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Home > Programming > Programming Language > Beginning C# 7 Hands-On ??? Advanced Language Features
Beginning C# 7 Hands-On ??? Advanced Language Features
Beginning C# 7 Hands-On ??? Advanced Language Features

Beginning C# 7 Hands-On ??? Advanced Language Features: Learn the advanced-level features of C# 7 using Visual Studio 2017

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Beginning C# 7 Hands-On ??? Advanced Language Features

Creating a Generic Method

In this chapter, you'll learn about generic methods, which are methods that can operate on different data types. You will also learn about constraining a method in terms of the data types that it can operate on, so we'll add a concept called constraints.

Creating a button to exchange and then comparing two values

Open up a project and click on the <html> tab. The only thing to put in there is a button. This time, we will not read any values from the user just to save time. So, go to Toolbox and grab a Button control. Drag and drop it below the line beginning with <form id=... (you can delete the <div> lines, as we won't be needing them). Change the text on the button to say Exchange And Compare. So, this will exchange two values and then compare them. Your complete Default.aspx file should look like the one shown in Figure 2.2.1:

Figure 2.2.1: The complete HTML file for this chapter

Writing a swap function

A swap function is a common thing to write: a function that swaps two values. To do this, go to Solution Explorer, right-click on the name of the website, select Add, and then click on Class. Name the class GenMethods to keep it simple, and then click on OK. When the Visual Studio message comes up, click on Yes.

When the GenMethods file comes up, the only thing that you should leave there is using System. We don't need the constructor for this class, so get rid of that. Then, within the body of GenMethods, define the following between the set of curly braces below the public class GenMethods line:

public static void Swap<T>(ref T x, ref T y)

This will act at the class level: you don't have to make an object of the GenMethods type. In a sense, the only thing that is new here is the fact that this is a Swap<T> function, which means that...

Chapter review

For review, the complete version of the Default.aspx.cs file for this chapter, including comments, is shown in the following code block:

//using is a directive
//System is a name space
//name space is a collection of features that our needs to run
using System;
//public means accessible anywhere
//partial means this class is split over multiple files
//class is a keyword and think of it as the outermost level of grouping
//:System.Web.UI.Page means our page inherits the features of a Page
public partial class _Default : System.Web.UI.Page
{
    protected void Button1_Click(object sender, EventArgs e)
    {
        int x = 25, y = 34;//declare and set two variables
        sampLabel.Text = $"x={x}, y={y}";//display variables
        GenMethods.Swap (ref x, ref y);//swap values
        sampLabel.Text += $"<br>x={x}, y={y}";//display swapped values
     ...

Summary

In this chapter, you learned about generic methods, which are methods that can operate on different data types. You also learned about constraining a method in terms of the data types that it can operate on, a concept called constraints. You created a GenMethods class, wrote a Swap function, compared values using the CompareTo method, learned about constraints, and modified the program to perform additional types of comparisons and to work with different data types.

In the next chapter, you will learn about up casting, down casting, and then how to implement a generic interface and how that exactly helps us.

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Key benefits

  • • Learn C#, Visual Studio, and object-oriented programming
  • • Get practical examples of advanced C# language features so that you can easily master them yourself
  • • Use the C# programming language to work generics and lambda expressions
  • • Program C# and SQL Server 2017
  • • Get ready for your first MVC applications

Description

Beginning C# 7 Hands-On – Advanced Language Features assumes that you’ve mastered the basic elements of the C# language and that you're now ready to learn the more advanced C# language and syntax, line by line, in a working Visual Studio environment. You'll learn how to code advanced C# language topics including generics, lambda expressions, and anonymous methods. You'll learn to use query syntax to construct queries and deploy queries that perform aggregation functions. Work with C# and SQL Server 2017 to perform complex joins and stored procedures. Explore advanced file access methods, and see how to serialize and deserialize objects – all by writing working lines of code that you can run within Visual Studio. This book is designed for beginner C# developers who have mastered the basics now, and anyone who needs a fast reference to using advanced C# language features in practical coding examples. You'll also take a look at C# through web programming with web forms. By the time you’ve finished this book, you’ll know all the critical advanced elements of the C# language and how to program everything from C# generics to XML, LINQ, and your first full MVC web applications. These are the advanced building blocks that you can then combine to exploit the full power of the C# programming language, line by line.

Who is this book for?

This book is for anyone who is interested in learning how to program the more advanced aspects of the C# language. Previous programming knowledge of C# is required, at least to the level of basic object-oriented programming. Readers can benefit from first reading Tom Owsiak’s companion book, Beginning C# 7 Hands-On – The Core Language, as a preparation for the more advanced elements and techniques presented in this book.

What you will learn

  • • Learn C# advanced language elements and techniques
  • • Discover advanced C# techniques with hands-on working examples
  • • Build on your knowledge of OOP by using C# generics and lambda expressions
  • • Work with C# and LINQ custom data types
  • • Program C# and SQL Server 2017 to manage and query data
  • • Create your first full MVC application
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Oct 31, 2017
Length: 310 pages
Edition : 1st
Language : English
ISBN-13 : 9781788294263
Vendor :
Microsoft
Category :
Programming
Languages :
C#
Concepts :
Programming Language
Tools :
Visual Studio

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Publication date : Oct 31, 2017
Length: 310 pages
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Language : English
ISBN-13 : 9781788294263
Vendor :
Microsoft
Category :
Programming
Languages :
C#
Concepts :
Programming Language
Tools :
Visual Studio

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Table of Contents

29 Chapters
Creating a Simple Generics Class Chevron down icon Chevron up icon
Creating a Simple Generics Class
Creating a generics class
Adding a button to Default.aspx
Initializing a collection of integers to their array and displaying the results
Chapter review
Summary
Creating a Generic Method Chevron down icon Chevron up icon
Creating a Generic Method
Creating a button to exchange and then comparing two values
Writing a swap function
Chapter review
Summary
Implementing a Generic Interface to Accomplish Sorting Chevron down icon Chevron up icon
Implementing a Generic Interface to Accomplish Sorting
Adding a button to sort and display results
Creating a generics interface class
Entering the reference code
Chapter review
Summary
Making Delegates More Flexible with Generics Chevron down icon Chevron up icon
Making Delegates More Flexible with Generics
Adding a summarize button to the HTML
Summary
Creating and Using Generic Dictionaries Chevron down icon Chevron up icon
Creating and Using Generic Dictionaries
Adding a show button to the HTML
Starting a process from a web page
Making a directory and creating a file from Command Prompt
Chapter review
Summary
Connection Between Delegates and Lambda Expressions Chevron down icon Chevron up icon
Connection Between Delegates and Lambda Expressions
Adding a Show Results button to the HTML
Adding delegates
Chapter review
Summary
Expression-Bodied Lambdas and Expression-Bodied Members Chevron down icon Chevron up icon
Expression-Bodied Lambdas and Expression-Bodied Members
Adding a box and a Find Max button to the HTML
Making the delegate
Chapter review
Summary
Anonymous Methods and Objects That Run Their Own Delegates Chevron down icon Chevron up icon
Anonymous Methods and Objects That Run Their Own Delegates
Adding a Show Results button to the HTML
Streamlining writing functions
Chapter review
Summary
C# with LINQ and Built-In Types Chevron down icon Chevron up icon
C# with LINQ and Built-In Types
Adding a Show Values button to the HTML
Adding namespaces
Chapter review
Summary
C# with LINQ and Custom Data Types Chevron down icon Chevron up icon
C# with LINQ and Custom Data Types
Adding a Show People button to the HTML
Setting up a database
Chapter review
Summary
Using Query Syntax to Construct Queries Chevron down icon Chevron up icon
Using Query Syntax to Construct Queries
Adding a show button to the HTML
Creating a decimal salary array
Observing deferred execution
Chapter review
Summary
Queries That Perform Aggregation Functions Chevron down icon Chevron up icon
Queries That Perform Aggregation Functions
Adding a show button to the HTML
Creating an array
Chapter review
Summary
Using LINQ to Summarize Tuples Chevron down icon Chevron up icon
Using LINQ to Summarize Tuples
Adding a show tuple summary values button to the HTML
Introducing tuples
Chapter review
Summary
Summarizing Results with Grouping Chevron down icon Chevron up icon
Summarizing Results with Grouping
Adding a Show Results button to the HTML
Adding namespaces
Chapter review
Summary
Joining Datasets with Inner Joins Chevron down icon Chevron up icon
Joining Datasets with Inner Joins
Adding a Join Classes button to the HTML
Adding the namespaces
Chapter review
Summary
Downloading, Installing, and Running SQL Server 2017 Chevron down icon Chevron up icon
Downloading, Installing, and Running SQL Server 2017
Downloading SQL Server 2017 express
Working with SQL server inside Visual Studio
Chapter review
Summary
Writing Code to Manually Connect to a Table and Retrieve Records Chevron down icon Chevron up icon
Writing Code to Manually Connect to a Table and Retrieve Records
Adding a show records button to the HTML
Making the connection string
Chapter review
Summary
Inserting Records into Tables Using Stored Procedures Chevron down icon Chevron up icon
Inserting Records into Tables Using Stored Procedures
Adding text boxes and a button to the HTML
Reviewing what you created already in SQL Server
Chapter review
Summary
Using the Nullable Feature to Make Apps More Stable Chevron down icon Chevron up icon
Using the Nullable Feature to Make Apps More Stable
Adding a Show People button to the HTML
Chapter review
Summary
Connecting a Chart Control to SQL Server Chevron down icon Chevron up icon
Connecting a Chart Control to SQL Server
Placing a chart into the HTML page
Adding a new table to the People database
Coding the project
Chapter review
Summary
Using LINQ to Operate on Tables from SQL Server Chevron down icon Chevron up icon
Using LINQ to Operate on Tables from SQL Server
Changing the data in the ExperimentValues table
Chapter review
Summary
Creating a Page That Saves Text to Disk Chevron down icon Chevron up icon
Creating a Page That Saves Text to Disk
Creating an application to save text
Chapter review
Summary
Creating a Page That Uses the File Upload Control Chevron down icon Chevron up icon
Creating a Page That Uses the File Upload Control
Starting our project from scratch
Chapter review
Summary
Serializing and Deserializing Objects Chevron down icon Chevron up icon
Serializing and Deserializing Objects
Adding two buttons to the HTML
Chapter review
Summary
Having a Little Fun with Images with Pixel Manipulations Chevron down icon Chevron up icon
Having a Little Fun with Images with Pixel Manipulations
Manipulating an image
Chapter review
Summary
Saving an Image to SQL Server Chevron down icon Chevron up icon
Saving an Image to SQL Server
Adding buttons and a list box to HTML
Chapter review
Summary
Creating and Using an XML File Chevron down icon Chevron up icon
Creating and Using an XML File
Adding a button to HTML
Chapter review
Summary
Creating XML Files with C# Chevron down icon Chevron up icon
Creating XML Files with C#
Adding a button to HTML
Chapter review
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Querying XML Documents with LINQ Chevron down icon Chevron up icon
Querying XML Documents with LINQ
Adding a text box and a button to HTML
Chapter review
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About the author

Profile icon Tom Owsiak
Tom Owsiak
I have eight years experience as a teacher of mathematics, physics, statistics, and programming. I worked for five years as a database programmer using various technologies such as .NET, Clipper, SQL, SQL Server, SAS, Excel, and many related technologies. I'm the publisher of one of the most successful courses on Udemy, called "Learn C# With Visual Studio 2013". Currently, I work as a mathematics, and computer science teacher at Mercy College in Dobbs Ferry, NY.
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On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on [email protected] within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

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Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela