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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 : Oct 31, 2017
Length: 310 pages
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Language : English
ISBN-13 : 9781788294263
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ISBN-13 : 9781788294263
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Microsoft
Category :
Languages :

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Table of Contents

29 Chapters
Creating a Simple Generics Class Chevron down icon Chevron up icon
Creating a Generic Method Chevron down icon Chevron up icon
Implementing a Generic Interface to Accomplish Sorting Chevron down icon Chevron up icon
Making Delegates More Flexible with Generics Chevron down icon Chevron up icon
Creating and Using Generic Dictionaries Chevron down icon Chevron up icon
Connection Between Delegates and Lambda Expressions Chevron down icon Chevron up icon
Expression-Bodied Lambdas and Expression-Bodied Members Chevron down icon Chevron up icon
Anonymous Methods and Objects That Run Their Own Delegates Chevron down icon Chevron up icon
C# with LINQ and Built-In Types Chevron down icon Chevron up icon
C# with LINQ and Custom Data Types Chevron down icon Chevron up icon
Using Query Syntax to Construct Queries Chevron down icon Chevron up icon
Queries That Perform Aggregation Functions Chevron down icon Chevron up icon
Using LINQ to Summarize Tuples Chevron down icon Chevron up icon
Summarizing Results with Grouping Chevron down icon Chevron up icon
Joining Datasets with Inner Joins Chevron down icon Chevron up icon
Downloading, Installing, and Running SQL Server 2017 Chevron down icon Chevron up icon
Writing Code to Manually Connect to a Table and Retrieve Records Chevron down icon Chevron up icon
Inserting Records into Tables Using Stored Procedures Chevron down icon Chevron up icon
Using the Nullable Feature to Make Apps More Stable Chevron down icon Chevron up icon
Connecting a Chart Control to SQL Server Chevron down icon Chevron up icon
Using LINQ to Operate on Tables from SQL Server Chevron down icon Chevron up icon
Creating a Page That Saves Text to Disk Chevron down icon Chevron up icon
Creating a Page That Uses the File Upload Control Chevron down icon Chevron up icon
Serializing and Deserializing Objects Chevron down icon Chevron up icon
Having a Little Fun with Images with Pixel Manipulations Chevron down icon Chevron up icon
Saving an Image to SQL Server Chevron down icon Chevron up icon
Creating and Using an XML File Chevron down icon Chevron up icon
Creating XML Files with C# Chevron down icon Chevron up icon
Querying XML Documents with LINQ Chevron down icon Chevron up icon
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