Skip to main content

New Features in C# 7 with Visual Studio 2017

Added and Improvements New Features in C# 7.0 with Visual Studio 2017 -
1.     Added Binary Literal
2.     Added Digit Separators
3.     Added Pattern Matching
4.     Added Ref returns and ref Locals
5.     Added some Tuples Enhancement
6.     Local Function
7.     Throw Expressions
8.     Added some expression bodied members like constructor, destructor, getters and setters in C# 7
9.     Added some enhancement for out variables
10. Deconstruction

Binary Literals -Improvements
int[] numbers = { 1, 2, 4, 6, 12, 40 };
int[] numbers = { 0b1, 0b10, 0b100, 0b1000, 0b10000, 40 };

Digit Separators - Digit separators inside the numbers
Literal Digit Allows underscore (_) inside numbers
var x = 1234_5435;
var y = 0xABCD_EFG_IJ
int[] numbers = { 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 4_0 };

Tuples -
If you want write a common method that returns more than one value. It is add tuple types and tuple literals.
1.     Anonymous types return
2.     Dynamic return type
3.     Custom-built transport type

Example 1 -
int[] numbers = { 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 4_0 };
var tn = TallyNumber(numbers);

WriteLine($"Sum: {tn.Item1}, count: {tn.Item2}");

(int, int) TallyNumber(int[] values)
{
    var rest = (0, 0);

    return rest;
}

Example 2 -
int[] numbers = { 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 4_0 };
var tn = TallyNumber(numbers);

WriteLine($"Sum: {tn.sum}, count: {tn.count}");

(int sum, int count) TallyNumber(int[] values)
{
    var rest = (s:0, c: 0);
    return rest;
}

Example 3 -
int[] numbers = { 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 4_0 };
var(sum, count) = TallyNumber(numbers);

WriteLine($"Sum: {sum}, count: {count}");

(int sum, int count) TallyNumber(int[] values)
{
    var rest = (s:0, c: 0);
    foreach (var val in values)
    {
        rest = (rest.s + val, rest.c + 1);
    }

    return rest;
}

Example 4 -
int[] numbers = { 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 4_0 };
var(sum, count) = TallyNumber(numbers);

WriteLine($"Sum: {sum}, count: {count}");

(int sum, int count) TallyNumber(int[] values)
{
    var rest = (s:0, c: 0);
    foreach (var val in values)
    {
        Add(val, 1);
    }

    return rest;
    void Add(int s, int c) { rest.s += s; rest.c += c; }
}

Local Functions –
Functions inside other function bodies that are called local function.

Example -
int[] numbers = { 0b1, 0b10, 0b100, 0b1000, 0b1_0000, 4_0 };
var(sum, count) = TallyNumber(numbers);

WriteLine($"Sum: {sum}, count: {count}");

(int sum, int count) TallyNumber(int[] values)
{
    var rest = (s:0, c: 0);
    foreach (var val in values)
    {
        Add(val, 1);
    }

    return rest;
    void Add(int s, int c) { rest.s += s; rest.c += c; }
}

Pattern Matching -
1.     Enhancing two existing patterns-
2.     Is-expressions with patterns
3.     Switch case clauses with patterns

Example 1 -
public void PrintDollers(object obj)
{
    if (obj is null) return;     // This is the constant pattern "null"!
    if (!(obj is int k)) return; // This is the type pattern "int k";
   
   WriteLine(new string('$', k));
}

Example 2 -
// Switch on anything lie premitive, string etc.
switch (shape)
{
    case Rectangle sh when(sh.Length == sh.Height): WriteLine($"{sh.Length} x {sh.Height} square");
        break;
    default:
        WriteLine("<unknown shape found!>");
        break;
    case null:
        throw new ArgumentNullException(nameof(shape));
}

Deconstruction -

Example for deconstructing declaration -
(string firstName, string middleName, string lastName) = SearchName(id1); //deconstructing declaration
WriteLine($"found {firstName} {lastName}.");

Example for var inside -
(var firstName, var middleName, var lastName) = SearchName(id1);

Example for var outside -
var(firstName, middleName, lastName) = SearchName(id1);

Example for deconstructing assignment -
(firstName, middleName, lastName) = SearchName(id2);

Ref Returns and Locals –
Returning Values by Reference and It is a Kind of Pointers!
public class User
{
    public int ID { get; set; }
    public int Age { get; set; }
    public string Name { get; set; }
    public string Adress { get; set; }
    public override string ToString() { return $"{ID},{Age},{Name},{Adress}"; }
}

public static ref User FindUser(User U, User[] UList)
{
    for (int j = 0; j < UList.Length; j++)
        if (UList[j].ID == U.ID)
            return ref UList[j];

    throw new IndexOutOfRangeException($"{nameof(U)} not found");
}

References -
https://blogs.msdn.microsoft.com/dotnet/2016/08/24/whats-new-in-csharp-7-0/
By Anil Singh | Rating of this article (*****)

Popular posts from this blog

List of Countries, Nationalities and their Code In Excel File

Download JSON file for this List - Click on JSON file    Countries List, Nationalities and Code Excel ID Country Country Code Nationality Person 1 UNITED KINGDOM GB British a Briton 2 ARGENTINA AR Argentinian an Argentinian 3 AUSTRALIA AU Australian an Australian 4 BAHAMAS BS Bahamian a Bahamian 5 BELGIUM BE Belgian a Belgian 6 BRAZIL BR Brazilian a Brazilian 7 CANADA CA Canadian a Canadian 8 CHINA CN Chinese a Chinese 9 COLOMBIA CO Colombian a Colombian 10 CUBA CU Cuban a Cuban 11 DOMINICAN REPUBLIC DO Dominican a Dominican 12 ECUADOR EC Ecuadorean an Ecuadorean 13 EL SALVA...

nullinjectorerror no provider for httpclient angular 17

In Angular 17 where the standalone true option is set by default, the app.config.ts file is generated in src/app/ and provideHttpClient(). We can be added to the list of providers in app.config.ts Step 1:   To provide HttpClient in a standalone app we could do this in the app.config.ts file, app.config.ts: import { ApplicationConfig } from '@angular/core'; import { provideRouter } from '@angular/router'; import { routes } from './app.routes'; import { provideClientHydration } from '@angular/platform-browser'; //This (provideHttpClient) will help us to resolve the issue  import {provideHttpClient} from '@angular/common/http'; export const appConfig: ApplicationConfig = {   providers: [ provideRouter(routes),  provideClientHydration(), provideHttpClient ()      ] }; The appConfig const is used in the main.ts file, see the code, main.ts : import { bootstrapApplication } from '@angular/platform-browser'; import { appConfig } from ...

Top 15+ Angular 17 Interview Questions Answers | For Experienced Professionals as well

G Google team released the latest version of Angular – Angular 17 on November 6, 2023, creating a significant milestone for the super fast front-end development. What Are the New Features in Angular 17? 1.       Angular 17 is the highly anticipated release for the community, bringing many new exciting features, updates, and improvements. 2.       New Syntax for Control Flow in Templates - new @if, @switch, @for, @case, @empty @end control flow syntax 3.       Deferred Loading - @defer partial template 4.       The Angular signals API 5.       Angular SSR and client hydration 6.       Automatic Migration to Build-in Control Flow 7.       Build Performance with ESBuild 8.       By default, set this newly generated component as a standalone, and now we don't have an app module file. To use (ng...

51 Best React Interview Questions and Answers

1) What Is React? React is a fast, open-source, and front-end JavaScript library and It was developed by Facebook in 2011 for building complex, stateful and interactive UI in web as well as mobile Applications. React follows the component based approach which helps you to building reusable and interactive web and mobile user interface (UI) components. React has one of the largest communities supporting it. The high level component Lifecycle - At the highest level component Lifecycle, React components have lifecycle events that are - 1.       Initialization 2.       State/Property Updates 3.       Destruction Explore to detail understanding   -  React Lifecycle Components Reactjs is very fast technology that can be trusted for complex tasks and can simply be trusted for quality outcomes. 2) When Reactjs released? March 2013 3) What Is the current stable version of ...

SOLID-Liskov Substitution Principle (LSP) Real-Time Example in C#

The SOLID Principles are the design principles that enable us to manage several software design problems. These principles provide us with ways to move from tightly coupled code to loosely coupled and encapsulated real business needs properly. Also readable, adaptable, and scalable code. The SOLID Principles  guide developers as they write readable, adaptable, and scalable code or design an application. The SOLID Principles can be applied to any OOP program. The SOLID Principles were developed by computer science instructor and author Robert C. Martin. Now, SOLID principles have also been adopted in both agile development and adaptive software development. The 5 principles of SOLID are: 1.       Single Responsibility Principle (SRP) 2.       Open-Closed Principle (OCP) 3.       Liskov Substitution Principle (LSP) 4.       Interface Segregation Principle (ISP) 5. ...