Exemplo n.º 1
0
    static void Main()
    {
        B[] data1 = new B[] { new B(), new B(), new B() };
        B[] data2 = new B[] { new C(), new B(), new C() };
        C[] data3 = new C[] { new C(), new C(), new C() };

        List <B> list1 = new List <B>(data1);
        List <C> list3 = new List <C>(data3);

        ArraysVariance.ShowBs(data1);
        ArraysVariance.ShowBs(data2);
        ArraysVariance.ShowBs(data3);

        ArraysVariance.ReplaceB(data1, new B());
        ArraysVariance.ReplaceB(data1, new C());
        ArraysVariance.ReplaceB(data3, new C());
        try
        {
            ArraysVariance.ReplaceB(data3, new B());
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }

        GenericsInvariance.ShowListOfBs(list1);
        //GenericsInvariance.ShowListOfBs(list3);

        DelegatesVariance.CreateAndShow(DelegatesVariance.makeB);
        DelegatesVariance.CreateAndShow(DelegatesVariance.makeC);

        DelegatesVariance.CallUseB(DelegatesVariance.PrintA, new C());
        DelegatesVariance.CallUseB(DelegatesVariance.PrintB, new C());
        //DelegatesVariance.CallUseB(DelegatesVariance.PrintC, new B());
    }
Exemplo n.º 2
0
    static void Main()
    {
        B[] data1 = new B[] { new B(), new B(), new B() };
        B[] data2 = new B[] { new C(), new B(), new C() };
        C[] data3 = new C[] { new C(), new C(), new C() };

        List <B> list1 = new List <B>(data1);
        // List<B> list2 = new List<C>(data3); // List<C> is not a List<B>
        List <C> list3 = new List <C>(data3);

        ArraysVariance.ShowBs(data1);
        ArraysVariance.ShowBs(data2);
        ArraysVariance.ShowBs(data3); // C[] is a B[] (for reading)

        Console.WriteLine();

        ArraysVariance.ReplaceB(data1, new B());
        ArraysVariance.ReplaceB(data1, new C());
        ArraysVariance.ReplaceB(data3, new C());
        try
        {
            ArraysVariance.ReplaceB(data3, new B()); // C[] is not a B[] for writing
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }

        Console.WriteLine();

        GenericsInvariance.ShowListOfBs(list1);
        // GenericsInvariance.ShowListOfBs(list3); // List<C> is not a List<B>

        Console.WriteLine();

        // DelegatesVariance.CreateAndShow(DelegatesVariance.makeA);
        DelegatesVariance.CreateAndShow(DelegatesVariance.makeB);
        DelegatesVariance.CreateAndShow(DelegatesVariance.makeC);

        Console.WriteLine();

        DelegatesVariance.CallConsumeB(DelegatesVariance.PrintA, new C());
        DelegatesVariance.CallConsumeB(DelegatesVariance.PrintB, new C());
        //DelegatesVariance.CallConsumeB(DelegatesVariance.PrintC, new B());
    }