深入探索C#编程全解析

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深入理解C#是一本旨在帮助读者全面掌握C#编程语言的专业指南。该书由Jon Skeet和Manning出版社共同编著，针对那些希望深入探索C#语言特性和最佳实践的开发者提供了详尽的知识体系。C#是一种面向对象的、类型安全的、强类型的编程语言，由Microsoft开发，广泛应用于Windows应用开发、游戏开发、Web开发等领域。书中涵盖的内容包括但不限于C#的基本语法、类和对象、接口与继承、泛型、异步编程、委托与事件、LINQ查询以及.NET框架的基础知识。作者会深入剖析C#的设计哲学，讨论其在性能优化、代码组织和模块化等方面的策略，并通过实例演示如何有效地运用这些概念解决实际问题。此外，本书还可能包含C#的最新特性，如C# 9和.NET Core的更新，以及对C#在云端开发（如Azure）中的应用介绍。对于在线获取该书或订购优惠信息，读者可以访问Manning出版社的官方网站www.manning.com，那里有更多关于折扣和购买方式的详细说明。版权方面，所有内容受Manning Publications Co.保护，未经书面许可，禁止任何形式的复制、存储、检索或传输。书中的产品名称和制造商设计标识被标注为商标，体现了对知识产权的尊重。为了确保书籍内容的持久性和质量，Manning出版社坚持使用酸性-free纸张，并致力于提供最好的印刷标准。《深入理解C#》是一本不可或缺的参考书籍，无论是初学者还是进阶开发者，都能从中受益匪浅，提升自己的C#技能和编程实践能力。

CONTENTS

11.4 Let clauses and transparent identifiers 294

Introducing an intermediate computation with let 295

Transparent identifiers 296

11.5 Joins 297

Inner joins using join clauses 297

■

Group joins with

join … into clauses 301

■

Cross joins using multiple

from clauses 303

11.6 Groupings and continuations 307

Grouping with the group … by clause 307

■

Query

continuations 310

11.7 Summary 313

LINQ beyond collections 314

12.1 LINQ to SQL 315

Creating the defect database and entities 315

■

Populating the

database with sample data 318

■

Accessing the database with

query expressions 319

■

Updating the database 324

■

LINQ to

SQL summary 325

12.2 Translations using IQueryable and IQueryProvider 326

Introducing IQueryable<T> and related interfaces 326

■

Faking

it: interface implementations to log calls 328

■

Gluing expressions

together: the Queryable extension methods 330

■

The fake query

provider in action 332

■

Wrapping up IQueryable 333

12.3 LINQ to DataSet 334

Working with untyped datasets 334

■

Working with typed

datasets 335

12.4 LINQ to XML 338

XElement and XAttribute 338

■

Converting sample defect data

into XML 340

■

Queries in LINQ to XML 341

■

LINQ to

XML summary 343

12.5 LINQ beyond .NET 3.5 344

Third-party LINQ 344

■

Future Microsoft LINQ technologies 348

12.6 Summary 350

Elegant code in the new era 352

13.1 The changing nature of language preferences 353

A more functional emphasis 353

■

Static, dynamic, implicit,

explicit, or a mixture? 354

FOREWORD

xviii

Of the latter kind, there are some who are content to master their craft and exer-

cise their talents for the pleasure and profit it brings. Then there are those who are

not just artists, theorists, and technicians; somehow they find the time to pass that

knowledge on to others as mentors.

I have no idea if Jon Skeet is any kind of pianist. But from my email conversations

with him as one of the C# team’s Most Valuable Professionals over the years, from

reading his blog and from reading every word of this book at least three times, it has

become clear to me that Jon is that latter kind of software developer: enthusiastic,

knowledgeable, talented, curious and analytical—a teacher of others.

C# is a highly pragmatic and rapidly evolving language. Through the addition of

query comprehensions, richer type inference, a compact syntax for anonymous func-

tions, and so on, I hope that we have enabled a whole new style of programming while

still staying true to the statically typed, component-oriented approach that has made

C# a success.

Many of these new stylistic elements have the paradoxical quality of feeling very

old (lambda expressions go back to the foundations of computer science in the first

half of the twentieth century) and yet at the same time feeling new and unfamiliar to

developers used to a more modern object-oriented approach.

Jon gets all that. This book is ideal for professional developers who have a need to

understand the “what” and “how” of the latest revision to C#. But it is also for those

developers whose understanding is enriched by exploring the “why” of the language’s

design principles.

Being able to take advantage of all that new power will require new ways of think-

ing about data, functions, and the relationship between them. It’s not unlike trying to

play jazz after years of classical training—or vice versa. Either way, I am looking for-

ward to finding out what sorts of functional compositions the next generation of C#

programmers come up with. Happy composing, and thanks for choosing the key of

C# to do it in.

ERIC LIPPERT

Senior Software Engineer, Microsoft

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