c# - 如何在c#中禁用按钮颜色

Question

我有一组 5 个按钮，它们是我在 winforms 中使用 C# 创建的，如果我单击按钮 1，它应该变为绿色。然后如果单击按钮 2，它应该变为绿色。但是按钮 1 应该变为它的原色。

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {

            {
                button1.BackColor = Color.Green;
                button2.BackColor = Color.Lavender;
                button3.BackColor = Color.Lavender;
                button4.BackColor = Color.Lavender;
                button5.BackColor = Color.Lavender;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            button1.BackColor = Color.Lavender;
            button2.BackColor = Color.Green;
            button3.BackColor = Color.Lavender;
            button4.BackColor = Color.Lavender;
            button5.BackColor = Color.Lavender;
        }

        private void button3_Click(object sender, EventArgs e)
        {
            button1.BackColor = Color.Lavender;
            button2.BackColor = Color.Lavender;
            button3.BackColor = Color.Green;
            button4.BackColor = Color.Lavender;
            button5.BackColor = Color.Lavender;
        }
    }
}

但是如果我有很多按钮，这段代码会很忙。请帮我解决这个问题。

Answer 1

您可以创建一个事件处理程序并将其分配给所有按钮的 Click 事件:

private void ButtonClickHandler(object sender, EventArgs e)
{
    // iterate over all buttons on form
    foreach (var button in Controls.OfType<Button>())
        button.BackColor = button == sender ? Color.Green : Color.Lavender;
}

正如@CharlesMay 在评论中所述，请注意，此代码将找到作为您表单的直接子项的每个和任何 Button。有一些方法可以避免它:

<强>1。将按钮放在容器中。 例如，创建一个 Panel(比如 myPanel)并将所有这些按钮放在该面板上，然后迭代该面板的控件:

foreach (var button in myPanel.Controls.OfType<Button>())

<强>2。将您的事件按钮存储在私有(private)字段中。这样您根本不需要迭代控件:

private Button _activeButton = null;

private void ButtonClickHandler(object sender, EventArgs e)
{
    // disable previosly active button
    if (_activeButton != null) _activeButton.BackColor = Color.Lavender;
    // set new button
    _activeButton = sender as Button;
    // enable currently active button
    if (_activeButton != null) _activeButton.BackColor = Color.Green;
}