利用.NET4.0的DynamicObject来拦截调用实现AOP
利用AOP我们很容易的就能实现类似Log等业务无关的横切关注点,避免了这些代码在项目中不断的重复,利用.NET DLR 我们可以很容易的就实现一个简单的AOP,代码如下:
using System;
using System.Dynamic;
using System.Reflection;
namespace Zxf.Practices
{
public class DynamicProxy : DynamicObject
{
Object m_Object;
public DynamicProxy(Object obj)
{
m_Object = obj;
}
public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)
{
try
{
Console.WriteLine("Begin: " + binder.Name);
result = m_Object.GetType().InvokeMember(binder.Name, BindingFlags.InvokeMethod, null, m_Object, args);
Console.WriteLine("end: " + binder.Name);
return true;
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
throw;
}
}
}
}
我们可以在项目中这样使用这个AOP类:
using System;
using Zxf.Practices;
class Program
{
static void Main(string[] args)
{
dynamic proxy = new DynamicProxy(new TestClass());
proxy.test();
}
}
public class TestClass
{
public void test()
{
throw new Exception("test");
}
}