Records

  • Records are immutable by default.
  • All the record members are init-only properties. Below is the screenshot.
				
					Employee emp1 = new Employee() { Empid = 1, EmployeeName = "Rahul", Salary = 10000 };
Employee emp2 = new Employee() { Empid = 1, EmployeeName = "Rahul", Salary = 10000 };
Console.WriteLine(emp1);
Console.WriteLine(emp1 == emp2);



//class Employee
//{
//    public int Empid { get; set; }
//    public string EmployeeName { get; set; }
//    public int Salary { get; set; }
//}


class Employee
{
    public int Empid { get; set; }
    public string? EmployeeName { get; set; }
    public int Salary { get; set; }


    public override bool Equals(object? obj)
    {
        if (obj is null || obj is not Employee)
            return false;

        var otherEmployee = (Employee)obj;

        if (Empid != otherEmployee.Empid || EmployeeName != otherEmployee.EmployeeName || Salary != otherEmployee.Salary)
            return false;

        return true;
    }
    public static bool operator ==(Employee x, Employee y)
    {
        return x.Equals(y);
    }

    public static bool operator !=(Employee x, Employee y)
    {
        return !x.Equals(y);
    }

    public override string ToString()
    {
        return $"Personclass {{Name ={EmployeeName} and Salary = {Salary} }}";
    }
}
				
			
				
					
//1.Records are reference type like class
//2.Immutable
//you cannot change the value once they are set... so it is init only properties
//init only properties can only be set in construtor initialization or object initializer
//3.Faster than classes
//4.Value based comparision
//5.Where to use--> you can use in DTO classes..
//6.No need to ovverideToString() Method as we used to do in classes
//7.No need to ovveride Equals Object...
//8.Inherit a new record from existing record

var employee1 = new EmployeeRecord(1, "Rahul", 1000);
var employee2 = new EmployeeRecord(1, "Rahul", 1000);

//Directly pring
Console.WriteLine(employee1);

//Comparision
Console.WriteLine(employee1 == employee2);

//Inherit using with operator
var employee3 = employee2 with { EmpName = "Vinod", EmpSalary = 2000 };
Console.WriteLine(employee3);

//you cannot change existing property
//employee1.EmpSalary = 4000;

public record EmployeeRecord(int EmplId, string EmpName, int EmpSalary);
  • init only property can only be assigned only in constructor or object-initializer.

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