由网友(孽心@)分享简介：请阅读我的问题，它不是重复的.Please read my question its not a duplicate one.我在 Windows 窗体上有三个单选按钮，所有这些按钮都关联了共同的CheckedChanged"事件.当我单击这些单选按钮中的任何一个时，它会触发两次CheckedChanged"事件....

请阅读我的问题，它不是重复的.

Please read my question its not a duplicate one.

我在 Windows 窗体上有三个单选按钮，所有这些按钮都关联了共同的CheckedChanged"事件.当我单击这些单选按钮中的任何一个时，它会触发两次CheckedChanged"事件.

I've three radio buttons on windows form and all these buttons have common 'CheckedChanged' event associated. When I click any of these radio buttons, it triggers the 'CheckedChanged' event twice.

这是我的代码:

private void radioButtons_CheckedChanged(object sender, EventArgs e)
{
    //My Code
}

我插入了断点，并且此事件中的整个代码迭代了两次.请告诉我为什么会这样?

I inserted the breakpoint and the whole code within this event iterates twice. Please tell me why it is behaving like this?

推荐答案

作为另一个答案正确说明，事件被解雇了两次，因为每当一个组内的一个radiobutton被检查另一个，都将取消选中 - 因此，被检查的更改的事件将触发两次.

As the other answerers rightly say, the event is fired twice because whenever one RadioButton within a group is checked another will be unchecked - therefore the checked changed event will fire twice.

要仅在此事件中为刚刚被选中的 RadioButton 执行任何工作，您可以查看 sender 对象，执行以下操作:

To only do any work within this event for the RadioButton which has just been selected you can look at the sender object, doing something like this:

void radioButtons_CheckedChanged(object sender, EventArgs e)
{
    RadioButton rb = sender as RadioButton;
    if (rb != null)
    {
        if (rb.Checked)
        {
            // Only one radio button will be checked
            Console.WriteLine("Changed: " + rb.Name);
        }
    }
}