当从内存释放服务器控件时发生，这是请求 ASP.NET 页时服务器控件生存期的最后阶段。Occurs when a server control is released from memory, which is the last stage of the server control lifecycle when an ASP.NET page is requested.
public: virtual event EventHandler ^ Disposed;
public event EventHandler Disposed;
member this.Disposed : EventHandler
Public Custom Event Disposed As EventHandler
需要大量处理器时间的资源（例如数据库连接）应随此事件一起发布。Resources that require significant processor time, such as database connections, should be released with this event.