using System;

public class Program

{

    public static void Main()

    {

        var context = new OperationContext();

        var entityContext = new EntityOperationContext();

        PrintTest(context);

        PrintTest(entityContext);

    }

    public static void PrintTest(IOperationContext context) {

        if(context is IEntityOperationContext) {

            var entityContext = context as IEntityOperationContext;

            Console.WriteLine(entityContext.getEntityTest());

            Console.WriteLine(entityContext.getTest());

        }

        else {

            Console.WriteLine(context.getTest());

        }

    }

    public interface IOperationContext {

        public string getTest();

    }

    public interface IEntityOperationContext : IOperationContext {

        public string getEntityTest();

    }

    public class EntityOperationContext: IEntityOperationContext {

         public string getEntityTest() {

             return "IEntityOperationContext: Entity context test";

         }

         public string getTest() {

             return "IEntityOperationContext: Context test";

         }

    }

    public class OperationContext: IOperationContext {

         public string getTest() {

             return "IOperationContext: Context test";

         }

    }

}

​