当窗体没有焦点时，RichTextBox不会在鼠标按下时开始选择 [英] RichTextBox doesn't start selection on mouse down when the form has not focus

问题描述

我正在使用WinForms，在我的窗体上有一个RichTextBox.当我的表单失去焦点但可见时，并且我尝试突出显示/选择文本时，直到表单或文本框本身具有焦点时，它才允许我这么做.

I'm using WinForms and on my Form I have a RichTextBox. When my form is out of focus but visible and I try to highlight/select text, it does not allow me to until the form or textbox itself has focus.

我尝试过:

txtInput.MouseDown += (s, e) => { txtInput.Focus(); }

但无济于事，而且我似乎无法在网上找到有关此问题的任何信息.

but to no avail and I can't seem to find anything online about this issue.

在使用其他程序(例如记事本)进行测试时，它确实具有所需的行为.

When testing with another program like Notepad, it does possess the desired behavior.

推荐答案

MouseDown 为时已晚.

这肯定是一种解决方法，但可能仅是您需要的:

This is a workaround for sure, but may be all you need:

private void txtInput_MouseMove(object sender, MouseEventArgs e)
{
    txtInput.Focus();
}

或者当然是

txtInput.MouseMove += (s, e) => { txtInput.Focus(); }

按原样，当您移至文本框上方时，它可能会从表单上的其他控件中夺取焦点.如果这是个问题，您可以使用

As it is it may steal focus from other controls on your form when you move over the textbox. If this is a problem you could prevent it by checking if your program is active using one the of answers here..

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