Explicit Keyword in C#

Yesterday, I have written a blog post about Implicit Keyword in C#. In today’s post we are going to learn about Explicit keyword in C#. Like Implicit keyword explicit keyword is also used for typecasting one class into another class. It is also a type conversion operator but rather then directly invoking it will invoke by cast.

As per MSDN, The Explicit keyword declares a user defined type conversation operator that must be invoked with cast.

Usage of explicit operator in C#:

Let’s take a simple example. Following is a code for that.

using System;

namespace ExplicitOperatorDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            User user=new User
            {
                    FirstName = "Jalpesh",
                    LastName = "Vadgama"
            };

            Employee employee = (Employee) user;

            Console.WriteLine(employee.FirstName);
            Console.WriteLine(employee.LastName);
            Console.ReadKey();
        }
    }

    public class Employee
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }

    public class User
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }

        public static explicit operator Employee(User user)
        {
            Employee employee=new Employee
            {
                    FirstName = user.FirstName, 
                    LastName = user.LastName
            };
            return employee;

        }
    }
}

I have written almost same code as we have written for implicit operator. Same two classes “Emplyee” and “User” with first name and last name operator. The only difference is I have written explicit keyword instead of implicit. And same way I have used casting in main function of console application.

In main function I have initialized class “User” with first name and last name and then type cast that in Employee class object.  Following is out put as expected.

That’s it. It is very easy. Hope you like it. Stay tuned for more..

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Launching DotNetJalps Communities

Everyday I got lots of emails asking about technical things and Every time I am trying to give proper answer to them. But due to lack of time it was always not possible to reply all the emails as I have professional commitments also. So that’s why I decided to launch DotNetJalps community where people can ask questions and If I am not there then also another people can answer the question. Another benefit of communities will be the solution given in that particular answer will be visible to all the users of community.
So I have created Google+ community for that. Following is a link for that.

https://plus.google.com/communities/109749681215763540822

I request to ask your questions there instead of sending me emails and I would also encourage you participate in discussion. I am also going to share all my blog post there. You guys can also share your links and discuss various technology related things.

But please make sure there should technology related things only. So please join my community ask question and give answer to people.

Stay tuned for more!!

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Implicit Keyword in C#

In today’s post we are going to learn about implicit operator in C#. Implicit keyword is used for conversation in C#. It is used to declare an implicit user-defined type conversation operator. So with the help of implicit keyword you can convert one class into another class without writing any other syntax.

You can find more information about Implicit from following MSDN link.
http://msdn.microsoft.com/en-us/library/z5z9kes2.aspx

Usage of Implicit Keyword in C#:

Sounds interesting!! Let’s take a example of implicit operator in so that it will be much clear. Following is a code for that.

using System;

namespace ImplicitOpeartorDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            User user=new User
            {
                    FirstName = "Jalpesh",
                    LastName = "Vadgama"
            };

            Employee employee = user;

            Console.WriteLine(employee.FirstName);
            Console.WriteLine(employee.LastName);
            Console.ReadKey();
        }
    }

    public class Employee
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }

    public class User
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }

        public static implicit operator Employee(User user)
        {
            Employee employee=new Employee
            {
                    FirstName = user.FirstName, 
                    LastName = user.LastName
            };
            return employee;

        }
    }
}

In above code I have created two classes “User” and “Employee”. Both contains two properties FirstName and LastName. Also in user class I have defined implicit operator Employee which convert user object into employee object.

In main function I have created object of user with first name as “Jalpesh” and last name as “Vadgama” and then assign it to Employee class. So when you assign object to employee class it will call Employee operator with implicit keyword and convert that user object into employee object.

At the end I have printed first name and last name property of Employee class and following is output as expected.



That’s it. It’s very easy. Hope you like it. Stay tuned for more.. Happy programming.

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