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[英]C# How to prevent the event handler assigned to multiple controls being called twice?
[英]How make one event handler that applies to multiple controls in C#?
在 Visual Basic 中,我知道该怎么做,但是我是 C# 新手,所以你们能告诉我如何使用鼠标悬停将同一事件应用于多个控件的“私有无效”吗? 有一个例子:
private void button1, button2, button3, button4_MouseHover(object sender, EventArgs e)
{
btn.Image = pic
}
只需声明一个事件处理程序并将每个按钮指向它:
private void Common_MouseHover(object sender, EventArgs e)
{
Button btn = sender as Button;
if (btn != null)
btn.Image = pic
}
然后在代码或设计器中:
button1.MouseHover += Common_MouseHover;
button2.MouseHover += Common_MouseHover;
// .. etc
当您订阅按钮上的事件时,它只是一个标准的事件处理程序:
button1.Click += myEventHandler;
您可以使用相同的代码为每个按钮添加处理程序:
button1.Click += myEventHandler;
button2.Click += myEventHandler;
button3.Click += myEventHandler;
button4.Click += myEventHandler;
button5.Click += myEventHandler;
button6.Click += myEventHandler;
button1.MouseOver += OnMouseOver(...)
button2.MouseOver += OnMouseOver(...)
button3.MouseOver += OnMouseOver(...)
button4.MouseOver += OnMouseOver(...)
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