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Albahari Joseph Albahari Ben - C# 4.0 Pocket Reference

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When youre programming C 4.0 and need a little help, this tightly focused and practical book tells you exactly what you need to know -- without long introductions or bloated examples. Its ideal as a succinct quick reference or as a guide to get you rapidly up to speed if you already know Java, C++, or an earlier version of C. Written by the authors of the acclaimed C 4.0 in a Nutshell (O{u2019}Reilly), this book covers the entire C 4.0 language -- without skimping on the details -- including: Features new to C 4.0, such as dynamic binding, optional and named parameters, and type parameter variance All of Cs fundamentals Advanced topics, including operator overloading, custom conversions, type constraints, covariance and contravariance, lambda expressions and closures, iterators, nullable types, and operator lifting LINQ, starting with sequences, lazy execution, and standard query operators; finishing with a complete reference to query expressions Unsafe code and pointers, custom attributes, preprocessor directives, and XML documentation. Read more...
Abstract: When you need answers for using C# 4.0, this tightly focused and practical book tells you exactly what you need to know -- without long introductions or bloated samples. Read more...

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C# 4.0 Pocket Reference
Joseph Albahari
Ben Albahari
Editor
Mike Hendrickson

Copyright 2010 Joseph Albahari and Ben Albahari

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While every precaution has been taken in the preparation of this book, the publisher and authors assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein.

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Chapter 1. C# 4.0 Pocket Reference

C# is a general-purpose, type-safe, object-oriented programming language whose goal is programmer productivity . To this end, the language balances simplicity, expressiveness, and performance. The C# language is platform- neutral, but it was written to work well with the Microsoft .NET Framework . C# 4.0 targets .NET Framework 4.0.

Note

The programs and code snippets in this book mirror those in Chapters 24 of C# 4.0 in a Nutshell (Joseph and Ben Albahari, OReilly) and are all available as interactive samples in LINQPad. Working through these samples in conjunction with the book accelerates learning, in that you can edit the samples and instantly see the results without needing to set up projects and solutions in Visual Studio.

To download the samples, click the Samples tab in LINQPad and click Download more samples. LINQPad is freego to http://www.linqpad.net.

Using Code Examples

This book is here to help you get your job done. In general, you may use the code in this book in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.

We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: C# 4.0 Pocket Reference , Third Edition, by Joseph Albahari and Ben Albahari. Copyright 2010 Joseph Albahari and Ben Albahari, 978-1-449-39401-1.

If you feel that your use of code examples falls outside of fair use or the permission given here, feel free to contact us at .

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A First C# Program

Here is a program that multiplies 12 by 30, and prints the result, 360, to the screen. The double forward slashes indicate that the remainder of a line is a comment :

using System; // Importing namespaceclass Test // Class declaration{ static void Main() // Method declaration { int x = 12 * 30; // Statement 1 Console.WriteLine (x); // Statement 2 } // End of method} // End of class

At the heart of this program lies two statements . Statements in C# execute sequentially. Each statement is terminated by a semicolon. The first statement computes the expression12 * 30 and stores the result in a local variable , named x, which is an integer type. The second statement calls the Console classs WriteLinemethod , to print the variable x to a text window on the screen.

A method performs an action in a series of statements, called a statement block a pair of braces containing zero or more statements. We defined a single method named Main.

Writing higher-level functions that call upon lower-level functions simplifies a program. We can refactor our program with a reusable method that multiplies an integer by 12, as follows:

using System;class Test{ static void Main() { Console.WriteLine (FeetToInches (30)); // 360 Console.WriteLine (FeetToInches (100)); // 1200 } static int FeetToInches (int feet) { int inches = feet * 12; return inches; }}

A method can receive input data from the caller by specifying parameters and output data back to the caller by specifying a return type . We defined a method called FeetToInches that has a parameter for inputting feet, and a return type for outputting inches, both of type int (integer).

The literals30 and 100 are the arguments passed to the FeetToInches method. The Main method in our example has empty parentheses because it has no parameters, and is void because it doesnt return any value to its caller. C# recognizes a method called Main as signaling the default entry point of execution. The Main method may optionally return an integer (rather than

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