单选按钮检查变更事件触发两次 [英] Radio button checked changed event fires twice

问题描述

请阅读我的问题，它不是一个重复的。

Please read my question its not a duplicate one.

我已经在Windows上形成了三个单选按钮，所有这些按钮有共同的CheckedChanged事件相关联。当我点击这些单选按钮时，会触发的CheckedChanged事件两次

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.

下面是我的代码：

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

我插这个事件迭代中断点和整个代码的两倍。
请告诉我为什么它的行为就像这样？

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

至于其他的回答者正确地说，在事件被触发两次，因为每当出现一个单选按钮组中被选中另一个将被取消选中 - 因此检查更改事件将触发两次

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.

要只能做此事件的单选按钮中的任何工作刚刚被选中，你可以看看发送对象，做这样的事情：

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);
        }
    }
}

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