我在的的文章，但这里的总结，假设你是相当满意代表自己：

I've written this up in a fair amount of detail in an article, but here's the summary, assuming you're reasonably happy with delegates themselves:

• 的事件仅仅是一个增加的方法和删除的方法，以同样的方式，一个属性是实际上只是一个获取方法和集的方法。 （事实上​​，CLI允许一个升/火的方法为好，但C＃从来没有产生这个。）元数据描述了事件引用的方法。
• 在声明的 现场般的事件 的（如您ElementAddedEvent）编译器生成的方法的和（同类型的代表）的私人领域的。在类中，当您参考ElementAddedEvent你指到外地。在类外，你指到外地。
• 当有人赞同事件（与+ =运算符）调用add方法。当他们取消（使用 - =运算符）调用删除
。

• 有关字段的事件，有一些同步，但否则添加/删除只需调用委托。的联合 / 删除更改值自动生成的场。这两个操作都分配给支持字段 - 记住，代表是不可改变的。换句话说，自动生成的code是非常喜欢这样的：

• An event is just an "add" method and a "remove" method, in the same way that a property is really just a "get" method and a "set" method. (In fact, the CLI allows a "raise/fire" method as well, but C# never generates this.) Metadata describes the event with references to the methods.
• When you declare a field-like event (like your ElementAddedEvent) the compiler generates the methods and a private field (of the same type as the delegate). Within the class, when you refer to ElementAddedEvent you're referring to the field. Outside the class, you're referring to the field.
• When anyone subscribes to an event (with the += operator) that calls the add method. When they unsubscribe (with the -= operator) that calls the remove.

• For field-like events, there's some synchronization but otherwise the add/remove just call Delegate.Combine/Remove to change the value of the auto-generated field. Both of these operations assign to the backing field - remember that delegates are immutable. In other words, the autogenerated code is very much like this:

// Backing field
// The underscores just make it simpler to see what's going on here.
// In the rest of your source code for this class, if you refer to
// ElementAddedEvent, you're really referring to this field.
private EventHandler<EventArgs> __ElementAddedEvent;


// Actual event
public EventHandler<EventArgs> ElementAddedEvent
{
    add
    {
        lock(this)
        {
            // Equivalent to __ElementAddedEvent += value;
            __ElementAddedEvent = Delegate.Combine(__ElementAddedEvent, value);
        }
    }
    remove
    {
        lock(this)
        {
            // Equivalent to __ElementAddedEvent -= value;
            __ElementAddedEvent = Delegate.Remove(__ElementAddedEvent, value);
        }
    }
}

public EventHandler<EventArgs> ElementAddedEvent = delegate {};