如何将事件处理程序添加到泛型类型 T 的静态类事件？

Question

This one's a bit esoteric.

Consider the following code:

class MyObject {
  public static event EventHandler SomeEvent;
}

class Container<T> {
  public Container() {
    T.SomeEvent += OnSomeEvent;   // will not compile
  }
  void OnSomeEvent(object sender, object eventArgs) { }
}

Container<MyObject> foo;

Of course this will not compile, because the compiler doesn't know the type of T at compile time. More specifically, it doesn't know for certain that it has the event in question.

How do I attach an event handler to a static event SomeEvent of template parameter T ? Do I need to do messy reflection?

Answer 1

Yes, you would need to use reflection here - and it will be messy. I would also suggest using Type instead of <T> here, as static class etc can't be used with <T> , which could limit the usage. However, as a general rule: you should actively minimize static events anyway (they're a great way to cause memory leaks, and are hard to isolate), so it might be preferable to use an alternative design altogether.