C#编程入门：结合英文版Microsoft Visual C# 2010 Step by Step学习指南

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"一步一步的学通C#（英文版）是John Sharp所著的一本面向初学者的C#编程教程，通过Microsoft Visual C# 2010 Step by Step的方式引导读者深入理解C#语言。这本书旨在帮助读者在学习编程知识的同时提升英语阅读能力，实现双重学习目标。" C#是一种由微软开发的面向对象的编程语言，主要用于构建Windows应用程序、网络服务以及游戏等。本书针对C#初学者，采用逐步指导的方式，涵盖了C#的基础知识到高级特性，包括但不限于： 1. **基础语法**：讲解C#的基本数据类型（如整型、浮点型、字符串和布尔型）、变量声明、常量、运算符以及控制流程（如条件语句、循环结构）。 2. **函数和类**：介绍函数的定义与调用，类的概念、属性、方法、构造函数以及继承、封装和多态等面向对象编程的核心概念。 3. **集合与泛型**：讲解数组、列表、字典等集合类型的使用，以及泛型在提高代码复用性方面的应用。 4. **异常处理**：如何使用try-catch块来捕获和处理程序运行时可能出现的错误。 5. **文件操作**：学习读写文件、流的概念以及如何处理I/O操作。 6. **事件和委托**：了解事件处理机制，以及如何使用委托作为回调函数。 7. **LINQ（Language Integrated Query）**：C#中的查询语言特性，用于简化数据查询和操作。 8. **异步编程**：介绍异步编程模型，如async/await关键字，用于编写非阻塞的高性能应用程序。 9. **Windows Forms和WPF**：学习创建图形用户界面（GUI）应用，包括控件、布局管理以及事件处理。 10. **.NET Framework**：简述.NET框架的组成部分，如Common Language Runtime (CLR) 和Base Class Library (BCL)。 11. **单元测试和调试**：如何编写和执行单元测试，以及使用Visual Studio的调试工具进行问题排查。 12. **软件工程实践**：讲解版本控制、代码审查、项目组织和文档编写等最佳实践。本书不仅适合完全没有编程经验的初学者，也对有一定基础的开发者提供了深入学习C#的途径。通过阅读英文版，读者可以同时提升编程技能和专业英语水平，拓宽职业发展道路。此外，书中可能还包含了一些关于Microsoft的相关技术，如Visual Studio IDE的使用，这将帮助读者更好地理解和使用C#开发环境。

Table of Contents xv

Part VI Building Professional Solutions with

Visual Studio 2010

27 Introducing the Task Parallel Library . . . . . . . . . . . . . . . . . . . . . . 599

Why Perform Multitasking by Using Parallel Processing?. . . . . . . . . . . . . . . . .600

The Rise of the Multicore Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 601

Implementing Multitasking in a Desktop Application. . . . . . . . . . . . . . . . . . . . 602

Tasks, Threads, and the ThreadPool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 603

Creating, Running, and Controlling Tasks . . . . . . . . . . . . . . . . . . . . . . . . .604

Using the Task Class to Implement Parallelism . . . . . . . . . . . . . . . . . . . . .608

Abstracting Tasks by Using the Parallel Class . . . . . . . . . . . . . . . . . . . . . . 617

Returning a Value from a Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 624

Using Tasks and User Interface Threads Together . . . . . . . . . . . . . . . . . . . . . . . 628

Canceling Tasks and Handling Exceptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 632

The Mechanics of Cooperative Cancellation. . . . . . . . . . . . . . . . . . . . . . . 633

Handling Task Exceptions by Using the AggregateException Class . . . . 641

Using Continuations with Canceled and Faulted Tasks . . . . . . . . . . . . . .645

Chapter 27 Quick Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .646

28 Performing Parallel Data Access. . . . . . . . . . . . . . . . . . . . . . . . . . 649

Using PLINQ to Parallelize Declarative Data Access. . . . . . . . . . . . . . . . . . . . . . 650

Using PLINQ to Improve Performance While Iterating Through a

Collection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650

Specifying Options for a PLINQ Query . . . . . . . . . . . . . . . . . . . . . . . . . . . 655

Canceling a PLINQ Query. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 656

Synchronizing Concurrent Imperative Data Access . . . . . . . . . . . . . . . . . . . . . . 656

Locking Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 659

Synchronization Primitives in the Task Parallel Library . . . . . . . . . . . . . . 661

Cancellation and the Synchronization Primitives . . . . . . . . . . . . . . . . . . .668

The Concurrent Collection Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .668

Using a Concurrent Collection and a Lock to Implement

Thread-Safe Data Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 670

Chapter 28 Quick Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 681

xvii

Acknowledgments

An oft-repeated fable is that the workmen who paint the Forth Railway Bridge, a large

Victorian cantilever structure that spans the Firth of Forth just north of Edinburgh, have a

job for life. According to the myth, it takes them several years to paint it from one end to

the other, and when they have ﬁnished they have to start over again. I am not sure whether

this is due to the ferocity of the Scottish weather, or the sensitivity of the paint that is used,

although my daughter insists it is simply that the members of Edinburgh City Council have

yet to decide on a color scheme that they really like for the bridge. I sometimes feel that this

book has similar attributes. No sooner have I completed an edition and seen it published,

then Microsoft announces another cool update for Visual Studio and C#, and my friends at

Microsoft Press contact me and say, “What are your plans for the next edition?” However,

unlike painting the Forth Railway Bridge, working on a new edition of this text is always an

enjoyable task with a lot more scope for inventiveness than trying to work out new ways

to hold a paint brush. There is always something novel to learn and innovative technology

to play with. In this edition, I cover the new features of C# 4.0 and the .NET Framework 4.0,

which developers will ﬁnd invaluable for building applications that can take advantage of the

increasingly powerful hardware now becoming available. Hence, although this work appears

to be a never-ending task, it is always fruitful and pleasurable.

A large part of the enjoyment when working on a project such as this is the opportunity to

collaborate with a highly motivated group of talented people within Microsoft Press, the

developers at Microsoft working on Visual Studio 2010, and the people who review each

chapter and make suggestions for various improvements. I would especially like to single out

Rosemary Caperton and Stephen Sagman who have worked tirelessly to keep the project

on track, to Per Blomqvist who reviewed (and corrected) each chapter, and to Roger LeBlanc

who had the thankless task of copy-editing the manuscript and converting my prose into

English. I must also make special mention of Michael Blome who provided me with early

access to software and answered the many questions that I had concerning the Task Parallal

Library. Several members of Content Master were kept gainfully employed reviewing and

testing the code for the exercises—thanks Mike Sumsion, Chris Cully, James Millar, and Louisa

Perry. Of course, I must additionally thank Jon Jagger who co-authored the ﬁrst edition of

this book with me back in 2001.

Last but by no means least, I must thank my family. My wife Diana is a wonderful source

of inspiration. When writing Chapter 28 on the Task Parallel Library I had a mental block

xix

Introduction

Microsoft Visual C# is a powerful but simple language aimed primarily at developers creating

applications by using the Microsoft .NET Framework. It inherits many of the best features of

C++ and Microsoft Visual Basic, but few of the inconsistencies and anachronisms, resulting

in a cleaner and more logical language. C# 1.0 made its public debut in 2001. The advent of

C# 2.0 with Visual Studio 2005 saw several important new features added to the language,

including Generics, Iterators, and anonymous methods. C# 3.0 which was released with

Visual Studio 2008, added extension methods, lambda expressions, and most famously of

all, the Language Integrated Query facility, or LINQ. The latest incarnation of the language,

C# 4.0, provides further enhancements that improve its interoperability with other languages

and technologies. These features include support for named and optional arguments, the

dynamic type which indicates that the language runtime should implement late binding for

an object, and variance which resolves some issues in the way in which generic interfaces are

deﬁned. C# 4.0 takes advantage of the latest version of the .NET Framework, also version

4.0. There are many additions to the .NET Framework in this release, but arguably the most

signiﬁcant are the classes and types that constitute the Task Parallel Library (TPL). Using the

TPL, you can now build highly scalable applications that can take full advantage of multi-core

processors quickly and easily. The support for Web services and Windows Communication

Foundation (WCF) has also been extended; you can now build services that follow the REST

model as well as the more traditional SOAP scheme.

The development environment provided by Microsoft Visual Studio 2010 makes all these

powerful features easy to use, and the many new wizards and enhancements included in

Visual Studio 2010 can greatly improve your productivity as a developer.

Who This Book Is For

This book assumes that you are a developer who wants to learn the fundamentals of

programming with C# by using Visual Studio 2010 and the .NET Framework version 4.0. In

this book, you will learn the features of the C# language, and then use them to build applica-

tions running on the Microsoft Windows operating system. By the time you complete this

book, you will have a thorough understanding of C# and will have used it to build Windows

Presentation Foundation applications, access Microsoft SQL Server databases by using ADO.

NET and LINQ, build responsive and scalable applications by using the TPL, and create REST

and SOAP Web services by using WCF.

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