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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