如何获得焦点时突出显示控件? [英] How to highlight the control when it gets focus?

问题描述

我可以使用以下方法突出显示单个MaskedTextBox中的文本:

I can highlight the text in an individual MaskedTextBox when it gets focus using:

this.myTextBox.SelectAll();

但是，当发生鼠标单击事件时，我想对所有MaskedTextBox都执行此操作.我不想为每个MaskedTextbox添加30个单独的事件方法，而是要选择所有MaskedTextBox并有一个事件方法来处理它，即:

But, I want to do it for all MaskedTextBox when a mouse click event occurs. Instead of adding 30 individual event method for each MaskedTextbox, I want to select all MaskedTextBox and have one event method to take care of it, ie:

private void MouseClickedForMaskedTextBox(object sender, MouseEventArgs e)
{
    this.ActiveControl.SelectAll();
}

但是SelectAll不适用于this.ActiveControl.有办法解决吗?

But SelectAll is not available for this.ActiveControl. Is there a way to get around it?

推荐答案

sender将成为事件的目标.

您可以投射sender:

MaskedTextBox maskedTextBox = sender as MaskedTextBox;
if (maskedTextBox != null) { maskedTextBox.SelectAll(); }

或者在C#7中，

if (sender is MaskedTextBox maskedTextBox) 
{
    maskedTextBox.SelectAll();
} 

另一个改进是使用TextBoxBase，它也可以与TextBox和RichTextBox一起使用.

Another improvement is to use TextBoxBase and it will work with TextBox and RichTextBox as well.

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