本文介绍了当另一个类的事件被触发时通知的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
I have
class A
{
B b;
//call this Method when b.Button_click or b.someMethod is launched
private void MyMethod()
{
}
??
}
Class B
{
//here i.e. a button is pressed and in Class A
//i want to call also MyMethod() in Class A after the button is pressed
private void Button_Click(object o, EventArgs s)
{
SomeMethod();
}
public void SomeMethod()
{
}
??
}
Class A has a instance of Class B.
How can this be done?
解决方案
You'll need to declare a public event on class 'B' - and have class 'A' subscribe to it:
Something like this:
class B
{
//A public event for listeners to subscribe to
public event EventHandler SomethingHappened;
private void Button_Click(object o, EventArgs s)
{
//Fire the event - notifying all subscribers
if(SomethingHappened != null)
SomethingHappened(this, null);
}
....
class A
{
//Where B is used - subscribe to it's public event
public A()
{
B objectToSubscribeTo = new B();
objectToSubscribeTo.SomethingHappened += HandleSomethingHappening;
}
public void HandleSomethingHappening(object sender, EventArgs e)
{
//Do something here
}
....
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