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C#

interface

An interface contains only the signatures of methods, properties, events or indexers. A class or struct that implements the interface must implement the members of the interface that are specified in the interface definition. In the following example, class ImplementationClass must implement a method named SampleMethod that has no parameters and returns void.

Syntax:

interface functionName(parameter_list)
{
//body
}

Example:

using System;

interface IPerl
{
    void Read();
}

class Test : IPerl
{
    public void Read()
    {
	Console.WriteLine("Read");
    }
}

class Program
{
    static void Main()
    {
	IPerl perl = new Test(); // Create instance.
	perl.Read(); // Call method on interface.
    }
}

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