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Internal Class In C#

In this article, we will discuss internal classes in C#

Purpose

Internal classes are those that can be accessed by the files in the same assembly.

Example

In this example, we will take 3 projects

2 class library projects
1 console application.

In first class library project, I have written following code

namespace Another_Lib { 
    public class LIB1 {} 
}

In second class library project, I have written following code

namespace Internal_demo { 
    internal class LIB2 { 
        public LIB2() { 
  
                } 
    } 
}

Compile both the projects to ensure there is no error.

Using Dlls In Console Application

First, add reference of both DLLs in console application. After that, write following code in console application

using Another_Lib; 
using Internal_demo; 
namespace Consumer { 
    class Program { 
        static void Main(string[] args) { 
            LIB1 l1 = new LIB1(); 
            LIB2 l2 = new LIB2(); 
        } 
    } 
}

Once you compile the application, you will get following error – ‘'Internal_demo.LIB2' is inaccessible due to its protection level’.

The reason is, you are using internal class LIB2 outside the class library project.

Posted By -	Karan Gupta

Posted On -	Monday, December 18, 2017

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