C# Interface Examples

In C#, an interface is a blueprint of the class. An interface is similar to an abstract class that contains only abstract methods and properties. It is not likely to have a method body or be instantiated. The implementation of the members of an interface is specified by a class that implicitly or explicitly implements the interface. To implement an interface member, the implementing class must be public, non-static, and have the same name and signature as the interface member.

C# Interface Syntax:

interface  <interface_name>
{
    // declare Events, indexers, methods & properties
}

Advantage of C# Interface:

• Interfaces helps to achieve abstraction in C#.
• Interfaces are used to achieve multiple inheritance.
• Interfaces are used to achieve loose coupling.
• Interface defines the rules that a class must work with.
• Interfaces are used to achieve component-based programming.

iList Interface:

iList Interface is a collection of objects that are used to access each element individually using the index.

IDumpable Interface:

IDumpable Interface represents a collection of dumpable objects.

IDumpable Interface:

The IDictionary Interface represents a generic collection of key/value pairs. For each pair, a unique key is required.

IEnumerable Interface:

IEnumerable Interface provides an enumerator, which supports a simple iteration over a non-generic collection.

The following section contains C# programs on interfaces, interface types, interface properties, iList Interface, iDictionary Interface, IComparable Interface, and IDumpable Interface. Every example program includes the problem description, problem solution, C# code, program explanation, and run-time test cases. All C# Interface Examples have been compiled and tested on Visual Studio.

Here is the listing of C# Interface programs with examples:

/*
 *  C# Program to Demonstrate iList Interface
 */
using System;
using System.Collections.Generic;
 
class Program
{
    static void Main()
    {
        int[] a = new int[3];
        a[0] = 1;
        a[1] = 2;
        a[2] = 3;
        Display(a);
 
        List<int> list = new List<int>();
        list.Add(5);
        list.Add(7);
        list.Add(9);
        Display(list);
        Console.ReadLine();
    }
 
    static void Display(IList<int> list)
    {
        Console.WriteLine("Count: {0}", list.Count);
        foreach (int num in list)
        {
            Console.WriteLine(num);
        }
    }
}