using Microsoft.CSharp.RuntimeBinder;
using System;
using System.Reflection;

namespace ClientApp
{
    class Program
    {
        private const string CalculatorTypeName = "CalculatorLib.Calculator";

        static void Main(string[] args)
        {
            if (args.Length != 1)
            {
                ShowUsage();
                return;
            }
            UsingReflection();
            UsingReflectionWithDynamic();
        }

        private static void ShowUsage()
        {
            Console.WriteLine($"Usage: {nameof(ClientApp)} path");
            Console.WriteLine();
            Console.WriteLine("Copy CalculatorLib.dll to an addin directory");
            Console.WriteLine("and pass the absolute path of this directory when starting the application to load the library");
        }

        private static void UsingReflectionWithDynamic()
        {
            double x = 3;
            double y = 4;
            dynamic calc = GetCalculator();
            double result = calc.Add(x, y);
            Console.WriteLine($"the result of {x} and {y} is {result}");

            try
            {
                result = calc.Multiply(x, y);
            }
            catch (RuntimeBinderException ex)
            {
                Console.WriteLine(ex);
            }
        }

        private static void UsingReflection()
        {
            double x = 3;
            double y = 4;
            object calc = GetCalculator();

            object result = calc.GetType().GetMethod("Add").Invoke(calc, new object[] { x, y });
            Console.WriteLine($"the result of {x} and {y} is {result}");
        }

        private static object GetCalculator()
        {
            Assembly assembly = Assembly.LoadFile(@"D:\CalculatorLib.dll");
            return assembly.CreateInstance(CalculatorTypeName);
        }
    }
}

 

 

namespace CalculatorLib
{
    // This project can output the Class library as a NuGet Package.
    // To enable this option, right-click on the project and select the Properties menu item. In the Build tab select "Produce outputs on build".
    public class Calculator
    {
        public double Add(double x, double y) => x + y;
        public double Subtract(double x, double y) => x - y;
    }
}

 

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