在C#中,委托和事件是用于实现事件驱动编程的重要工具。它们可以帮助我们更好地组织和管理代码,提高代码的可读性和可维护性。以下是一些建议,可以帮助你优化C#中的委托和事件代码结构:
Delegate
关键字。这样可以提高代码的可读性和类型安全性。例如,定义一个强类型委托,用于处理特定类型的事件:public delegate void MyEventHandler(object sender, MyEventArgs e);
public event MyEventHandler MyEvent;
public class EventPublisher
{
public event MyEventHandler MyEvent;
protected virtual void OnMyEvent(MyEventArgs e)
{
MyEvent?.Invoke(this, e);
}
}
public class EventSubscriber
{
public EventSubscriber(EventPublisher publisher)
{
publisher.MyEvent += OnMyEvent;
}
private void OnMyEvent(object sender, MyEventArgs e)
{
// 处理事件逻辑
}
}
public class EventPublisher
{
private readonly WeakEventSubscription<MyEventHandler> _myEventSubscription;
public event MyEventHandler MyEvent;
public EventPublisher(EventSubscriber subscriber)
{
_myEventSubscription = new WeakEventSubscription<MyEventHandler>(subscriber, OnMyEvent);
}
protected virtual void OnMyEvent(object sender, MyEventArgs e)
{
MyEvent?.Invoke(this, e);
}
}
public class WeakEventSubscription<TEventHandler> where TEventHandler : Delegate
{
private readonly WeakReference _handlerReference;
private readonly Action<object, TEventArgs> _eventHandler;
public WeakEventSubscription(EventSubscriber subscriber, Action<object, TEventArgs> eventHandler)
{
_handlerReference = new WeakReference(subscriber);
_eventHandler = eventHandler;
}
public void Remove()
{
var handler = _handlerReference.Target as EventSubscriber;
if (handler != null)
{
((EventPublisher)handler._publisher).MyEvent -= _eventHandler;
}
}
}
public delegate TEventArgs EventHandler<TEventArgs>(object sender, TEventArgs e);
public event EventHandler<MyEventArgs> MyEvent;
遵循以上建议,可以帮助你优化C#中的委托和事件代码结构,提高代码的可读性和可维护性。