using System;

public class Program

{

    public static void Main()

    {

        ChartCreator chartCreator = new ChartCreator();

        for (int i = 1; i <= 2; i++)

        {

            var chart = chartCreator.GetChart(i);

            Console.WriteLine("Where id = {0}, chart = {1} ", i, chart.GenerateChart());

        }

    }

}

​

​

public interface IChart

{

    string GenerateChart();

}

​

public class BarChart : IChart

{

    public string GenerateChart()

    {

        return "Generating BarChart.";

    }

}

public class PieChart : IChart

{

    public string GenerateChart()

    {

        return "Generating PieChart.";

    }

}

​

public interface IChartCreator

{

    IChart GetChart(int id);

}

​

public class ChartCreator : IChartCreator

{

    public IChart GetChart(int id)

    {

        IChart chart = null;

        switch (id)

        {

            case (int)ChartType.BarChart:

            chart = new BarChart();

            break;

            case (int)ChartType.PieChart:

            chart = new PieChart();

            break;

        }

        return chart;

    }

}

​

public enum ChartType

{

    BarChart = 1,

    PieChart = 2

}