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Beginning C# 7 Hands-On ?????? The Core Language

By : Tom Owsiak

2 (2)

Beginning C# 7 Hands-On ?????? The Core Language

2 (2)

By: Tom Owsiak

Overview of this book

Beginning C# 7 Hands-On - The Core Language teaches you core C# language and syntax in a working Visual Studio environment. This book covers everything from core language through to more advanced features such as object-oriented programming techniques. This book is for C# 7 beginners who need a practical reference to core C# language features. You'll also gain a view of C# 7 through web programming with web forms, so you'll learn HTML, basic CSS, and how to use a variety of controls, such as buttons and drop-down lists. You'll start with the fundamentals of C# and Visual Studio, including defining variables, interacting with users, and understanding data types, data conversions, and constants. You'll move on to checking conditions using if/else blocks, and see how to use loops to do things such as repeat blocks of code. After covering various operators to evaluate and assign control structures, you'll see how to use arrays to store collections of data. By the time you’ve finished the book, you’ll know how to program the vital elements of the core C# language. These are the building blocks that you can then combine to build complex C# programs.

Preface

Preface

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

Why C# and How to Download and Install the Visual Studio Community Edition

Why C# and How to Download and Install the Visual Studio Community Edition

Locating and downloading the Visual Studio Community edition

Summary

Customizing Visual Studio to Make it Feel More Personal

Customizing Visual Studio to Make it Feel More Personal

Customizing Visual Studio

Selecting the text editor font and size

Selecting the Statement Completion font and size

Selecting the Environment font and size

Positioning Visual Studio panels

Summary

Creating and Running Your First Page

Creating and Running Your First Page

Starting a new project in Visual C#

Working with Solutions Explorer

Adding a document to your browser

Working with HTML code in Visual Studio

Launching the HTML code

Summary

Creating and Running a Page That Incorporates C#

Creating and Running a Page That Incorporates C#

Improving your first program

Working in the Design view

Working in the Source view

Viewing the code in your browser

Summary

Creating and Using a Single Variable

Creating and Using a Single Variable

Setting up Visual C# to deal with a variable

Running the code

Summary

String Interpolation and Updating Visual Studio

String Interpolation and Updating Visual Studio

Selecting a NuGet package

Summary

Formatting Output Strings for More Professional Results

Formatting Output Strings for More Professional Results

Setting a value and formatting it as currency

Summary

Using Variables and Data Types

Using Variables and Data Types

Setting a page title automatically

Summary

Computed Variables and Basic Math

Computed Variables and Basic Math

Declaring and setting two variables to signify two different salaries

Summary

Interacting with Users Through the Web Page

Interacting with Users Through the Web Page

Using Toolbox to search for a command

Summary

Using Method Chaining to Write More Compact Code

Using Method Chaining to Write More Compact Code

Inserting a text box into the markup

Summary

Reacting to a Single Condition with If/Else Blocks

Reacting to a Single Condition with If/Else Blocks

Adding checkbox to your code

Making a Variable Grow by Adding 1

Making a Variable Grow by Adding 1

Growing a variable by one

Summary

Repeating Blocks of Code with While Loops

Repeating Blocks of Code with While Loops

Inserting a button

Summary

Repeating Blocks of Code with For Loops

Repeating Blocks of Code with For Loops

Inserting a button

Summary

Iterating Over Collections with foreach Loops

Iterating Over Collections with foreach Loops

Inserting TextBox

Summary

Examining Multiple Variable Values with Switch Blocks

Examining Multiple Variable Values with Switch Blocks

Inserting DropBox and Label

Summary

Improving Input Processing with TryParse

Improving Input Processing with TryParse

Inserting a button and a textbox

Summary

Replacing If/Else Blocks with the Ternary Operator

Replacing If/Else Blocks with the Ternary Operator

Inserting two text boxes and a button

Summary

Operators That Evaluate and Assign in Place

Operators That Evaluate and Assign in Place

Inserting Button and Label

Summary

Checking Two Conditions with the Logical AND Operator

Checking Two Conditions with the Logical AND Operator

Setting up the project

Summary

Checking Two Conditions with the Logical OR Operator

Checking Two Conditions with the Logical OR Operator

Working with check boxes

Summary

Declaring, Setting, and Reading Arrays

Declaring, Setting, and Reading Arrays

Setting up the basic interface

Summary

Iterating Over Arrays with foreach Loops

Iterating Over Arrays with foreach Loops

Setting up the beginning interface

Summary

Creating and Using a Simple Method

Creating and Using a Simple Method

Setting up the user interface

Summary

Passing Arrays into Methods

Passing Arrays into Methods

Setting up the user interface

Summary

Reference Type and Value Type Variables

Reference Type and Value Type Variables

Setting up the user interface

Summary

Creating More Flexible Methods with the params Keyword

Creating More Flexible Methods with the params Keyword

Designing the starting markup

Summary

Creating More Flexible Functions with the out Keyword

Creating More Flexible Functions with the out Keyword

Setting up the beginning interface

Summary

Combining the ref and out Keywords to Write Flexible Functions

Combining the ref and out Keywords to Write Flexible Functions

Setting up the starting interface

Summary

The out Keyword in C# 7

The out Keyword in C# 7

Creating the program template

Writing the Summarize function

Implementing the function

Running the program

Summary

Multidimensional Arrays

Multidimensional Arrays

Understanding two-dimensional arrays

Summary

Writing Easier Code with the Var and Dynamic Keywords

Writing Easier Code with the Var and Dynamic Keywords

Setting up the project

Summary

Creating a Class with a Constructor and a Function

Creating a Class with a Constructor and a Function

Our initial markup

Summary

Creating a Class with a Static Method

Creating a Class with a Static Method

Setting up a simple initial interface

Summary

Creating a Class with an Object Property

Creating a Class with an Object Property

Setting up a simple markup page

Summary

Creating a Class with Static Fields, and Properties

Creating a Class with Static Fields, and Properties

Setting up the interface for this project

Summary

Centralizing Common Code with Inheritance

Centralizing Common Code with Inheritance

Setting up the interface for this lesson

Summary

Centralizing Default Code with Virtual Functions

Centralizing Default Code with Virtual Functions

Setting up a basic HTML for this project

Summary

Model Concepts with Abstract Classes

Model Concepts with Abstract Classes

Introducing the basic HTML for this lesson's project

Summary

Using Custom Types as Return Types

Using Custom Types as Return Types

Setting up the project

Summary

Using Lists to Operate on Data Efficiently

Using Lists to Operate on Data Efficiently

Summarizing the values in a list

Summary

Writing Less Code with Polymorphism

Writing Less Code with Polymorphism

Setting up the markup for this project

Summary

Using Interfaces to Express Common Behaviors

Using Interfaces to Express Common Behaviors

Building a hierarchy

Summary

Iterating over Instances with Indexers

Iterating over Instances with Indexers

Setting up a records project

Summary

Building Stabler Apps with Exception Handling

Building Stabler Apps with Exception Handling

Setting up the HTML for this chapter

Using a try block

Summary

Using Named and Optional Parameters

Using Named and Optional Parameters

Setting up the Book class

Summary

Using the Null Coalescing Operator to Write Stabler Applications

Using the Null Coalescing Operator to Write Stabler Applications

Setting up the basic HTML for this project

Searching a database

Summary

Overloading Operators to Perform Custom Operations

Overloading Operators to Perform Custom Operations

Creating a Vector class

Summary

Using Enumerations to Represent Named Constants

Using Enumerations to Represent Named Constants

Setting up a drop-down list

Summary

Creating and Using Namespaces

Creating and Using Namespaces

Creating a new project with a new namespace

Summary

Structs, Random Points, and Sleeping Threads

Structs, Random Points, and Sleeping Threads

Adding a SimpleStruct class file

Coding the struct

Modifying the HTML to make use of the struct

Making an array of points

Displaying the results

Running the program

Debugging the program

Lesson review

Summary

Declaring, Creating, and Using Delegates

Declaring, Creating, and Using Delegates

Setting up the HTML for this project

Checking out the interface

Making a delegate

Running the program

Summary

Switch Blocks with when in C# 7.0

Switch Blocks with when in C# 7.0

Creating the classes

Writing the Main function code

Running the program

Summary

Switch Blocks with Objects in C# 7.0

Switch Blocks with Objects in C# 7.0

Creating the interface

Implementing the interface

Creating the Main() program

Running the program

Summary

Tuples in C# 7.0

Tuples in C# 7.0

Creating the tuple function

Writing the Main() code

Running the program

Summary

Local functions in C# 7.0

Local functions in C# 7.0

Creating the application and core functions

Creating the local function

Running the code

Summary

Throwing Exceptions in C# 7.0

Throwing Exceptions in C# 7.0

Creating the main code

Running the program

Summary

Tuples in C# 7.0, Part 2

Tuples in C# 7.0, Part 2

Creating the constructor

Summary

Writing the Main() code

How do you make use of this? Well, let's go into the Main() code block and type the following:

var (sum, average) = Summarize(new double[] { 1, 4, 5, 3, 6 });

If you hover over Summarize and look at the tooltip, you'll observe that it says double sum, double average:

Figure 4.3: Mouse hover tooltip

This confirms that our function is capable of returning two values, not only one value, so it's already more flexible and powerful. We then just send our Summarize function a new array containing some random values that we'll use for testing. So, Summarize takes an array and finds the sum and average. These values are returned as a tuple, then saved to the sum, average variable below. After that, they're accessible; you can make use of them. Let's do this now by printing the result. On the next line, type the following:

WriteLine...

CONTINUE READING

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Tech Concepts

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Programming languages

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Beginning C# 7 Hands-On ?????? The Core Language

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