单击按钮即可更改面板颜色

Question

如何在button_click事件上更改面板颜色？ 下面是代码段，当我单击清除按钮时，我想更改panel1颜色。

private void buttClear_Click(object sender, EventArgs e)
{       
     txtPntX.Text = "";
     txtPntY.Text = "";

     txtSrtPtX.Text = "";
     txtSrtPtY.Text = "";
     txtEndPtX.Text = "";
     txtEndPtY.Text = "";
}

Answer 1

是什么让您无法这样做？

panel1.BackColor = Colors.Red;

Answer 2

如果您想在每次txtSrtPtX文本框文本更改时更改颜色，则需要添加一个事件TextChanged ：

private void txtSrtPtX_TextChanged(object sender, EventArgs e)
{
      panel1.BackColor = Color.Red;
}

您所用面板的颜色将更改6次：

private void buttClear_Click(object sender, EventArgs e)
{       
     txtPntX.Text = ""; //1
     txtPntY.Text = ""; //2    
     txtSrtPtX.Text = ""; //3
     txtSrtPtY.Text = ""; //4 
     txtEndPtX.Text = ""; //5
     txtEndPtY.Text = ""; //6
}

Answer 3

为什么不只使用：

private void buttClear_Click(object sender, EventArgs e)
{       
     txtPntX.Text = "";
     txtPntY.Text = "";
     txtSrtPtX.Text = "";
     txtSrtPtY.Text = "";
     txtEndPtX.Text = "";
     txtEndPtY.Text = "";
     panel1.BackColor = Color.Red; // < This one
}