DOTNET: 2019

Saturday, June 8, 2019

Likes/DisLikes Example with Angular

Step 1:

Download and Install Latest Node.js

URL : https://nodejs.org/en/download/

Step 2:

Install Visual Studio Code (URL: https://code.visualstudio.com/download)

Step 3:

Install Angular CLI Using the command

npm install -g @angular/cli

Create a new Angular Application

Create a New Folder in your System (D:\\AngularApp)

Open folder using Visual Studio Code

Open Terminal Using the Ctrl + ` Type the below Command

ng new cars-demo

Below is the folder Structure you will be seeing.

ng g c carsdemo --spec=false

Now you can see the below files gets created in the folder src\app as shown below

cars-demo.component.ts

import { Component, OnInit } from '@angular/core';

@Component({

selector: 'app-cars-demo',

templateUrl: './cars-demo.component.html',

styleUrls: ['./cars-demo.component.css']

})

export class CarsDemoComponent implements OnInit {

constructor() { }

public cars = [

{carName: 'Audit', Photo: 'assets/Audit.Jpg', Likes: 0, DisLike: 0},

{carName: 'Benz', Photo: 'assets/Benz.Jpg', Likes: 0, DisLike: 0}

];

ngOnInit() {

}

public LikesCounter(car)

{

car.Likes++;

}

public DisLikesCounter(car)

{

car.DisLike++;

}

cars-demo.component.html

<h3> {{ carobj.carName }} </h3>

<br/>

{{carobj.Likes}} | {{ carobj.DisLike}}

<br/>

</a>

</a>

</div>

Note: Add Images in the Asset Folder for displaying of Image as shown below

Now Go to app.module.ts(To make cars binding Component Run we need to make the following Changes)

Now Go to Index Page in the folder and make the below changes.

Output:

Go to Terminal And Type the Command

ng s

Wednesday, June 5, 2019

Data Binding Technique using Interpolation in Angular

Interpolation: It is a data binding technique used by angular to bind the model data into any View. It uses angular Data Binding Expression " { }"

Step 1:

Download and Install Latest Node.js

URL : https://nodejs.org/en/download/

Step 2:

Install Visual Studio Code (URL: https://code.visualstudio.com/download)

Step 3:

Install Angular CLI Using the command

npm install -g @angular/cli

Below is the folder Structure you will be seeing.

Go to that Path and run the below command to create a component using Visual Studio Code

Now you can see the below files gets created in the folder src\app as shown below

data-binding.component.ts

import { Component, OnInit } from '@angular/core';

@Component({
selector: 'app-data-binding',
templateUrl: './data-binding.component.html',
styleUrls: ['./data-binding.component.css']
})

export class DataBindingComponent {

public title = 'Product Details';
public product =
{
Name: 'Samsung TV',
Price: 4500.64,
Qty: 2,
Mfd: new Date('2019/02/20'),
Preview: 'assets/Samsung.JPG'
};
public GetTotal() {
return this.product.Qty * this.product.Price;
}

}

data-binding.component.html

<H1> Data Binding </H1>
<h3> {{ title }} </h3>
<dl>
<dt> Name </dt>
<dd> {{ product.Name }} </dd>
<dt> Price </dt>
<dd> {{ product.Price}}</dd>
<dt> Quantity </dt>
<dd> {{ product.Qty}}</dd>
<dt> Manufactured Date </dt>
<dd> {{ product.Mfd.toLocaleDateString() }} </dd>
<dt> Preview</dt>
<dd>
<img src="{{product.Preview}}" width="100" height="100">
</dd>
<dt> Total Amount</dt>
<dd> {{GetTotal() }}</dd>

</dl>

Note: Add any Image in the Asset Folder for displaying of Image.

Now Go to app.module.ts(To make Data binding Component Run we need to make the following Changes)

Now Go to Index Page in the folder

Output:

Go to Terminal And Type the Command
ng s

Output:

Sunday, February 10, 2019

Expression bodied members in C Sharp 7.0

C# 6.0

Expression bodied Methods
Expression bodied Properties

C# 7.0

Expression bodied constructor

Expression bodied destructor

Expression bodied getters
Expression bodied setters
Expression bodied Events.

Expression bodied Methods:

Let us learn the Previous Release of Expression bodied Method in C sharp 6.0.

Sample Syntax :

public string GetUserDetails

() => $ "{UserId} + {UserName} + {EmailId} + {ContactNumber}";

Example:

class User

    {
        public int UserId { get; set; }
        public string UserName { get; set; }
        public string EmailId { get; set; }
        public string ContactNumber { get; set; }
        public string GetUserDetails() => $"{UserId} + {UserName} + {EmailId} + {ContactNumber}";

    }

    class Program
    {
static void Main(string[] args)        {
            User obj = new User();
            obj.UserId = 001;
            obj.UserName = "Rajakonda Uday Kumar";
            obj.EmailId = "rajakondauday@gmail.com";
            obj.ContactNumber = "123456";
            Console.WriteLine(obj.GetUserDetails());
            Console.ReadLine();
        }
    }

Output:

There might be the situation where we want to override the ToString method in that case
class User
    {
        public int UserId { get; set; }
        public string UserName { get; set; }
        public string EmailId { get; set; }
        public string ContactNumber { get; set; }
        public string GetUserDetails() => $"{UserId} + {UserName} + {EmailId} + {ContactNumber}";
        public override string ToString() => $"{UserId} + {UserName} + {EmailId} + {ContactNumber}";
    }
    class Program
    {
        static void Main(string[] args)
        {
            User obj = new User();
            obj.UserId = 001;
            obj.UserName = "Rajakonda Uday Kumar";
            obj.EmailId = "rajakondauday@gmail.com";
            obj.ContactNumber = "123456";
            Console.WriteLine(obj.ToString());
            Console.ReadLine();
        }
    }

Expression Bodied Properties:

class User
    {
        public int UserId { get; } = 0001;
        public string UserName { get; } = "Rajakonda Uday Kumar";
        public string EmailId { get;} = "rajakondauday@gmail.com";
        public string ContactNumber { get; } = "123456";
        public string GetUserDetails() => $"{UserId} + {UserName} + {EmailId} + {ContactNumber}";
        public override string ToString() => $"{UserId} + {UserName} + {EmailId} + {ContactNumber}";
    }
    class Program
    {
        static void Main(string[] args)
        {
            User obj = new User();
            Console.WriteLine(obj.ToString());
            Console.ReadLine();
        }
    }

In C Sharp 7.0

Expression bodied constructor

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(new User().ContactNumber);
            Console.ReadLine();
        }
    }

Output:

Expression bodied destructor

class User
    {
        public int UserId { get; } = 0001;
        public string UserName { get; } = "Rajakonda Uday Kumar";
        public string EmailId { get;} = "rajakondauday@gmail.com";
        public string ContactNumber { get; }
        public User()=> ContactNumber= "99898955555";
        ~User() => Console.WriteLine("Destructor Method");
    }
    class Program
    {
        static void Main(string[] args)
        {
            Details();
            GC.Collect();
            Console.ReadLine();
        }
        public static void Details()
        {
            Console.WriteLine(new User().ContactNumber);
            User user = new User();
        }
    }

Expression bodied getters & setters

class User
    {
        public Dictionary<int, string> UserList = new Dictionary<int, string>();
        public int UserId { get; } = 101;
        public string UserName { get; } = "Rajakonda Uday Kumar";
        public string EmailId { get;} = "rajakondauday@gmail.com";
        public string ContactNumber { get; }
        public string UserDetails
        {   get => UserList[UserId];
            set => UserList[UserId] = value;
         }
    }
    class Program
    {
        static void Main(string[] args)
        {
            User obj = new User();
            obj.UserList.Add(101, "A");
            obj.UserList.Add(102, "B");
            Console.WriteLine(obj.UserDetails);
            Console.ReadLine();
        }
    }

Examples:

class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine($" {new Employee().EmployeeDetail()}");
            Console.ReadLine();
        }
    }
    class Employee
    {
        int empId { get; } = 101;
        string Name { get; } = "ABC";
        string Address { get; } = "Hyderabad";
        double Salary { get; } = 1000;
        public double HRA() => (Salary * 40) / 100;
        public string EmployeeDetail() => $"EmployeeId: {empId}\n EmployeeName: {Name}\nEmployeeAddress: {Address}\nEmployeeHRA: {HRA()}";
    }

Output:

2) Example:

class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine($" {new Employee().EmployeeDetail()}");
            Console.ReadLine();
        }
    }

    class Employee
    {
        int empId { get; } = 101;
        string Name { get; } = "ABC";
        string Address { get; } = "Hyderabad";
        double Salary { get; } = 1000;
        public Employee() => Salary = 1000;

public double HRA() => (Salary * 40) / 100;
public string EmployeeDetail() => $"EmployeeId: {empId}\n EmployeeName: {Name}\nEmployeeAddress: {Address}\nEmployeeHRA: {HRA()}";

~Employee() => Console.WriteLine("\n Destructor");
}