自动更改活动控件的属性 [英] Changing the properties of the active control automatically

问题描述

请认为我是 C# 的新手.扫描了大约 700 个帖子后，我决定再发一个问题:

Please consider that im a newcomer to c#. After scanning about 700 posts i decided to post one more question:

在我的 windows 窗体 (c#) 上，我有一些控件，包括文本框、复选框等.每当控件变为活动状态时，我都想更改背景色.我知道我可以为每个控件引发 'enter' 和 'leave' 事件以更改相应的属性，但应该有另一种方式.

On my windows form (c#) I have some controls including textboxes, checkboxes and so on. I want to change the backcolor whenever the controls become active. I know i could raise 'enter' and 'leave' events for each control to change the corresponding properties but there should be another way.

推荐答案

只需挂钩 Enter 和 Leave 事件 - 在每个事件中切换颜色.保存在 OnEnter 中保存的最后一个颜色以在 OnLeave

Simply hook Enter and Leave events - toggling the color in each. Save the last color saved in OnEnter to use in OnLeave

public Form1()
{
    InitializeComponent();

    var lastColorSaved = Color.Empty;

    foreach(Control child in this.Controls)
    {
        child.Enter += (s, e) =>
                            {
                                var control = (Control)s;
                                lastColorSaved = control.BackColor;
                                control.BackColor = Color.Red;
                            };
        child.Leave += (s, e) =>
                            {
                                ((Control)s).BackColor = lastColorSaved;
                            };
    }
}

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