大量控件类似事件能否批量添加，如何快速实现或者如何判断要执行的是哪个控件

Question

一个界面大概有一个flowLayoutPanel，其中flowLayoutPanel中放了大概50个Label控件，每个空间都要执行以下代码：

private void Label1_MouseEnter(object sender, EventArgs e)
{
    Label1.BackColor = Color.Blue;
}

private void Label1_MouseLeave(object sender, EventArgs e)
{
    Label1.BackColor = Color.Transparent;
}

如果50个Label一一添加以上两个事件，显得非常麻烦，代码也很长，请教大师们，有没有什么办法可以较为简单实现？比如说鼠标移入flowLayoutPanel，然后判断鼠标移入的是哪个label，然后执行这个Label的BackColor为Blue；移出flowLayoutPanel则时所有BackColor为Transparent。请高手赐教，谢谢！

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努力~

Answer 1

Hi,

Try this,

private void Form1_Load(object sender, EventArgs e)
{
	foreach (var labelItem in flowLayoutPanel1.Controls.OfType<Label>())
	{
		labelItem.MouseEnter += Label1_MouseEnter;
		labelItem.MouseLeave += Label1_MouseLeave;
	}
}

private void Label1_MouseEnter(object sender, EventArgs e)
{
	var labelItem = sender as Label;
	if(labelItem !=null)
		labelItem.BackColor = Color.Blue;
}

private void Label1_MouseLeave(object sender, EventArgs e)
{
	var labelItem = sender as Label;
	if (labelItem != null)
		labelItem.BackColor = Color.Transparent;
}

 

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亂馬客blog: http://www.dotblogs.com.tw/rainmaker/

Answer 2

Hi,

Try this,

private void Form1_Load(object sender, EventArgs e)
{
	foreach (var labelItem in flowLayoutPanel1.Controls.OfType<Label>())
	{
		labelItem.MouseEnter += Label1_MouseEnter;
		labelItem.MouseLeave += Label1_MouseLeave;
	}
}

private void Label1_MouseEnter(object sender, EventArgs e)
{
	var labelItem = sender as Label;
	if(labelItem !=null)
		labelItem.BackColor = Color.Blue;
}

private void Label1_MouseLeave(object sender, EventArgs e)
{
	var labelItem = sender as Label;
	if (labelItem != null)
		labelItem.BackColor = Color.Transparent;
}

 

---

亂馬客blog: http://www.dotblogs.com.tw/rainmaker/

非常感謝亂馬客大師！很好的答案，幫了大忙了。我經常看你的blog，都寫得很好，都是我學習的材料。再次感謝！

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努力~

Answer 3

Hi zjyh16,

    請別客氣，請多多上來論壇跟大伙一起討論，^_^!

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亂馬客blog: http://www.dotblogs.com.tw/rainmaker/