您以什么方式使用除UI之外的委托和/或事件？

I am curious as to how other developers use delegates and/or events other than for responding to UI events? I, personally, don't use them for anything other than responding to UI events but I have a strong feeling that I am missing out on the power of delegates and events. So I pose this question to the SO community so that I may get some ideas on how I could possibly add these tools to my arsenal.I am curious as to how other developers use del