public static event EventHandler <MyArgEventsArgs> Counted2; // 使用泛型好处：不需要强转类型了
public void DoCount()
{
MyArgEventsArgs args = new MyArgEventsArgs();
args.Value = 9;
Counted?.Invoke(this, args); // this:表示调用本方法的实例对象
Counted2?.Invoke(this, args);
}
private void Count(object source, EventArgs e)
{
MyArgEventsArgs args = (MyArgEventsArgs)e;
Console.WriteLine(args.Value);
}
private void Count2(object sender, MyArgEventsArgs e)
{
Console.WriteLine(e.Value);
}
