ASP.NET MVC 4 Mobile App Development

Table of Contents

ASP.NET MVC 4 Mobile App Development

Credits

About the Author

Acknowledgment

About the Reviewers

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Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. Developing for the Mobile Web

History of the mobile web

The Nokia 9000

Market fragmentation

WAP 1.0 and WML

WAP 2.0 and XHTML MP

Continued development constraints

Processing constraints

Network constraints

Content compression

Server to client compression

Minification

Image optimizations

Lower color depth

CSS image sprites

Data URIs

Content Delivery Networks

Cached data

Less traffic

Presentation constraints

Single window

Lower resolution

Content spacing

Viewing the mobile web

Market percentage

Browser variants and compatibility

WebKit

Trident

Gecko

Presto

Emulating the mobile web

Mobile device and browser emulators

Opera

Android

iOS

Windows Mobile

The user agent

Emulating Internet Explorer Mobile

Emulating Mobile Safari

Emulating Chrome for Mobile

Emulation in this book

Support for the mobile web in ASP.NET MVC 4

Summary

2. Homebrew and You

Understanding the homebrew domain

Knowing your ingredients

Malt

Yeast

Ale versus lager

Hops

Brewing

Mashing

Sparging

The boil

Fermentation

Bottling and kegging

About our mobile app

App requirements

Adding, editing, and deleting recipes

Adding recipes to a library

Rating recipes

Commenting on recipes

Anonymous browsing, authenticated contributing

The BrewHow solution

Creating the project

Choosing our template

The Empty template

The Basic template

The Internet Application template

The Intranet Application template

The Mobile Application template

The Web API template

Project changes in MVC 4

NuGet

Global.asax

Launching the BrewHow app

Responsive design

Configuring and launching an emulator

Summary

3. Introducing ASP.NET MVC 4

The Model-View-Controller pattern

The controller

The view

The model

The MVC pattern and ASP.NET MVC 4

Controllers in ASP.NET MVC

Creating the Recipe controller

Introduction to routing

Action methods

ActionResults

Invoking the Recipe controller

Views in ASP.NET MVC

Razor

The @ character

Code blocks

Expressions

Inline code

Comments

Shared views

Layouts

The _ViewStart file

Partial views

HTML helpers

Html.RenderPartial and Html.Partial

Html.RenderAction and Html.Action

Display templates

Html.Display

Html.DisplayFor

Html.DisplayForModel

Editor templates

Creating our Recipe view

Making Recipe default

Returning a model to the view

Using ViewData

Using ViewBag

Using TempData

Strongly typed models

Returning a Recipe list

Creating the model

Returning the model

Displaying the model

Summary

4. Modeling BrewHow in EF5

What's new in Entity Framework 5.0?

Performance enhancements

LocalDB support

Enumeration support

The BrewHow model

Modeling data

Recipe

Review

Style

Category

The BrewHow context

Generating our database

Altering the model

Adding relationships

Overriding conventions

Enabling migrations

The InitialCreate migration

The Configuration class

Adding seed data

Adding a migration

Applying migrations

Consuming the model

Pagination

Summary

5. The BrewHow Domain and Domain-driven Design

Tenets of DDD

Domain model

Entities

Value objects

Aggregates

Factories

Repositories

Services

BrewHow design

BrewHow entities

BrewHow repositories

Consuming the domain

Recipe view model

Data annotations

Recipe controller

GET versus POST

Model binding

Recipe views

Summary

6. Writing Maintainable Code

The SOLID principles

Single Responsibility Principle

Open Closed Principle

Liskov Substitution Principle

Interface Segregation Principle

Dependency Inversion Principle

SOLIDifying BrewHow

Adding interfaces

Infrastructure

Dependency Injection

Service locator

Managed Extensibility Framework

Convention-based configuration

MEF Service Locator

Using the MEF Service Locator

Dependency Resolver

The MefDependencyResolver class

Completing the conversion

IBrewHowContext

Repositories

Registering dependencies

Summary

7. Separating Functionality Using Routes and Areas

Routes

Locating by style

Routing constraints

Style interaction

Recipe list modification

Style Controller and view

Slugging BrewHow

Model slugs

Stage the database

Modifying entities

Retrieval by slug

Areas

Creating the review area

Registering the Review area

The Recipe review controller

Recipe review view models

Recipe review action methods

Creating the views

Area route values

Routing namespaces

Summary

8. Validating User Input

Data validation

Data annotations

MetadataType attribute

Updating the database

Validating the validations

Server validation

Cross-Site Request Forgery (CSRF)

ValidateAntiForgeryToken

Cross-Site Scripting (XSS)

ValidateInput attribute

AllowHtml

Html.Raw

Summary

9. Identifying and Authorizing Users

User authentication

Windows authentication

Forms authentication

Authenticating BrewHow users

SimpleMembership

Customizing authentication

SimpleMembership initialization

Unifying contexts

The UserProfile repository

AccountController contexts

Registering and logging in

External authentication

Registering with an external account

Associating an external account

Authorization

Restricting access

The Authorize attribute

Authorizing user contributions

Cleaning the UI

Content ownership

Enabling ownership

UserProfile schema mapping

Seeding users

Applying the ownership migration

Assigning ownership

Enforcing ownership

Adjusting the view model

Ensuring ownership

Validating ownership

A recipe library

The library data model

The library repository

The library controller

The library view

Summary

10. Asynchronous Programming and Bundles

Asynchronous programming

Task Parallel Library

Task

Creating a Task

Awaiting completion

Completion callbacks

Async

Await

Asynchronous controller action methods

Creating asynchronous actions

An asynchronous recipe controller

Bundles

Creating bundles

Bundle types

Wildcard support

Consuming bundles

Summary

11. Coding for the Real-time Web

Simulating a connected state

Long polling

Forever Frame

Server-Sent Events

WebSockets

SignalR

Persistent connections

Hubs

Real-time recipe updates

Installing and configuring SignalR

Creating the recipe hub

Modifying the recipe list view

Publishing event notifications

Summary

12. Designing Your App for Mobile Devices

HTML5

Markup changes

The DOCTYPE tag

The character set

Type attributes

Visual Studio 2012 support

Semantic tags

The article tag

The header tag

The section tag

The nav tag

The footer tag

Modifying recipe details

Custom data attributes

Form controls

Local storage

Geolocation

CSS3

Media types

CSS selectors

Type selectors

ID selectors

Attribute selectors

Class selectors

Universal selectors

Pseudo-class selectors

CSS media queries

Media features

The viewport meta tag

A responsive design

A responsive list

Summary

13. Extending Support for the Mobile Web

Mobile views

A .Mobile layout

Mobilizing BrewHow

Removing content

Prioritizing content

How it works

Display modes

Supporting Asus Nexus 7

Creating the display mode

Registering the display mode

Testing with Nexus 7

Summary

14. Improving the User Experience with jQuery Mobile

Installing jQuery Mobile

Enabling the jQuery Mobile bundle

Viewing the results

jQuery Mobile's layout

Data-roles and data attributes

Form elements

Themes

$.mobile

View switcher

Mobilizing BrewHow

Adjusting the header

The home button

Logging in users

Site navigation

Creating a footer

Desktop footer

Configuring content

Recipe list

The jQuery Mobile listview

Expanded listview content

Listview filters

Buttons

Navigation hints

Recipe details

Back button

Action buttons

Recipe edits

Fieldcontain

Reviews

IsMobileDevice

Mobile views

Summary

15. Reader Challenges

Full-text search

Embedded search

Search boxes

APIs

Lucene.NET

SQL Server Full-text Search

Socialization

Social media support

Recipe additions

Recipe sharing

Offline support

Push notifications

Going native

ASP.NET Web API

Developing native apps

PhoneGap and Appcelerator

Xamarin

Summary

Index

ASP.NET MVC 4 Mobile App Development

ASP.NET MVC 4 Mobile App Development

Copyright © 2013 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

First published: July 2013

Production Reference: 1160713

Published by Packt Publishing Ltd.

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ISBN 978-1-84968-736-2

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Cover Image by Abhishek Pandey (<[email protected]>)

Credits

Author

Andy Meadows

Reviewers

Shailendra Chauhan

Shiju Varghese

Acquisition Editor

Mary Jasmine Nadar

Commissioning Editor

Llewellyn F. Rozario

Lead Technical Editor

Neeshma Ramakrishnan

Technical Editors

Mausam Kothari

Rikita Poojari

Amit Ramadas

Project Coordinator

Arshad Sopariwala

Proofreader

Christopher Smith

Indexer

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Graphics

Abhinash Sahu

Production Coordinators

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Cover Work

Nitesh Thakur

About the Author

Andy Meadows has been in a love affair with technology since his third-grade teacher introduced him to her TRS-80 Model III in 1981. After several months of typing Go North on the keyboard, he began his foray into BASIC programming. The TRS-80 Model III begat a Commodore 64 and an introduction to Pascal. By 1988, he was spending his summers earning money by writing software in C for local small businesses.

While attending college at the University of Georgia, Andy developed his passion for web development and, of course, beer. His first web application was a series of CGI scripts that output content for NCSA Mosaic and by 1994, he was designing web interfaces for global information systems.

After college, Andy wandered listlessly through the IT world spending time in several verticals using several different languages, but he always returned home to web development. In 2002, he began his foray into mobile development beginning with native Java development, and quickly moving into the mobile web space where he began marrying his two passions: mobile web development and .NET.

Since then, Andy has worked on several projects involving mobile development, web development, or both. He is extremely excited about the future of the mobile web made possible by the newest generation of mobile devices. He is currently working at a startup in Atlanta, where he lives with his wife and two children.

Acknowledgment

Writing this book was one of the biggest challenges I have ever undertaken. When originally approached with the idea for this book, I was hesitant. I'd heard horror stories about the sheer level of effort and commitment it takes to complete this task, but after consulting with the family I decided to try. Let me tell you, those stories are wrong. It was much, much more difficult than I had heard, but more fulfilling than I could have imagined.

The biggest commitment I had to make when writing this book was time. Lots and lots of time. Fortunately, I was blessed with a wonderful supporting cast.

I would first like to thank the people at Packt Publishing for their gentle encouragement and guidance through this process. They were truly a pleasure to work with, and their level of commitment to their authors and a quality product is evident in every action they take.

To my reviewers, thanks for the candid feedback—both critical and complimentary. This book is better because of you.

To my wife, Amy, and my two children, Noah and Nate, who permitted me to undertake this venture, thank you for your patience and support. And thanks for letting me take over practically every room in the house at one point in time as I attempted to find my muse. I sure must have done something right at one point to deserve the unconditional love you have shown through the long days at work, followed by the long nights in front of the computer. I love you all.

About the Reviewers

Shailendra Chauhan is an N-Tier Application Developer & .NET Consultant in Noida, Delhi, Gurgaon NCR region, India. He has 4.5 years of experience in building web applications using Microsoft Technologies including ASP.NET, MVC, C#, jQuery, SQL Server, WCF, Web API, Entity Framework, and many more web things. He loves to work with Internet applications using Microsoft technology and other related technologies.

He likes to share his experience and knowledge through his blogs www.dotnet-tricks.com and www.windowsappstutorial.com, which he started in Jan 2012. He strives to be the best he can be. He always tries to gain more knowledge and skills in Microsoft Technologies. He always keeps up with new technologies and learning new skills that allow him to provide better solutions to problems.

Shiju Varghese is a Microsoft MVP and a Technical Architect, specializing in Cloud, Mobility, and Web technologies. His current technology focus is on Windows Azure, ASP.NET MVC, Node.js, HTML 5, and CQRS. Shiju is passionate about building Cloud apps on the Windows Azure Platform. His areas of interest include Cloud Computing, Enterprise Mobility, Agile software development, Domain-Driven Design (DDD), Test-Driven Development (TDD), and Web application scalability. Shiju has been working with .NET technologies since its inception.

Shiju works as a Technical Architect in Marlabs Inc where he is focusing on Cloud apps with Windows Azure.

Thanks to my lovely wife, Rosmi, for her support and motivation. I would also like to thank my daughter, Irene Rose.

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Preface

Today's web developers are faced with a multitude of challenges in delivering their product to market. Once upon a time, applications only needed to look and function properly within Internet Explorer. Today's applications must not only function within multiple browsers, but on multiple operating systems running on multiple devices.

ASP.NET MVC 4 Mobile App Development is meant to serve as a guide to successfully building web applications that target current desktop browsers and browsers meant to consume the mobile web.

ASP.NET MVC 4 Mobile App Development walks you through the process of creating a web application from concept to delivery.

What this book covers

In the first section of this book, we build a fully functional sample application to manage and share recipes for homebrewed beers. Chapter 1, Developing for the Mobile Web, begins with a discussion on the importance of understanding how to develop for the mobile web. You are then given a brief history of how we arrived to at the mobile web of today. The chapter ends by discussing all of the constraints we, as developers, must acknowledge if we are to successfully develop applications for the mobile web.

Chapter 2, Homebrew and You, introduces you to the domain of homebrewing and BrewHow—our homebrew recipe sharing application. From our understanding of this domain we build the requirements for our application and then examine how ASP.NET MVC 4 and its new features will help us develop it. We conclude the chapter by setting up our environment to launch our mobile emulator to design and test our application.

Chapter 3, Introducing ASP.NET MVC 4, introduces the MVC pattern. We then discuss how it is implemented within ASP.NET MVC 4 as we begin to build our application. By the end of this chapter the initial shell of our application will be complete and running inside our desktop and mobile browsers.

Chapter 4, Modeling BrewHow in EF5, walks us through creating a data model for BrewHow. We begin by discussing the new features and improvements of Entity framework and create a data model and database for our domain using the code-first model in EF. The model and database are continually refined through the use of migrations until the needs of our application are met and our application is consuming data from LocalDB.

Chapter 5, The BrewHow Domain and Domain-driven Design, introduces us to the tenets of DDD. We apply these tenets to BrewHow by creating repositories, view models, and domain entities to enforce the boundaries between persistence, logic, and display.

Chapter 6, Writing Maintainable Code, begins with a discussion on the SOLID principles of object-oriented design; principles that serve to facilitate the writing of maintainable code. We then review the topics of Dependency Injection and Inversion of Control as tools to help us SOLIDify the BrewHow codebase. This chapter ends by applying these principles and tools to the codebase leveraging the extension points provided to us by ASP.NET MVC 4.

Chapter 7, Separating Functionality Using Routes and Areas, provides a detailed discussion on this key piece of technology in ASP.NET MVC 4. We examine how, by leveraging routing and areas, we can create meaningful SEO-friendly URLs and separate the functionality of BrewHow into discrete units of work for the content contained within BrewHow. We then exercise our knowledge by adding support for user reviews.

Chapter 8, Validating User Input, looks at the server-side support for data validation contained within the .NET Framework's System.ComponentModel.DataAnnotations namespace. The data model and view models are modified to support the use of these attributes so we can validate input on the client side and again once the data has made it to the server. We also explore how these technologies help protect BrewHow from common web attacks such as CSRF and XSS.

Chapter 9, Identifying and Authorizing Users, introduces the new membership functionality available in ASP.NET MVC 4. BrewHow is modified to support user authentication using the new membership functionality and we then modify the application to allow authentication using a Google login. We end the chapter by tying together the BrewHow data model with the membership data model so we can associate recipes and reviews with the users that created them.

Our application is now functionally complete and has met all of the requirements set forth in Chapter 2, Homebrew and You. In the second section of the book we take a look at a few advanced features provided by ASP.NET MVC 4. Chapter 10, Asynchronous Programming and Bundles, explores how we can design the server-side portion of our application to get information to our users more efficiently and with less wait time—something critical for mobile applications. To accomplish this, we begin by examining and then implementing support for asynchronous actions. We then examine the support of minification provided to us in the form of bundles.

Chapter 11, Coding for the Real-Time Web, investigates how we can use always-on connectivity to provide the illusion of a desktop application within BrewHow. We then leverage SignalR to simulate push notifications from the server to BrewHow.

With our application fully optimized to deliver content to mobile devices, we can now begin the third part of the book. Chapter 12, Designing Your App for Mobile Devices, discusses how we can use the next-generation of web standards, HTML5 and CSS3, to create responsive markup to present our content to users in a manner best fitting the device on which they are viewing it.

Chapter 13, Extending Support for the Mobile Web, extends the concept of mobile design to our servers as we explore the mobile view support built into ASP.NET MVC 4. We then extend this concept to target specific mobile devices using the new support for display modes.

Chapter 14, Improving the User Experience with jQuery Mobile, shows how BrewHow can be converted to a mobile web application that looks and feels as if it were native to the device. We look at some of the controls provided by jQuery Mobile and apply them within the context of everything we have learned to build a fully polished and functional mobile application.

Chapter 15, Reader Challenges, presents how BrewHow could be extended to be an even richer experience for the user. We discuss how full-text search technology could be integrated into BrewHow, how we might provide support for social networking, and how we might even extend BrewHow into a truly native mobile application. The readers are then encouraged to undertake these tasks themselves.

What you need for this book

To build the sample application within this book you will need a copy of Microsoft Visual Studio Express for Web 2012. To view the sample application you will need a web browser capable of supporting HTML5 and CSS3. The sample application in this book was tested using the current version of Google Chrome and Opera Mobile Emulator running on Windows 8.

Who this book is for

This book is for any individual wishing to learn ASP.NET MVC 4 and its role in developing applications that target the mobile web. The material in this book assumes the reader has familiarity with the .NET framework and exposure to C#. If you are new to ASP.NET MVC and want a good solid introduction, if you want to learn what's new in ASP.NET MVC 4, or if you want to learn how you can modify your web applications to support multiple devices this book is for you.

Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: In prior versions of MVC, all of the application bootstrap code was located in the Global.asax code-behind.

A block of code is set as follows:

.white-go

{

    width:31px;

    background:url('img-sprite.png') 0 0;

}

.orange-go

{

    width: 31px;

    background:url('img-sprite.png') -32px 0;

}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

public interface IBrewHowContext

{

  IDbSet Recipes { get; set; }

  IDbSet Reviews { get; set; }

  IDbSet Styles { get; set; }

IDbSet UserProfiles { get; set; }

  int SaveChanges();

}

public class BrewHowContext : DbContext, IBrewHowContext

{

  public IDbSet Recipes { get; set; }

  public IDbSet Reviews { get; set; }

  public IDbSet Styles { get; set; }

  public IDbSet UserProfiles { get; set; }

  public BrewHowContext()

    : base(DefaultConnection)

  {

  }

  /* ... */

}

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: Select the ASP.NET MVC 4 Web Application icon and provide a name and location for the new project in the Name and Location text boxes respectively.

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.

Reader feedback

Feedback from our readers is always welcome. Let us know what you think about this book—what you liked or may have disliked. Reader feedback is important for us to develop titles that you really get the most out of.

To send us general feedback, simply send an e-mail to <[email protected]>, and mention the book title via the subject of your message.

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