Class Libraries and Reusability in C#

 19th Day

Hey Guys, I hope that you are Enjoying with my blogs in previous block we studied basic of C#, Its Installation, IL code by just in  time make it machine code and Today's we will study about Basic concepts of C#, Class  Libraries and Reusability.

  • .NET is a free, cross-platform, open source developer platform for building many different types of applications.
  • .NET Core is a cross-platform .NET implementation for websites, servers, and console apps on Windows, Linux, and macOS.
  • With .NET, you can use multiple languages, editors, and libraries to build for web, mobile, desktop, games, and IoT.
  • So lets create one console app(.NET core)  project for better understanding to this concept.
  • It is an exe i.e executable. we can double click and execute this folder. 
  • Build now and right click on console app open as an explorer go to bin folder and will get exe folder. 
  • Input:(Program.cs)
using System;
using ClassLibrary1;
namespace ConsoleApp2
{
    class Program
    {
        static void Main(string[] args)
        {
           
            Class1 x = new Class1();// we can call here to class1
            Console.WriteLine(x.Add(10,20));
            // here we giving parameter to add function
            Console.WriteLine("Hello World!");
            Console.Read();
        }
    }
}


  • To make DLL, Will have to create a Class library.
  • DLL stands for dynamic link library it is library that contains function and codes that can used by more than one program at a time. Once we have created DLL we can use in many application. 
  • Input:(Class1.cs)
    using System;

    namespace ClassLibrary1
    {
        public class Class1
        {
            public int Add(int num1, int num2)
            {
                return num1 + num2; 
            }
        }
    }
  • This code we can execute but can't link it.
  • After build it, If we want to see DLL file go to its bin folder then executable file not will show , it show dll(dynamic link library) like given below
  • We can't run this folder by double click because its not an executable it is Dynamic link library.so we can call to its function from another class.
  • For reference to console app ,go to right side-> right click on dependency -> add project reference-> class library.
  • Assembly has two types of library 1. Exe  2. DLL.
  • Output:

                             Must refer this videos for more details:

                                         Thank You...!



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