Learning C# 3.0. Jesse Liberty and Brian MacDonald O'REILLY. Beijing Cambridge Farnham Köln Sebastopol Taipei Tokyo

Transcription

1 Learning C# 3.0 Jesse Liberty and Brian MacDonald O'REILLY Beijing Cambridge Farnham Köln Sebastopol Taipei Tokyo

2 Table of Contents Preface xv 1. C# and.net Programming 1 Installing C# Express 2 C# 3.0 and.net The.NET Platform 4 The.NET Framework 4 The C# Language 5 Your First Program: Hello World 6 The Compiler 10 Examining Your First Program 11 The Integrated Development Environment 16 Summary 17 Test Your Knowledge: Quiz 18 Test Your Knowledge: Exercise Visual Studio 2008 and C# Express Before You Read Further 22 The Start Page 22 Projects and Solutions 22 Project Types 24 Templates 25 Inside the Integrated Development Environment 26 Building and Running Applications 28

3 Menus 29 The File Menu 29 The Edit Menu 30 The View Menu 36 The Refactor Menu 41 The Project Menu 41 The Build Menu 41 The Debug Menu 41 The Data Menu 41 The Format Menu 42 The Tools Menu 42 The Window Menu 43 The Help Menu 44 Summary 44 Test Your Knowledge: Quiz 45 Test Your Knowledge: Exercises C# Language Fundamentals 46 Statements 46 Types 47 Numeric Types 48 Nonnumeric Types: char and bool 49 Types and Compiler Errors 50 WriteLine() and Output 51 Variables and Assignment 52 Definite Assignment 54 Implicitly Typed Variables 55 Casting 56 Constants 58 Literal Constants 58 Symbolic Constants 58 Enumerations 60 S trings 63 Whitespace 63 Summary 64 Test Your Knowledge: Quiz 65 Test Your Knowledge: Exercises 66 vi I Table of Contents

4 Takle nf Cnntentgvii 4. Operators 68 Expressions 68 The Assignment Operator (=) 69 Mathematical Operators 69 Simple Arithmetic Operators (+, *, /) 70 The Modulus Operator (%) 71 Increment and Decrement Operators 72 The Calculate and Reassign Operators 72 Increment or Decrement by 1 73 The Prefix and Postfix Operators 73 Relational Operators 75 Logical Operators and Conditionals 77 The Conditional Operator 78 Operator Precedence 79 Summary 81 Test Your Knowledge: Quiz 82 Test Your Knowledge: Exercises Branching 85 Unconditional Branching Statements 86 Conditional Branching Statements 88 if Statements 88 Single-Statement if Blocks 90 Short-Circuit Evaluation 92 if else Statements 94 Nested if Statements 95 switch Statements 98 Fall-Through and Jump-to Cases 101 Switch an string Statements 102 ReadLine( ) and Input 103 Iteration (Looping) Statements 104 Creating Loops with goto 105 The while Loop 106 The do...while Loop 108 The for Loop 109 Summary 118 Test Your Knowledge: Quiz 119 Test Your Knowledge: Exercises 120

5 viii I Table of Contents 6. Object-Oriented Programming 121 Creating Models 123 Classes and Objects 123 Defining a Class 124 Class Relationships 125 The Three Pillars of Object-Oriented Programming 126 Encapsulation 126 Specialization 127 Polymorphism 128 Object-Oriented Analysis and Design 129 Summary 130 Test Your Knowledge: Quiz 131 Test Your Knowledge: Exercises Classes and Objects 133 Defining Classes 134 Instantiating Objects 135 Creating a Box Class 137 Access Modifiers 138 Method Arguments 139 Return Types 141 Constructors 142 Initializers 144 Object Initializers 146 Anonymous Types 146 The this Keyword 147 Static and Instance Members 148 Invoking Static Methods 149 Using Static Fields 151 Finalizing Objects 154 Memory Allocation: The Stack Versus the Heap 155 Summary 161 Test Your Knowledge: Quiz 162 Test Your Knowledge: Exercises Inside Methods 165 Overloading Methods 165

6 Encapsulating Data with Properties 168 The get Accessor 171 The set Accessor 172 Automatic Properties 173 Returning Multiple Values 173 Passing Value Types by Reference 175 out Parameters and Definite Assignment 177 Summary 178 Test Your Knowledge: Quiz 178 Test Your Knowledge: Exercises Basic Debugging 180 Setting a Breakpoint 181 Using the Debug Menu to Set Your Breakpoint 183 Setting Conditions and Hit Counts 183 Examining Values: The Autos and Locals Windows 184 Setting Your Watch 188 The Call Stack 189 Stopping Debugging 190 Summary 191 Test Your Knowledge: Quiz 192 Test Your Knowledge: Exercises Arrays 197 Using Arrays 197 Declaring Arrays 198 Understanding Default Values 199 Accessing Array Elements 199 Arrays and Loops 200 The foreach Statement 203 Initializing Array Elements 204 The params Keyword 204 Multidimensional Arrays 205 Rectangular Arrays 206 Jagged Arrays 210 Array Methods 213 Sorting Arrays 214 Table of Contents 1 ix

7 x Table of Contents Summary 216 Test Your Knowledge: Quiz 217 Test Your Knowledge: Exercises Inheritance and Polymorphism 219 Specialization and Generalization 219 Inheritance 222 Implementing Inheritance 222 Calling the Base Class Constructor 225 Hiding the Base Class Method 225 Controlling Access 226 Polymorphism 227 Creating Polymorphic Types 227 Overriding Virtual Methods 230 Using Objects Polymorphically 230 Versioning with new and override 232 Abstract Classes 234 Sealed Classes 237 The Root of All Classes: Object 237 Summary 240 Test Your Knowlege: Quiz 241 Test Your Knowledge: Exercises Operator Overloading 243 Designing the Fraction Class 243 Using the operator Keyword 244 Creating Useful Operators 248 The Equals Operator 248 Conversion Operators 253 Summary 257 Test Your Knowledge: Quiz 258 Test Your Knowledge: Exercises Interfaces 260 What Interfaces Are 260 Implementing an Interface 262 Defining the Interface 265 Implementing the Interface an the Client 266 Implementing More Than One Interface 267

8 Casting to an Interface 270 The is and as Operators 270 Extending Interfaces 276 Combining Interfaces 279 Overriding Interface Methods 280 Explicit Interface Implementation 285 Summary 288 Test Your Knowledge: Quiz 290 Test Your Knowledge: Exercises Generics and Collections 292 Generics 292 Collection Interfaces 293 Creating Your Own Collections 293 Creating Indexers 293 Indexers and Assignment 298 Indexing an Other Values 298 Generic Collection Interfaces 302 The IEnumerable<T> Interface 303 Framework Generic Collections 307 Generic Lists: List<T> 307 Generic Queues 319 Generic Stacks 322 Dictionaries 325 Summary 328 Test Your Knowledge: Quiz 329 Test Your Knowledge: Exercises Strings 331 Creating Strings 332 String Literals 332 Escape Characters 332 Verbatim Strings 333 The ToString( ) Method 333 Manipulating Strings 334 Comparing Strings 334 Concatenating Strings 336 Copying Strings 337 Table of Contents 1 xi

9 xii I Tobte of Contents Testing for Equality 339 Other Useful String Methods 341 Finding Substrings 344 Splitting Strings 346 The StringBuilder Class 348 Regular Expressions 350 The Regex Class 351 Summary 353 Test Your Knowledge: Quiz 354 Test Your Knowledge: Exercises Throwing and Catching Exceptions 357 Bugs, Errors, and Exceptions 358 Throwing Exceptions 358 Searching for an Exception Handler 358 The throw Statement 359 The try and catch Statements 361 How the Call Stack Works 364 Creating Dedicated catch Statements 366 The finally Statement 368 Exception Class Methods and Properties 370 Custom Exceptions 374 Summary 377 Test Your Knowledge: Quiz 378 Test Your Knowledge: Exercises Delegates and Events 380 Delegates 381 Events 385 Publishing and Subscribing 386 Events and Delegates 387 Solving Delegate Problems with Events 394 The event Keyword 395 Using Anonymous Methods 399 Lambda Expressions 400 Summary 401 Test Your Knowledge: Quiz 402 Test Your Knowledge: Exercises 403

10 18. Creating Windows Applications 404 Creating a Simple Windows Form 404 Using the Visual Studio Designer 405 Creating a Real-World Application 411 Creating the Basic UI Form 412 Populating the TreeView Controls 415 Handling the TreeView Events 422 Handling the Button Events 426 Source Code 431 Summary 439 Test Your Knowledge: Quiz 440 Test Your Knowledge: Exercises Windows Presentation Foundation 442 Your First WPF Application 443 WPF Differences from Windows Forms 447 Using Resources 450 Animations 452 Triggers and Storyboards 453 Animations As Resources 456 C# and WPF 460 Grids and Stack Panels 461 Adding Data 466 Using the Data in the XAML 468 Defining the ListBox 468 Event Handling 470 The Complete XAML File 471 Summary 474 Test Your Knowledge: Quiz 476 Test Your Knowledge: Exercises ADO.NET and Relational Databases 477 Relational Databases and SQL 478 Installing the Northwind Database 478 Tables, Records, and Columns 481 Normalization 482 Declarative Referential Integrity 482 SQL 483 Table of Contents 1 xiii

11 The ADO.NET Object Model 485 DataTables and DataColumns 485 DataRelations 485 Rows 485 DataAdapter 486 DbCommand and DbConnection 486 DataReader 486 Getting Started with ADO.NET 486 Summary 489 Test Your Knowledge: Quiz 490 Test Your Knowledge: Exercises LINQ 492 Querying In-Memory Data 492 Anonymous Types and Implicitly Typed Variables 497 Lambda Expressions 499 Ordering and Joining 500 Using LINQ with SQL 505 Using the Object Relational Designer 508 Summary 513 Test Your Knowledge: Quiz 514 Test Your Knowledge: Exercises 515 Appendix: Answers to Quizzes and Exercises 517 Index 649 xiv Table of Contents