C# invoke C++ method

1. Platform Invocation (P/Invoke)

Set C++ project as dll, compile, copy compiled c++ dll to C# bin/debug matched location

 

 

 

//C++
// ConsoleApplication1.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>

extern "C"
{
    __declspec(dllexport) int AddNumbers(int a, int b)
    {
        return a + b;
    }

    __declspec(dllexport) double CalculateAverage(double* numbers, int count)
    {
        double sum = 0.0;
        for (int i = 0; i < count; i++)
        {
            sum += numbers[i];
        }
        return sum / count;
    }
}
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file

 

 

using System;
using System.Runtime.InteropServices;

namespace ConsoleApp3
{
    internal class Program
    {
        [DllImport("ConsoleApplication1.dll")]

        public static extern int AddNumbers(int a, int b);

        [DllImport("ConsoleApplication1.dll")]
        public static extern double CalculateAverage(double[] numbers, int count);

        static void Main(string[] args)
        {
            int result = AddNumbers(5, 100);
            Console.WriteLine($"Result:{result}");

            double[] numbers = { 4.5, 5346.5, 2453465.4, 675467.7 };
            double average=CalculateAverage(numbers,numbers.Length);
            Console.WriteLine($"Average:{average}");
        }
    }
}