ASP.NET 2.0与AJAX实战指南

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"Learning ASP.NET 2.0 with AJAX A Practical Hands-on Guide.pdf" 该资源是一本实践导向的指南，旨在帮助读者深入理解如何在ASP.NET 2.0框架下使用AJAX技术。ASP.NET 2.0是微软推出的一个强大的Web应用程序开发平台，它提供了丰富的工具和功能，使得开发者可以更高效地构建动态、交互性强的网站。AJAX（Asynchronous JavaScript and XML）则是一种用于创建更快、更互动的Web应用的技术，它允许部分网页更新而无需重新加载整个页面，极大地提升了用户体验。书中可能涵盖了以下几个关键知识点： 1. **ASP.NET 2.0基础**：首先，读者将了解ASP.NET 2.0的核心概念，包括控件模型、页面生命周期、状态管理以及如何利用Visual Studio 2005等开发工具进行开发。 2. **AJAX概述**：介绍AJAX的工作原理，包括XMLHttpRequest对象、JavaScript异步调用、以及JSON（JavaScript Object Notation）数据格式在AJAX中的应用。 3. **ASP.NET AJAX扩展**：微软在ASP.NET 2.0中引入了Atlas（后来成为ASP.NET AJAX Control Toolkit），提供了一系列的服务器端控件和客户端库，简化了在ASP.NET中实现AJAX功能的过程。 4. **UpdatePanel与ScriptManager**：这两个组件是ASP.NET AJAX的核心组成部分，UpdatePanel允许开发者以无刷新方式更新页面的一部分，而ScriptManager则是协调服务器端和客户端AJAX脚本的中心点。 5. **AJAX与Web Services**：如何使用ASP.NET的Web服务（ASMX或WCF）与AJAX配合，实现跨域数据通信，以及如何通过AJAX调用这些服务以获取或发送数据。 6. **优化与性能**：讨论如何有效地使用AJAX以避免潜在的性能问题，如减少HTTP请求、优化JavaScript代码和处理页面加载时间等。 7. **实战项目**：书中的实践部分可能包含多个逐步指导的实例，帮助读者将学到的知识应用于实际项目，提升技能。 8. **调试与错误处理**：如何使用开发工具进行AJAX应用的调试，以及处理可能出现的客户端和服务器端错误。 9. **相关资源**：作者可能还会推荐其他相关的.NET技术和书籍，如ASP.NET Cookbook、Essential Silverlight、Learning JavaScript等，以扩展读者的知识面。 10. **O'Reilly资源**：O'Reilly出版社为.NET开发者提供了丰富的在线资源，包括样章、代码示例、会议信息和Safari Bookshelf在线参考图书馆，这些都是进一步学习和提升的好去处。通过本书的学习，读者不仅可以掌握ASP.NET 2.0与AJAX的结合使用，还能了解到如何利用这些技术来构建高性能、用户友好的Web应用。

Preface1

ASP.NET 2.0 with AJAX is arguably the fastest, most efficient, most reliable and best

supported way to create interactive web applications available today. Combined with

the development tools available from Microsoft, both free and commercial, it is

incredibly easy to create web sites that look great and perform well. Best of all, most

of the “plumbing” (security, data access, layout, and so on) is taken care of for you

by the .NET Framework.

About This Book

This book will teach you how to build professional quality, interactive, robust data-

driven web applications using Visual Basic 2005. In addition, your applications will

be highly interactive and data driven—must-have features in today’s feature-rich web

world.

ASP.NET is not difficult. All of the concepts are straightforward, and the Visual Stu-

dio and Visual Web Developer environments simplify the process of building power-

ful web applications. The difficulty in ASP.NET is only that it is so complete and

flexible that there are many pieces that must be woven together to build a robust,

scalable, and efficient application. This book cuts to the heart of the matter, show-

ing in clear, easy-to-follow steps, how to understand and build a web site.

Because there are three authors’ names on this book, you might be concerned that

the tone will be uneven. Every possible measure has been taken to avoid this.

Although each chapter was originally written by one author, they were edited by all

three. Every chapter was then extensively edited and rewritten by me, Jesse Liberty,

to give the book a single voice. If that weren’t enough, the chapters were subse-

quently edited by O’Reilly editors as well as independent tech editors, and once

more by the authors. The bottom line is that while three individuals wrote this book,

you should find it reads as if written by just one. This system has worked well with

my previous books. If not, please be sure to let me know by dropping a note in my

support forum (http://forums.delphiforums.com/JesseLiberty).

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xvi

Preface

About This Series

O’Reilly Learning books are written and designed for anyone who wants to build

new skills and who prefers a structured approach to studying. Each title in this series

makes use of learning principles that we (with your help) have found to be best at

equipping you with the knowledge you need for joining that new project, for coping

with that unexpected assignment from your manager, or for learning a new language

in a hurry.

To get the most out of any book in the Learning series, we recommend you work

your way through each chapter in sequence. You’ll find that you can get a quick

grasp of a chapter’s content by reading the instructional captions we’ve written for

its examples and figures. You can also use the chapter Summary to preview its key

takeaways and to review what you have learned. Most chapters feature a sample

application, and, if you learn best by reading code, you can turn to the complete

source listing that appears just before the Summary. To bridge any gaps in your

knowledge, check out the Cheat Sheets. Finally, to help you test your mastery of the

material in each chapter, we conclude with a Brain Builder section, which includes a

short quiz and some hands-on exercises.

Learning books work with you as you learn—much as you would expect from a

trusted colleague or instructor—and we strive to make your learning experience

enjoyable. Tell us how we’ve done by sending us praise, brickbats, or suggestions for

improvements to learning@oreilly.com.

Learning or Programming?

We have written two ASP.NET books: the one you are currently reading and another

named Programming ASP.NET 2.0. This book, Learning ASP.NET 2.0 with AJAX is

intended for beginning ASP.NET developers, and answers the question: “What is the

quickest way for me to build real web applications with the least handcoding?”

Our other book, Programming ASP.NET is for developers who are saying: “Help me

learn—in depth; show how everything works, and then help me put it to work in

web applications.” The key difference is this book is aimed to make you productive

quickly, while the second book is designed to explore the technology in detail. They

complement each other, but if you are starting out and want to get to work fast, this

is the one for you.

Learning ASP.NET 2.0 with Ajax assumes you know some HTML and have either

some familiarity with Visual Basic 2005 (VB) or C#, or can pick up what you need

along the way. (Or you’re willing to run right out and buy Programming Visual Basic

2005 by Jesse Liberty, although for what you’ll be doing here, you won’t really need

it). To help with this, we have included VB Cheat Sheets throughout the book to

explain and clarify some of the VB topics for newbies.

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Preface

xvii

VB Versus C#

A quick note on Visual Basic versus C#: Some people choose a .NET book based on

what language the examples are given in. That’s a natural reaction, but it’s really not

necessary, and here’s why: There is very little actual VB or C# code in any given

ASP.NET program, and what there is, you can easily translate from one to the other

“on inspection.” Besides, the two languages are strikingly similar. If you know one,

it’s quite simple to learn the other. In fact, there are software tools that can convert

one language to the other with amazing accuracy. Finally, ASP.NET programmers

benefit terrifically by being “bilingual”—that is, having the ability to read VB and

write C# (or vice versa).

How This Book Is Organized

Chapter 1, Getting Started, walks you through creating your first web site,

HelloWorld.

Chapter 2, Building Web Applications, goes over the fundamentals of web sites and

covers the basic controls available to you in ASP.NET.

Chapter 3, Snappier Web Sites with AJAX, shows you how to integrate this powerful

client-side technology into your pages.

Chapter 4, Saving and Retrieving Data, shows you how to make your site interact

with data stored in a database. You have controls to retrieve data, allow your users to

interact with that data, and then save it back to the database.

Chapter 5 looks at Validation. ASP.NET provides extensive support for data valida-

tion, including ensuring that a choice has been made, checking that values are within

a range, and matching regular expressions.

Chapter 6, Style Sheets, Master Pages, and Navigation, shows you how to make web

sites that are professional quality, good looking, consistent, and easy to navigate.

Chapter 7 examines State and Life Cycle in ASP.NET. Understanding how, and in

what order, a page and its controls are created on the server and rendered to the

browser is crucial for building successful interactive web sites. State is the current

value of everything associated with the page. This is mostly handled automatically,

but this chapter shows you how useful it can be to the developer.

Poop happens. Chapter 8, Errors, Exceptions, and Bugs, Oh My!, shows you how to

deal with unexpected problems, and also how to debug your application.

Chapter 9, Security and Personalization, shows how you can protect your web site

from malicious users. A related topic is personalization, which allows your end users

to customize the look and feel of the web site according to their personal prefer-

ences. You will see how to use themes and skins to accomplish this.

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Preface

xix

There, you’ll also find access to a book support discussion group that has a section

set aside for questions about Learning ASP.NET. Before you post a question, how-

ever, please check my web site to see if there is a Frequently Asked Questions (FAQ)

list or an errata file. If you check these files and still have a question, then please go

ahead and post it to the discussion center. The most effective way to get help is to

ask a precise question or to create a small program that illustrates your area of con-

cern or confusion, and be sure to mention which edition of the book you have (this is

the first edition).

Using Code Examples

This book is here to help you get your job done. In general, you may use the code in

this book in your programs and documentation. You do not need to contact us for

permission unless you’re reproducing a significant portion of the code. For example,

writing a program that uses several chunks of code from this book does not require

permission. Selling or distributing a CD-ROM of examples from O’Reilly books does

require permission. Answering a question by citing this book and quoting example

code does not require permission. Incorporating a significant amount of example

code from this book into your product’s documentation does require permission.

We appreciate, but do not require, attribution. An attribution usually includes the

title, author, publisher, and ISBN. For example: “Learning ASP.NET 2.0 with AJAX,

and Dan Hurwitz, 978-0-596-51397-9.”

If you feel your use of code examples falls outside fair use or the permission given

above, feel free to contact us at permissions@oreilly.com.

We’d Like to Hear from You

Please address comments and questions concerning this book to the publisher:

O’Reilly Media, Inc.

1005 Gravenstein Highway North

Sebastopol, CA 95472

800-998-9938 (in the United States or Canada)

707-829-0515 (international or local)

707-829-0104 (fax)

We have a web page for this book, where we list errata, examples, and any addi-

tional information. You can access this page at:

http://www.oreilly.com/catalog/9780596513979

To comment or ask technical questions about this book, send email to:

bookquestions@oreilly.com

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