按钮单击更改面板颜色

Question

如何在button_click事件中更改面板颜色？下面是代码片段，我想在点击“清除”按钮时更改panel1的颜色。

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

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

Answer 1

什么阻止你这样做？

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，则需要添加事件TextChanged：

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

您案例中的面板将改变颜色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
}