Introduction

阅读本书可逐步学习创建利用.NET 平台新功能的真实商业 Web 应用。读完后能使用 ADO.NET、Web Forms 和 Web Services 进行.NET 应用编程。本书采用逐步教学法,助读者更高效完成工作,投资回报从开篇章节即可体现。
The major benefit you will derive from reading this book is that you will be
led, step by step, through the creation of a real-world杝tyle business Web
application that takes advantage of many of the new capabilities provided
by the .NET platform. After reading this book, you will be able to program
.NET applications using ADO.NET, Web Forms, and Web Services. Most of the
books on the market do not address a real-world application, and most do
not ever use a step-by-step approach. This book uses this approach so you
can learn what you need in order to get your job done quicker and more
efficiently. This will make your investment in this book pay off right from
the beginning chapters.
### Aspect Oriented Programming (AOP) Introduction and Basic Principles #### Definition of AOP Aspect-Oriented Programming represents a programming paradigm that aims to increase modularity by allowing the separation of cross-cutting concerns. It creates a new way to think about program structure, beyond objects, procedures or functions. Cross-cutting concerns refer to behaviors that span multiple points in an application, such as logging, transaction management, security checks, caching mechanisms, etc.[^1] #### Core Concepts The core concepts within AOP include aspects, join points, pointcuts, advice, introductions, weaving, and interceptors. - **Aspects**: An aspect defines a particular concern affecting many parts of an application. - **Join Points**: These represent specific points during execution where additional behavior can be inserted—such as method calls, exception handling blocks, field access operations, etc. - **Pointcuts**: Pointcuts define precisely which join points should have extra functionality applied; they match one or more join points based on certain criteria defined through expressions. - **Advice**: Advice encapsulates actions taken around join points matched by associated pointcut definitions—it specifies what action needs performing before/after/before-and-after those moments occur. - **Introductions**: Introducing new methods or fields into existing classes without modifying their source code directly allows adding capabilities not originally present while maintaining original class integrity. - **Weaving**: Weaving refers to combining aspects with other pieces of software to create final woven programs ready for deployment. This process happens either statically at compile-time or dynamically at runtime depending upon implementation strategies chosen. - **Interceptors**: Interceptors act similarly to advices but operate specifically over service layer invocations often found inside enterprise applications built following layered architectures patterns like MVC. ```java @Aspect public class LoggingAspect { @Before("execution(* com.example.service.*.*(..))") public void logMethodEntry(JoinPoint joinPoint){ System.out.println("Entering Method : " + joinPoint.getSignature().getName()); } } ``` This example demonstrates how simple it becomes implementing logging across all services under `com.example.service` package using just few lines thanks to powerful features provided by frameworks supporting this approach natively such as Spring Framework's AOP module. --related questions-- 1. What are some common use cases for applying AOP? 2. How does AOP differ from OOP paradigms concerning design principles? 3. Can you provide examples illustrating different types of advice available in AOP implementations? 4. Explain the concept of 'weaving' in relation to AOP and its significance. 5. Discuss potential drawbacks or challenges faced when adopting AOP practices?
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