EventBus实现、发布订阅及XML加载

EventBus实现、发布订阅及XML加载2014-06-19 cnblogs Aaron受到CQRS的影响，写了个EventBus，能实现发布订阅模式执行event，在DDD模型中，可以使用如下代码触发事件：

EventBus bus = EventBus.Instance（）;
bus.Publish（new OrderAddedEvent（））;

解决方案结构图如下，很简单易懂：

xml事件配置代码sample如下（1个event可以定义多个订阅者，如下）：

<？xml version="1.0" encoding="utf-8" ？><Events><Event><PublishEvent>ConsoleApplication2.code.Events.OrderAddedEvent</PublishEvent><SubscribedEvents><SubscribedEvent>ConsoleApplication2.code.EventHandlers.OrderAddedEventHandler_CachePrepare</SubscribedEvent><SubscribedEvent>ConsoleApplication2.code.EventHandlers.OrderAddedEventHandler_PDFGenerate</SubscribedEvent></SubscribedEvents></Event><Event><PublishEvent>ConsoleApplication2.code.Events.OrderDeletedEvent&lt;/PublishEvent><SubscribedEvents><SubscribedEvent>ConsoleApplication2.code.EventHandlers.OrderDeletedEventHandler_NotifyClient</SubscribedEvent><SubscribedEvent>ConsoleApplication2.code.EventHandlers.OrderDeletedEventHandler_RemovCache</SubscribedEvent></SubscribedEvents></Event></Events>

我们先来定义Event：

public class BaseEvent //空的，不需要实现其他方法{}public class OrderAddedEvent : BaseEvent//订单已经加入，触发的event{}public class OrderDeletedEvent : BaseEvent //订单已经删除，触发的event{public Guid OrderId { get; set; }public OrderDeletedEvent（Guid orderId）{this.OrderId = orderId;}}

定义事件的处理程序：

public interface IEventHandler<T>where T : BaseEvent{void Handle（T evt）;}public class OrderDeletedEventHandler_NotifyClient : IEventHandler<OrderDeletedEvent>{public void Handle（OrderDeletedEvent evt）{Console.WriteLine（"[Order deleted] Notified."）;}}