using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}

​

public class ReportFactory<TViewModel> : IReportFactory<TViewModel> where TViewModel : class

{

    public IReport Create(TViewModel viewModel, EmailQueueTypeCode typeCode)

    {

        switch (typeCode)

        {

            case EmailQueueTypeCode.HSR:

                return new HorseShowReport();

            // list different report here..

            default:

                throw new ArgumentOutOfRangeException(nameof(typeCode), typeCode, null);

        }

    }

}

​

public interface IReportFactory<in TViewModel>

    where TViewModel : class

{

    IReport Create(TViewModel viewModel, EmailQueueTypeCode typeCode);

}

​

public abstract class Report : IReport

{

    public abstract void Generate();

}

​

public interface IReport

{

    void Generate();    

}

​

public enum EmailQueueTypeCode

{

    SCC,

    HSR

}

​

public class HorseShowReport : Report

{

    public override void Generate()

    {

    }

}