C#编程进阶： LINQ完全解构与实战指南

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《LINQ.Unleashed for C# (第1版)》是一本由Paul Kimmel所著的专业书籍，专为C#编程爱好者设计，深入讲解了语言集成查询（Language Integrated Query, LINQ）在C#中的应用。本书旨在帮助读者充分理解和掌握LINQ，这是一种强大的功能，它允许程序员以一种声明式的方式操作各种数据源，包括集合、数据库、XML文档等，提供了一种简洁、直观的方式来处理复杂的数据查询和转换。书中涵盖了以下核心知识点： 1. **C#基础与LINQ概述**：首先，对C#语言的基础语法、类和对象、泛型、委托和事件等内容进行回顾，确保读者对C#有扎实的理解，然后逐步引入LINQ的概念，解释其在编程中的位置和目的。 2. **LINQ基本语法**：介绍了查询表达式（query expressions）、方法语法（method syntax）和扩展方法（extension methods），以及如何使用LINQ查询操作符（如Where, Select, OrderBy, GroupBy等）对数据进行筛选、映射和排序。 3. **数据源支持**：讲解了如何通过LINQ与.NET框架中的不同数据源交互，包括数组、列表、集合、数据库（如SQL Server、Entity Framework）、XML和JSON等，展示了LINQ在不同场景下的灵活性。 4. **高级LINQ概念**：涉及分组、聚合函数、子查询、自连接、延迟加载等高级特性，以及LINQ to Objects和LINQ to SQL之间的区别，让读者能够构建更复杂的查询逻辑。 5. **性能优化与最佳实践**：讨论了如何编写高效、可读的LINQ代码，避免N+1问题，以及如何利用数据库查询计划优化性能。 6. **LINQ与.NET框架的其他技术整合**：展示了LINQ如何与其他.NET框架技术（如LINQ to Events、LINQ to Files等）协同工作，以实现全面的数据处理能力。 7. **实战项目与案例分析**：书中包含丰富的实例和练习，帮助读者将理论知识应用于实际开发环境中，提升解决问题的能力。《LINQ.Unleashed for C#》不仅适合初学者学习LINQ，也适合已有C#基础的开发者深化理解并提高编程技能。通过本书，读者可以全面领略LINQ的强大功能，并将其应用于日常开发工作中，提高代码的简洁性和效率。

We Want to Hear from You!

As the reader of this book, you are our most important critic and commentator. We value

your opinion and want to know what we’re doing right, what we could do better, what

areas you’d like to see us publish in, and any other words of wisdom you’re willing to

pass our way.

You can email or write me directly to let me know what you did or didn’t like about this

book—as well as what we can do to make our books stronger.

Please note that I cannot help you with technical problems related to the topic of this book, and

that due to the high volume of mail I receive, I might not be able to reply to every message.

When you write, please be sure to include this book’s title and author, as well as your

name and phone or email address. I will carefully review your comments and share them

with the author and editors who worked on the book.

E-mail: feedback@samspublishing.com

Mail: Neil Rowe

Executive Editor

Sams Publishing

800 East 96th Street

Indianapolis, IN 46240 USA

Reader Services

Visit our website and register this book at www.informit.com/register for convenient

access to any updates, downloads, or errata that might be available for this book.

Introduction

like Lambda Calculus—invented in the 1930s—and if it’s good or great, incorporate these

elements into the tools and languages we love.

LINQ and its underpinnings are powerful and challenging, and in this book you will get

what you need to know to completely understand all that makes LINQ work and begin

using it immediately. You will learn about anonymous methods, extension methods,

Lambda Expressions, state machines, how generics and the CodeDOM play a big role in

powerful tools like LINQ, and writing LINQ queries and why you will want to do it in the

bigger, grander scheme of things. You will also learn how to save a ton of time and effort

by not hard-coding those elements that you will no longer need or want to hard-code, and

you will have a better grasp of how LINQ fits into n-tier architectures without breaking

guidelines that have helped you succeed to date.

Brought to you by a four-time Microsoft MVP and columnist for over a decade, LINQ

Unleashed for C# will teach you everything you need to know about LINQ and .NET 3.5

features and how to be more productive and have more fun than ever before.

Conventions Used in This Book

The following typographic conventions are used in this book:

Code lines, commands, statements, variables, and text you see onscreen appear in a

monospace typeface.

Occasionally in listings bold is used to draw attention to the snippet of code being discussed.

Placeholders in syntax descriptions appear in an

italic monospace typeface. You replace

the placeholder with the actual filename, parameter, or whatever element it represents.

Italics highlight technical terms when they’re being defined.

A code-continuation icon is used before a line of code that is really a continuation of the

preceding line. Sometimes a line of code is too long to fit as a single line on the page. If

you see

➥ before a line of code, remember that it’s part of the line immediately above it.

The book also contains Notes, Tips, and Cautions to help you spot important or useful

information more quickly.

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C#编程进阶： LINQ完全解构与实战指南

Sams.LINQ.Unleashed.for.C.Sharp.Jul.2008

Sams.LINQ.Unleashed.for.CSharp.Jul.2008.rar

linq unleashed for c＃

C#调用httpweb报找不到方法:“System.Collections.Generic.IEnumerator`1<Newtonsoft.Json.Linq.JToken> Newtonsoft.Json.Linq.JArray.GetEnumerator()”

引用Newtonsoft.Json.Linq后提示必须在 Newtonsoft.Json.Linq.JObject 上实现默认访问器，因为它继承自 ICollection

必须在 Newtonsoft.Json.Linq.JObject 上实现默认访问器，因为它继承自 ICollection 异常信息解决方法

c#遍历Newtonsoft.Json.Linq.JArray

无法将类型为“Newtonsoft.Json.Linq.JValue”的对象强制转换为类型“Newtonsoft.Json.Linq.JObject

无法将类型为“Newtonsoft.Json.Linq.JValue”的对象强制转换为类型“Newtonsoft.Json.Linq.JArray”

System.Linq.Dynamic 使用

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