AOP之PostSharp6-EventInterceptionAspect(事件异步调用)
2011-12-13 19:50 破狼 阅读(2246) 评论(1) 编辑 收藏 举报在上几章我们讨论了方法属性字段的aspect,现在我们再来看看事件机制的aspect。和字段,属性location一样,在c#中字段也可以转化为方法名为add,remove的方法处理,所以对于事件的aspect,同样类似于我们的方法。我们先看看EventInterceptionAspect的定义:
aspect类包含我们对于事件aspect所必要的注册,取消,调用的注入。
其参数定义如下:
为我们提供了,ProceedAddHandler,ProceedInvokeHandler,ProceedRemoveHandler的事件处理代理。同样包含来自AdviceArgs的Instance对象。
对于事件aspect的例子真的不好想,在这里我们只是简单的做个事件变为异步调用的代码作为demo:
[Serializable]
public class AsynEventAspectAttribute : PostSharp.Aspects.EventInterceptionAspect
{
public override void OnInvokeHandler(PostSharp.Aspects.EventInterceptionArgs args)
{
var th = new System.Threading.Thread(new System.Threading.ParameterizedThreadStart(new Action<object>((obj) =>
{
System.Threading.Thread.Sleep(new Random().Next(1000));
try
{
args.ProceedInvokeHandler();
}
catch (Exception ex)
{
args.ProceedRemoveHandler();
}
})));
th.Start();
}
}
public class AsynEventAspectAttribute : PostSharp.Aspects.EventInterceptionAspect
{
public override void OnInvokeHandler(PostSharp.Aspects.EventInterceptionArgs args)
{
var th = new System.Threading.Thread(new System.Threading.ParameterizedThreadStart(new Action<object>((obj) =>
{
System.Threading.Thread.Sleep(new Random().Next(1000));
try
{
args.ProceedInvokeHandler();
}
catch (Exception ex)
{
args.ProceedRemoveHandler();
}
})));
th.Start();
}
}
测试代码:
namespace PostSharpDemo
{
public class TestAsyncAspect
{
[AsynEventAspectAttribute]
public event EventHandler SomeEvent = null;
public void OnSomeEvent()
{
if (SomeEvent != null)
{
SomeEvent(this, EventArgs.Empty);
}
}
}
}
{
public class TestAsyncAspect
{
[AsynEventAspectAttribute]
public event EventHandler SomeEvent = null;
public void OnSomeEvent()
{
if (SomeEvent != null)
{
SomeEvent(this, EventArgs.Empty);
}
}
}
}
class Program
{
static void Main(string[] args)
{
TestAsyncAspect pro = new TestAsyncAspect();
for (int i = 0; i < 10; i++)
{
pro.SomeEvent += new EventHandler(pro_SomeEvent);
}
pro.OnSomeEvent();
// pro.SomeEvent -= new EventHandler(pro_SomeEvent);
Console.WriteLine("主线程完了!");
Console.Read();
}
static void pro_SomeEvent(object sender, EventArgs e)
{
Console.WriteLine(System.Threading.Thread.CurrentThread.ManagedThreadId);
}
}
{
static void Main(string[] args)
{
TestAsyncAspect pro = new TestAsyncAspect();
for (int i = 0; i < 10; i++)
{
pro.SomeEvent += new EventHandler(pro_SomeEvent);
}
pro.OnSomeEvent();
// pro.SomeEvent -= new EventHandler(pro_SomeEvent);
Console.WriteLine("主线程完了!");
Console.Read();
}
static void pro_SomeEvent(object sender, EventArgs e)
{
Console.WriteLine(System.Threading.Thread.CurrentThread.ManagedThreadId);
}
}
效果图如下:
附件下载:demo
作者:破 狼
出处:http://www.cnblogs.com/whitewolf/
本文版权归作者,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接,否则保留追究法律责任的权利。该文章也同时发布在我的独立博客中-个人独立博客、博客园--破狼和51CTO--破狼。