NET框架下的AOP技术研究与实现

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"这篇研究论文探讨了在.NET框架中应用面向切面编程（AOP）技术的理论和实践。作者通过介绍AOP的概念及其在.NET框架中的技术特点，深入分析了AOP在.NET中的实现机制，并提出了一种在.NET框架内实现AOP框架的方法，同时还给出了相应的示例来说明其应用。关键词包括：AOP、.NET、元数据、属性和代理。" .NET框架中的AOP技术是面向对象编程（OOP）的一个补充，旨在将软件开发中的核心业务逻辑与通用支持服务分离。OOP通过封装、继承和多态性创建了对象层次结构，模拟了一系列共同行为。然而，当需要向分布式对象添加通用行为时，问题就显现出来了。AOP的引入就是为了应对这一挑战，它允许开发者将关注点分离，如日志、事务管理等横切关注点，从主业务逻辑中解耦出来。 .NET框架提供了对AOP支持的基础，其中包括元数据和属性等特性。元数据是.NET中的一种关键机制，它允许在代码中嵌入附加信息，这些信息可以用于反射和其他形式的运行时处理。属性则是一种声明式编程元素，可以在类型、方法或字段上附加自定义信息，这些信息在运行时可以通过反射访问，这在实现AOP代理时非常有用。 AOP在.NET中的实现通常涉及代理模式。代理可以是动态的或静态的，它们作为原始对象的外壳，拦截调用并在调用前后执行额外的行为。例如，动态代理（如System.Reflection.Emit或Castle.DynamicProxy库）能够在运行时创建代理类，而静态代理则是在编译时创建。这两种方法都可以用来注入横切关注点，如在方法调用前后添加日志记录或事务管理代码。论文的作者们提出了一个在.NET框架内实现AOP框架的方法，这个框架可能包括以下组成部分： 1. **切面定义**：定义关注点以及它们如何与程序的特定点（即连接点）关联。这通常通过使用属性或配置文件来完成。 2. **织入**：将切面逻辑插入到目标对象的生命周期中。这可能发生在编译时、加载时或运行时。 3. **通知**：实际执行的切面逻辑，如前置通知（Before）、后置通知（After）、环绕通知（Around）等。 4. **代理生成**：根据切面和连接点信息，生成能够拦截并处理通知的代理对象。通过这种方式，开发者可以在不修改原有业务代码的情况下，轻松地添加、修改或移除横切关注点，提高了代码的可维护性和复用性。论文最后会给出一个具体的示例，展示如何使用上述AOP框架来实现一个简单的功能，如在方法执行前后添加日志记录。这个示例有助于读者理解AOP在.NET中的实际运用，以及如何利用.NET的特性来实现AOP框架。这篇研究论文深入探讨了.NET框架下的AOP技术，提供了一种实现AOP框架的途径，并通过实例展示了其工作原理，对于理解AOP在实际开发中的应用具有重要价值。

Research And Implementation Of AOP Technology In .NET Framework

Weng Wen

Shanghai Second Polytechnic University

Shanghai, China

E-mail: wengwen@sspu.edu.cn

Shiming Zhang

Shanghai Second Polytechnic University

Shanghai, China

E-mail: smzhang@sspu.edu.cn

Abstract—Aspect-Oriented Programming is the supplement

with OOP, which separate the core business logic from general

supported service in software development. The concepts of

AOP and the technology characteristics of .NET framework

are introduced, then this paper analyzed the implement

mechanism of AOP in .NET framework, finally an approach to

implement AOP Framework in .NET framework and a

corresponding example to demonstrate it are given

．

Keywords-AOP;.NET;Metadata;Attribute;Proxy

I. INTRODUCTION

The design of computer software still use the mode of

OOP (Object-Oriented programming) mostly, OOP created

an object hierarchy structure by introducing packaging

inheritance and polymorphism ,simulated a set of the

common behavior. The problem is exposed when adding a

common behavior to the distributed object. It allows to

define the relationship from top to bottom, but not for the

relationship defined from left to right. For instance, log

function, transaction, performance monitor .etc. The code of

these functions always cut through more modules,

distributed horizontally the structure of all objects, totally

irrelevant to the core function of these objects. These

irrelevant code are called cross-cutting code [1].In OOP

mode, the cross-cutting code lead to a lot of code duplication

and tightly-coupled.

The problem can be resolved by Aspect-Oriented

Programming .The concept of cross-cutting concerns is

proposed. The developer can provide the program better

packaging and interoperability by using it. The core idea of

AOP is “separated the business logic from the non functional

logic in program” [2].

This paper introduced the concepts of AOP, then

analyzed the realization mechanism of AOP in .NET

framework, finally an approach to implement AOP

Framework in .NET framework and a corresponding

example to demonstrate it are given．

II. Basic conception of AOP

The concepts of AOP are presented at the end of 90s last

century. It is a good programming model invented by Xerox

PARC.A new programming proposed by analyzing the

limitation of object - oriented programming that will help

maximize code reuse and improve the efficiency of the

development process[3]. With software systems become

more complex, large-scaled software system and enterprise

applications increasingly require to separate core businesses

code and common services code[4]. The technology of AOP

separate the common services by crosscutting concerns code

and form a unified functional architecture.

AOP allows developers to dynamically modify the static

OO model. A new system is established which grows up to

meet the demand of newly added. That is, the system could

have new features in actual application[5].

Using a technique called “cross-cutting”, dissect the

internal of object. By encapsulating them in an independent

module called “aspect”[6]. The so-called aspect what

doesn’t concern the business, called by all the business logic

module , for instance, transaction process, log management,

authority control, etc[7]. It encapsulates them, help reduce

the code duplication and reduce the coupling between

modules and be of high practical and maintainability. It is

shown in Fig.1.

Figure 1 .the longitudinal and the cross aspects of application

III. THE REALIZATION TECHNOLOGY OF THE AOP

The realization technology of the AOP is mainly divided

into two major methods. One is dynamic agent technology. It

decorated the message by intercepting it to replace the

implementation of original object’s behavior; The other is

static weaving, it created “aspect” by specific syntax,

compiler can be woven into the related code of the "aspects"

2014 Second International Conference on Enterprise Systems

DOI 10.1109/ES.2014.49

2014 Second International Conference on Enterprise Systems

DOI 10.1109/ES.2014.49

2014 Second International Conference on Enterprise Systems

DOI 10.1109/ES.2014.49

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