About Interface

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http://www.codeproject.com/Articles/18743/Interfaces-in-C-For-Beginners

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Interface can‘t have things like int x;

All interface defined function must be realized with public decorator.

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Here is an example for object array

class Demo : abc

{

public static void Main()

{

abc [] refabc = {new Demo(), new Sample()} ;

for (int i = 0; i<= 1; i++)

refabc[i].xyz();

}

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public void xyz()

{

System.Console.WriteLine("In Demo :: xyz");

}

}

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interface abc

{

void xyz();

}

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class Sample : abc

{

public void xyz()

{

System.Console.WriteLine("In Sample :: xyz");

}

}

原文：http://www.cnblogs.com/jiceberg420/p/5015531.html