C# Asp.net中的AOP框架 Microsoft.CCI， Mono.Cecil， Typemock Open-AOP API， PostSharp -摘自网络 （可以利用反射 Attribute 进行面向切面编程 可以用在记录整个方法的Log方面）

Both Microsoft.CCI and Mono.Cecil are low-level, and don't validate produced assemblies. It takes lots of time to find the reason of problem, if there is any error in generated code or assembly structure.
I'd recommend using PostSharp if it's features are enough for you tasks.
Otherwise... Mono.Cecil has better, more understandable and easy in use object model. However, I had an ugly bug when used it in my program (reference to the wrong method was saved in the assembly; I think there was some bug with metadata tokens handling)
Microsoft.CCI has an ugly, utterly over-designed object model in the same time lacking many simple features; however, it's more mature than Mono.Cecil. Finally, I abandoned Mono.Cecil and used Microsoft.CCI for my program.

Typemock Open-AOP API
http://cthru.codeplex.com/wikipage?title=Typemock%20Open-AOP%20API