Importent Gen_Coverent Example-1, C#

Importent Gen_Coverent Example-1

//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
	public interface IMyCoVarGenIF<out T>
	{

T GetObject();
        T GetObject2();
       // T GetObject2( out T x);
      // void M<V>() where V:T; // Error, covariant T cannot be used as constraint
	}
	
	class MyClass<T> : IMyCoVarGenIF<T> 
	{

T obj;
        public MyClass(){}

public MyClass(T v ) 
		{ 
			obj = v; 
		}

public T GetObject()
		{ 
			return obj; 
		}
        public T GetObject2()
		{ 
			return obj; 
		}

}
    
    class MyClass2<T> : MyClass<T>  
	{

T obj;

public MyClass2(T v ) 
		{ 
			obj = v; 
		}

public T GetObject()
		{ 
			return obj; 
		}
        public T GetObject2()
		{ 
			return obj; 
		}

}
	
	
	class Alpha 
	{

string name;
		public Alpha(string n) 
        { 
            name = n; 
        }

public string GetName()
        { 
            return name;
        }

// ...

}

class Beta : Alpha 
	{

public Beta(string n) : base(n) { }

// ...

}
    class Gama : Beta 
	{

public Gama(string n) : base(n) { }

// ...

}
	
	
	public class Program
	{
		public static void Main(string[] args)
		{
			
            Alpha ap =new Alpha("Alpha #1");
            Beta bt=new Beta("Beta #1");
            Beta bt2=new Beta("Beta #2");
             Gama gm=new Gama("Gama #1");
            string x="10";
            MyClass<Alpha> ap2=new MyClass<Alpha>(bt);
            
            MyClass2<Alpha> ap_2=new MyClass2<Alpha>(ap);
            MyClass2<Alpha> ap_3=new MyClass2<Alpha>(bt);
            MyClass2<Alpha> ap_4=new MyClass2<Alpha>(gm);
            
          //  MyClass2<Beta> bt_2=new MyClass2<Beta>(ap);
            MyClass2<Beta> bt_3=new MyClass2<Beta>(bt);
            MyClass2<Beta> bt_4=new MyClass2<Beta>(gm);
            
          //  MyClass2<Gama> gm_2=new MyClass2<Gama>(ap);
         //   MyClass2<Gama> gm_3=new MyClass2<Gama>(bt);
            MyClass2<Gama> gm_4=new MyClass2<Gama>(gm);
            
            MyClass<Gama> gm_5=new MyClass2<Gama>(gm);
            
           // MyClass2<Alpha> ab_2=new MyClass2<Beta>(ap);
          //  MyClass2<Alpha> ab_3=new MyClass2<Beta>(bt);
           // MyClass2<Alpha> abm_2=new MyClass2<Beta>(gm);
           // MyClass2<Alpha> am_3=new MyClass2<Gama>(bt);
           // MyClass2<Alpha> am_4=new MyClass2<Gama>(gm);
          //  MyClass2<Alpha> am_5=new MyClass2<Gama>(ap);
            //MyClass2<Beta> gm_6=new MyClass2<Gama>(gm);
            //MyClass2<Beta> gm_7=new MyClass2<Gama>(bt);
            
            
            
             // MyClass2<Alpha> ab_2=new MyClass2<Beta>(ap);
          //MyClass<Beta> ab_3=new MyClass2<Beta>(ap);
           // MyClass<Alpha> abm_2=new MyClass2<Beta>(gm);
           // MyClass2<Alpha> am_3=new MyClass2<Gama>(bt);
           // MyClass2<Alpha> am_4=new MyClass2<Gama>(gm);
          //  MyClass2<Alpha> am_5=new MyClass2<Gama>(ap);
            //MyClass2<Beta> gm_6=new MyClass2<Gama>(gm);
            //MyClass2<Beta> gm_7=new MyClass2<Gama>(bt);
            
            
            
            IMyCoVarGenIF<Alpha>apg= new MyClass<Gama>(gm);
            IMyCoVarGenIF<Alpha>apg0= new MyClass<Alpha>(gm);
            IMyCoVarGenIF<Alpha>apg1= new MyClass2<Alpha>(ap);
            IMyCoVarGenIF<Alpha>apg2= new MyClass2<Alpha>(bt);
            IMyCoVarGenIF<Alpha>apg3= new MyClass2<Alpha>(gm);
            //IMyCoVarGenIF<Alpha>apg4= new MyClass2<Gama>(ap);
          //  IMyCoVarGenIF<Alpha>apg5= new MyClass2<Gama>(bt);
            IMyCoVarGenIF<Alpha>apg6= new MyClass2<Gama>(gm);
            IMyCoVarGenIF<Alpha>apg7= new MyClass2<Beta>(bt);
 //           IMyCoVarGenIF<Alpha>apg8= new MyClass2<Beta>(ap);
            IMyCoVarGenIF<Alpha>apg9= new MyClass2<Beta>(gm);
          //  IMyCoVarGenIF<Beta>apg10= new MyClass2<Gama>(bt);
          //  IMyCoVarGenIF<Beta>apg11= new MyClass2<Gama>(ap);
            IMyCoVarGenIF<Beta> apg12= new MyClass2<Gama>(
            );
         //   IMyCoVarGenIF<Gama>apg13= new MyClass2<Gama>(bt);
          //  IMyCoVarGenIF<Gama>apg14= new MyClass2<Gama>(ap);
            IMyCoVarGenIF<Gama>apg15= new MyClass2<Gama>(gm);
            IMyCoVarGenIF<Beta>apg16= new MyClass2<Beta>(bt);
         //   IMyCoVarGenIF<Beta>apg17= new MyClass2<Beta>(ap);
            IMyCoVarGenIF<Beta>apg18= new MyClass2<Beta>(gm);
         
            
            
            
            
            MyClass<Alpha> ap3=new MyClass<Alpha>(ap);
            
           //  MyClass<Beta> ap4=new MyClass<Beta>(ap);
            
             MyClass<Beta> ap5=new MyClass<Beta>(bt);
            
           //  MyClass<Beta> ap8=new MyClass<Beta>(ap2);
            
            // MyClass<Beta> ap6=new MyClass<Alpha>(ap);
            
            // MyClass<Beta> ap7=new MyClass<Alpha>(bt);
            Console.WriteLine(ap2.GetObject2()+"/ "+ap3.GetObject2()+"/ "+ap5.GetObject2()/*+" "+ap8.GetObject2()*/);
            
            IMyCoVarGenIF<Alpha> AlphaRef =	new MyClass<Alpha>(ap);

Console.WriteLine(AlphaRef.GetObject().GetName());
            
            //Console.WriteLine(AlphaRef.GetObject2().GetName());

IMyCoVarGenIF<Beta>BetaRef2 =new MyClass<Beta>(bt);

Console.WriteLine(BetaRef2.GetObject().GetName());
            
			AlphaRef = new MyClass<Beta>(bt2);

Console.WriteLine(AlphaRef.GetObject().GetName());
            
            
            
        }
	}
}


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