从C#到TypeScript 3.1：.NET Core开发者实战指南

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"Hands-On TypeScript for C# and .NET Core Developers.2018" 本书《Hands-On TypeScript for C# and .NET Core Developers》是专为已经熟悉C#和.NET Core的开发者设计的一份实践指南，旨在帮助他们过渡到TypeScript 3.1，并利用ASP.NET Core 2构建应用程序。作者Francesco Abbruzzese是一位经验丰富的技术专家，他通过本书向读者介绍如何在实际开发环境中应用TypeScript。 TypeScript是一种由微软开发的开源编程语言，它是JavaScript的一个超集，添加了静态类型系统和面向对象的特性。学习TypeScript对于C#开发者来说尤其有价值，因为两者都具有强类型和面向对象的特性，使得转换过程相对平滑。TypeScript编译成JavaScript，因此可以在任何支持JavaScript的平台上运行。本书的核心内容可能包括以下几个方面： 1. **TypeScript基础**：涵盖TypeScript的基本语法，如变量声明、数据类型、函数、类、接口等，这些都是从C#转向TypeScript时的关键知识点。 2. **类型系统**：讲解TypeScript的静态类型系统，包括类型注解、泛型、枚举和联合类型，以及如何利用这些类型来提升代码的可读性和稳定性。 3. **面向对象编程**：介绍TypeScript中的类、继承、多态性等面向对象概念，以及如何与JavaScript的原型链相融合。 4. **模块与命名空间**：探讨如何组织和管理代码，包括导入和导出模块，以及使用命名空间来避免全局作用域的污染。 5. **ES6+特性**：由于TypeScript支持ES6及更高版本的特性，如箭头函数、Promise、async/await等，读者将学习如何在TypeScript中使用这些现代JavaScript特性。 6. **错误检查与调试**：介绍TypeScript的编译时错误检查，以及如何利用这些检查来预防运行时错误，同时讨论如何设置和使用调试工具。 7. **与.NET Core结合**：讲解如何在ASP.NET Core项目中集成TypeScript，创建基于TypeScript的前端和后端应用程序，以及如何进行跨平台开发。 8. **实战项目**：通过实际的开发案例，比如构建一个简单的Web应用，让读者将理论知识应用到实践中，加深对TypeScript和.NET Core的掌握。 9. **最佳实践与工具**：介绍TypeScript社区的推荐实践，如使用TypeScript配置文件（tsconfig.json），以及常用的开发工具如Visual Studio Code和TypeScript编译器（tsc）。通过本书的学习，开发者不仅能掌握TypeScript的基本语法和高级特性，还能了解如何将其与强大的.NET Core框架结合，构建高效、健壮的全栈应用程序。无论是对个人技能提升还是团队开发效率的提高，都有显著的帮助。

Preface

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Somewhat unfortunately, knowledge of these subjects is spread across a variety of

locations, so it is very frustrating when you come to write modern rich-client web

applications. For instance, if you decide to learn Angular, you'll discover that you need to

learn TypeScript beforehand, and then you'll discover that a knowledge of TypeScript is not

enough either, because you also need to learn more about ECMAScript 6 and JavaScript

modules. Finally, if you have resisted hitherto, you'll discover that you also need to learn

about bundling and WebPack.

This book consolidates in a single place all the knowledge you require to implement a

modern rich-client web application using a non-trivial JavaScript/TypeScript code

base—TypeScript, ECMAScript 6 features, JavaScript modules, TypeScript library

development and testing, bundling modules with WebPack, and the Angular single-page

application framework.

Who this book is for

This book was conceived mainly for ASP.NET developers who want to start developing

rich-client applications using non-trivial TypeScript code bases. This book explains how to

improve classic server-based web applications using well architected TypeScript code

bases, and also how to build modern single-page applications in TypeScript with ASP.NET

Core and Angular.

While the last part of the book focuses on Angular, the book covers TypeScript,

ECMAScript 6 JavaScript features, JavaScript modules, and WebPack bundler, these being

the starting points for learning any other single page application framework/library, such

as React, Vue.js, Knockout.js, Aurelia, and Meteor. Hence, this book is also a useful tool for

any ASP.NET developer who would like to learn any of the preceding

frameworks/libraries, but who lacks some basic knowledge to embark on this learning path.

While most of the chapters use Visual Studio ASP.NET Core project templates, the book

only requires a basic knowledge of Visual Studio, and C#, so it can be read by any web

developer with a basic knowledge of ES5 JavaScript, a basic knowledge of any modern

object-oriented language, such as C#, C++, or Java, and a basic knowledge of either Visual

Studio or any another similar IDE.

Preface

[ 3 ]

What this book covers

Chapter 1, Introduction to TypeScript, explains how to install and configure TypeScript

transpiler, TypeScript base types, variable declarations, and scoping. It also discusses

TypeScript's mission, and how TypeScript types can help you to write, debug, and maintain

your code bases.

Chapter 2, Complex Types and Functions, explains the basics of the language: arrays, tuples,

interfaces, and function declarations. It also explains how to define new types by

performing operations on existing types, and how to simplify your code with ECMAScript

6 destructuring and spread.

Chapter 3, DOM Manipulation, covers TypeScript types used to describe and manipulate

the DOM, and how to use JavaScript libraries such as jQuery from TypeScript.

Chapter 4, Using Classes and Interfaces, covers TypeScript object programming, classes,

interfaces, inheritance, and interface implementations. A complete code example explains

how to architect a modular application with the help of abstract classes, interfaces,

and inheritance.

Chapter 5, Generics, covers TypeScript generics, and how to define constraints on generics

and type-mappings based on generics. TypeScript generics mimic C# generics, but, like C++

generics, they disappear in the compiled code.

Chapter 6, Namespaces and Modules, covers TypeScript's modular organization of code

based either on namespaces, or on ECMAScript 6 modules. While TypeScript modules are

completely based on ECMAScript 6 modules, they may run also in environments that do

not support ECMAScript 6 modules, since ECMAScript 6 syntax may be processed by

JavaScript bundlers such as WebPack, or transpiled in the syntax of AMD, CommonJS, or

SystemJS loaders, that run on all platforms/browsers.

Chapter 7, Bundling with WebPack, contains a quite complete and practical description of

WebPack, and of its more frequently used modules and loaders. Here, the reader can learn

everything that is worth knowing in terms of using WebPack with most modern JavaScript

frameworks/libraries.

Chapter 8, Building TypeScript Libraries, describes how to develop a TypeScript library

package with Visual Studio Code, how to test it with Jasmine, and how to package it as an

npm package.

Preface

[ 4 ]

Chapter 9, Decorators and Advanced ES6 Features, covers all ECMAScript 6 features, such as

Symbols, Iterators/Generators, and Promises, that were not covered in previous

chapters. The chapter also covers TypeScript's async/await notation, which is transpiled

to Promise-based code, and TypeScript decorators and metadata that are important

Angular building blocks.

Chapter 10, Angular ASP.NET Core Project Template, introduces Angular architecture, and

describes all the parts an Angular CLI project is composed of, and how to configure a

project. The chapter then lists all Angular building blocks, focusing on modules,

components, and data binding.

Chapter 11, Input and Interactions, explains how to take and validate user input, and how to

customize standard data binding behavior with pipes and life cycle hooks. The chapter also

covers the interaction of components through JavaScript and custom events.

Chapter 12, Angular Advanced Features, covers the details of attribute and structural

directive usage and definition. The chapter also explains how to customize components

with content projection (that is, filling predefined holes with input content), and how to

improve the user interface with Angular animations, giving all details of Angular

animation syntax.

Chapter 13, Navigation and Services, covers all Angular features conceived for complex

applications, navigation among application pages, and how to dynamically load Angular

modules. It also covers how components can communicate with the server using Angular

HTTP Client class, and how HTTP Client and other services can be injected into

components' constructors with the help of dependency injection. It also describes how to

test components and other Angular classes.

To get the most out of this book

We would be needing the Visual Studio Community edition (version 15.8.7 or higher)

software and Visual Studio Code (version 1.28 or higher).

Download the example code files

You can download the example code files for this book from your account at

www.packt.com. If you purchased this book elsewhere, you can visit

www.packt.com/support and register to have the files emailed directly to you.

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