head first c#.pdf第三版特別涵蓋 Windows Phone 專案讓你的物件充分

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详细说明：第三版特別涵蓋 Windows Phone 專案讓你的物件充分運用抽象化與繼承的強大威力 C#、XAML 與 .NET 編程實務的學習指南探索 MVVM（Model-View-ViewModel）設計模式的絕妙奧義『假如你想要以趣味橫生的方式深入學習 C#，這本書正是為你量身訂製的。』 — Andy Parker，C# 程式設計新手『《深入淺出 C#》將引領各種背景的初學者一窺 C# 與 .NET Framework 的堂奧，並與之建立一段富有成效的長遠關係。』 — Chris Burrows，Microsoft C# Compiler 團隊的開發者『《深入淺出 C#》讓我table of contents objects: get oriente Making Code Make Sense Every program you write solves a problem When you're building a program, it's always a good idea to start by thinking about what problem your program's supposed to solve. Thats why objects are really useful. They let you structure your code based on the problem it's solving, so that you can spend your time thinking about the problem you need to work on rather than getting bogged down in the mechanics of writing code. When you use objects right, you end up with code that 's intuitive to write, and easy to read and change How Mike thinks about his problems How mike's car navigation system thinks about his problems Mikes Navigator class has methods to set and modify routes Use what you' ve learned to build a program that uses a class Mike can use objects to solve his problem You use a class to build an object When you create a new object from a class, it's called an instance of that class 94 Navigator A better solution. brought to you by objects Modify Route ToAvoidO) Modify Route ToInclude( newNavigator() An instance uses fields to keep track of things 100 GetRouteO Let's create some instances. 101 TotalDistanceO gator dos What's on your programs mind 103 You can use class and method names to make your code intuitive Give your classes a natural structure Class diagrams help you organize your classes so they make sense 108 Build a class to work with some guy 112 Create a project for your guys 113 Build a form to interact with the guys 114 its methods, just like a blueprint There's an easier way to initialize objects 117 defines the layout of the house and you can use one class to make any number of obiects table of contents pes and references Its 10: 00. Do you know where your data is? Data type, database, Lieutenant Commander Data. it's all important stuff. Without data, your programs are useless. You need information from your users, and you use that to look up or produce new information to give back to them. In fact, almost everything you do in programming involves working with data in one way or another. In this chapter, you'll learn the ins and outs of Cts data types, see how to work with data in your program, and even figure out a few dirty secrets about objects(pssst. . objects are data, too The variable's type determines what kind of data it can store 126 A variable is like a data to-go cup 128 10 pounds of data in a 5 pound bag Even when a number is the right size, you cant just assign it to any variable 130 When you cast a value that's too big, C# will adjust it automatically 131 C# does some casting automaticall 132 When you call a method the arguments must be compatible with the types of the parameters 133 Combining with an operator 138 Objects use variables, too Refer to your objects with reference variables 140 References are like labels for your object 141 If there arent any more references, your object gets D。 g fido garbage-collected 142 Dog lucky new Dog()i UCKY Multiple references and their side effects 144 Two references means TwO ways to change an object's data 149 obje special case: arrays 150 Wele 152 fido new Dog ()i py Joe's Budget House o' Discount Sandwiches Objects use references to talk to each other 154 Dog oos Where no object has gone before 155 9 ob Build a typing game 160 lucky null Poof!!- FiDO /、 obje XIII table of contents G#了ab1 A Day at the races Joe, Bob, and Al love going to the track, but they're tired of losing all their money. They need you to build a simulator for them so they can figure out winners before they lay their money down. And, if you do a good job they'lI cut you in on their profits The spec: build a racetrack simulator 170 The Finished Product 178 A Day at the Races table of contents encapsulation Keep your privates.a private Ever wished for a little more privacy? Sometimes your objects feel the same way. Just like you don 't want anybody you dont trust reading your journal or paging through your bank statements, good objects don t let other objects go poking around their fields. In this chapter, you're going to learn about the power of encapsulation. You'l make your object's data private, and add methods to protect how that data is accessed Kathleen is an event planner What does the estimator do? 181 Kathleen's Test drive Each option should be calculated individually 188 It's easy to accidentally misuse your objects 190 Encapsulation means keeping some of the data in a class private 191 iget Use encapsulation to control access to your class's methods and field 192 But is the realName field REallY protected? 193 Private fields and methods can only be accessed from inside the class 194 Encapsulation keeps your data pristine 202 Properties make encapsulation easier 203 76Aoerk Build an application to test the Farmer class 204 Use automatic properties to finish the class What if we want to change the feed multiplier? 206 Use a constructor to initialize private fields Juice and soda 5 s7 discount on (15 per p total cost +50 decorating nUMber of Health feel ple Choice? F00d(25 decorations? Alcohol NoVecorations (20 per 750 person person +13 I decorating fee table of contents inheritance Your objects family tree Sometimes you do want to be just like your parents Ever run across an object that almost does exactly what you want your object to do? Found yourself wishing that if you could just change a few things, that object would be perfect? Well, that' s just one reason that inheritance is one of the most powerful concepts and techniques in the C# language. Before you're through with this chapter, you'll learn how to subclass an object to get its behavior, but keep the flexibility to make changes to that behavior. You'll avoid duplicate code, model the real world re closely, and end up with code that s easier to maintain Kathleen does birthday parties. too 216 We need a birthday party class 217 Build the party Planner version 2.0 218 When your classes use inheritance, you only need to write your code once 226 Kathleen needs to figure out the cost of her parties, no matter what kind of parties they are 226 Build up your class model by starting general and getting more specific 227 How would you design a zoo simulator? 228 Use inheritance to avoid duplicate code in subclasses Think about how to group the animals Create the class hierarchy 232 Every subclass extends its base class 233 A subclass can override methods to change or replace methods it inherited 238 Any place where you can use a base class, you can use one of its subclasses instead 239 A subclass can hide methods in the superclass 246 Use the override and virtual keywords to inherit behavior 248 Now you're ready to finish the job for Kathleen 25 Build a beehive management system 257 First you'l build the basic system 258 Use inheritance to extend the bee management system 263 table of contents interfaces and abstract classes Making classes keep their promises Actions speak louder than words Sometimes you need to group your objects together based on the things they can do rather than the classes they inherit from That's where interfaces come in -they let you work with any class that can do the job. But with great power comes great responsibility, and any class that implements an interface must promise to fulfill all of its obligations .. or the compiler will break their kneecaps, see? x Inheritance Let's get back to bee-sics 270 米米 We can use inheritance to create classes for different types of bees 271 An interface tells a class that it must implement certain methods 米 Abstraction and properties Use the interface keyword to define an interface 273 Encapsulation 米 Classes that implement interfaces have to include all of the interface's methods 275 米 You cant instantiate an interface, but you can reference an interface 278 米 Interface references work just like object references 279 amorphism 米 You can find out if a class implements a certain interface with "is" 280 Interfaces can inherit from other interfaces 281 Location Name casting works with both objects and interfaces 285 Exits Downcasting lets you turn your appliance back into a coffee maker 286 Description( Upcasting and downcasting work with interfaces, too 287 There's more than just public and private Outside Access modifiers change visibility Decoration Hot Some classes should never be instantiated 295 An abstract class is like a cross between a class and an interface 296 An abstract method doesnt have a body Polymorphism means that one object can take many different forms 307 Dining Living room Kitchen Back Yard XVIl table of contents enums and collections Storing lots of data When it rains, it pours In the real world, you don 't get to handle your data in tiny little bits and pieces No, your datas going to come at you in loads, piles, and bunches. You'll need some pretty powerful tools to organize all of it, and that's where collections come in. They let you store, sort, and manage all the data that your programs need to pore through. That way, you can think about writing programs to work with your data, and let the collections worry about keeping track of it for you Strings don't always work for storing categories of data 328 Enums let you work with a set of valid values Enums let you represent numbers with names 330 We could use an array to create a deck of cards 333 Lists are more flexible than arrays 336 Generics can store any type 340 Collection initializers work just like object initializers 344 Let's create a list of ducks 345 Lists are easy, but SORTING can be tricky 346 I Comparable helps your list sort its ducks 347 Use IComparer to tell your list how to sort 348 Create an instance of your comparer object 349 I Comparer can do complex comparisons Overriding a To String method lets an object describe itself 353 Update your foreach loops to let your Ducks and cards print themselves 354 You can upcast an entire list using IEnumerable You can build your own overloaded methods 357 The Dictionary functionality rundown 364 Build a program that uses a dictionary Poo!一 And yet more collection types a queue is FiFO-First In, First Out 378 a stack is lifo-Last In. First Out 379 XVI table of contents G#了ab The quest Yourjob is to build an adventure game where a mighty adventurer is on a quest to defeat level after level of deadly enemies. You'll build a turn-based system, which means the player makes one move and then the enemies make one move. The player can move or attack, and then each enemy gets a chance to move and attack. The game keeps going until the player either defeats all the enemies on all seven levels or dies The spec: build an adventure game 386 The funs just beginning 406 The quest Right Don Play Bat XIX

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