用户控件内部，该控件位于Windows窗体内部的面板（如果重要）中。
我尝试了3种可以找到的方法：

I am trying to focus a "search" textbox control in my windows forms application. This textbox is inside a user control, which is inside a panel which is inside a windows form (if it is important). I tried 3 methods which I could find:

// 1
this.ActiveControl = myTextBox;

// 2
myTextBox.Focus();

// 3
myTextBox.Select();

它们似乎都不起作用。我的意思是，例如，当我尝试第一个控件时，活动控件确实设置为myTextBox，但是当我尝试在键盘上写东西时，文本框不接受它，因此我必须先在文本框内单击以获取焦点。所有方法都是一样的。
我错过了什么吗？

Neither of them seems to work. I mean for example when I try the first one, active control is really set to myTextBox, but when I try to write something on keyboard, textbox doesn't accept it and I have to first click inside the textbox to get focus. This is same with all of the methods. Am I missing something?

推荐答案

好，终于找到了答案：

正如我所说，我的文本框位于用户控件内部，该控件位于面板内部的窗体内。
当我需要用户控件时，将其添加到面板中。要专注于我的文本框，我必须首先关注用户控件，如下所示：
在我的顶级表单中：

As I said my textbox is inside user control which is inside panel which is inside a form. When I need my user control I add it to panel. To get focus on my textbox I have to firstly focus my user control so something like this: In my top Form:

panel.Controls.Add(myUserControl);
myUserControl.Focus();

，然后在我的用户控件中：

and then in my user control:

myTextBox.Select();

请注意，如果使用：myTextBox.Focus（），它将无法正常工作（不知道为什么）。另外，如果我使用myUserControl.Select（）而不是myUserControl.Focus（）也不起作用。

Note that if I used: myTextBox.Focus() it wouldn't work (don't know why). Also if I used myUserControl.Select() instead of myUserControl.Focus() it wouldn't work either.

这似乎是唯一可行的组合。

This seems to be the only combination which works.

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