我有
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()
{
}
??
}
A类有一个B类实例。
如何做到这一点?
答案 0 :(得分:44)
您需要在“B”类声明一个公共事件 - 并让“A”类订阅它:
这样的事情:
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
}
....
答案 1 :(得分:6)
你需要三件事(在代码中用注释标记):
代码:
class A
{
B b;
public A(B b)
{
this.b = b;
// subscribe to event
b.SomethingHappened += MyMethod;
}
private void MyMethod() { }
}
class B
{
// declare event
public event Action SomethingHappened;
private void Button_Click(object o, EventArgs s)
{
// raise event
if (SomethingHappened != null)
SomethingHappened();
SomeMethod();
}
public void SomeMethod() { }
}
答案 2 :(得分:0)