用.net4中的DynamicObject实现简单AOP
public class DynamicWrapper : DynamicObject
{
private readonly object source;
public DynamicWrapper(object source)
{
this.source = source;
}
public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)
{
var methodInfo = source.GetType().GetMethod(binder.Name);
if (methodInfo != null)
{
Func<object, object[], object> func = (s, a) => methodInfo.Invoke(s, a);
result = MethodCall(func, source, args);
return true;
}
result = null;
return false;
}
protected virtual object MethodCall(Func<object, object[], object> func, object src, object[] args)
{
return func(src, args);
}
}
public class TryCatchDynamicWrapper : DynamicWrapper
{
public TryCatchDynamicWrapper(object source)
: base(source)
{ }
protected override object MethodCall(Func<object, object[], object> func, object src, object[] args)
{
try
{
return base.MethodCall(func, src, args);
}
catch (Exception ex)
{
Console.WriteLine(ex);
throw;
}
}
}
码是这样的，这里我们增一个扩展方法，这样使我们的代码更加简洁，您会在后面的Unit Test中看到：
1: public interface ITestObject
2: {
3: int Div(int num1, int num2);
4: }
5:
6: public class TestObject : ITestObject
7: {
8:
9: #region ITestObject Members
10:
11: public int Div(int num1,int num2)
12: {
13: return num1 / num2;
14: }
15:
16: #endregion
17:
18: public ITestObject WrapDynamicConsoleLogging
19: {
20: get
21: {
22: return this.WithMethodConsoleLogging();
23: }
24: }
25: }
26:
27: public static class Extenstions
28: {
29: public static dynamic WithMethodConsoleLogging(this ITestObject testobject)
30: {
31: return new DynamicLoggingWrapper(Activator.CreateInstance<TestObject>(), ConsoleLogger.Instance);
32: }
33:
34: public static dynamic WrapWith<T>(this ITestObject testobject) where T : DynamicWrapper
35: {
36: return Activator.CreateInstance(typeof(T), new object[] { Activator.CreateInstance<TestObject>() });
37: }
38: }
Unit Test，如何使用呢：
1: [Test]
2: [ExpectedException(typeof(TargetInvocationException))]
3: public void TestTryCatchDynamicWrapper()
4: {
5: dynamic proxy = new TryCatchDynamicWrapper(new TestObject());
6: var ll = proxy.Div(6, 0);
7: }
8:
http://www.cnblogs.com/wintersun/archive/2011/06/19/2084755.html
