Interface not implemented with dependency injection

Question

I have a simple counter app, to which I would like to add a metric by implementing a metrics interface, but I am receiving a not implemented exceptions when using the metric.

using System;
using Foo.Metrics; // This contains the interface "IFooMetrics" and class "MetricCounter"

namespace FooService
{
    class Program
    {
        private static MetricCounter _myMetric;

        public Program(IFooMetrics fooMetrics)
        {
            _myMetric = fooMetrics.CreateMetric();
        }

        static void Main(string[] args)
        {
            var counter = 0;
            var max = args.Length != 0 ? Convert.ToInt32(args[0]) : -1;

            while (max == -1 || counter < max)
            {
                counter++;
                Console.WriteLine($"Counter: {counter}");

                _myMetric.AddToCounter();
                Console.WriteLine("Metric added");

                System.Threading.Tasks.Task.Delay(1000).Wait();
            }
        }
    }
}

Unfortunately my knowledge of Dependency Injection is little, so I don't understand why its not working.

I simply want this metric to be initialized properly, but I am not sure what I'm not doing or doing wrong.

Answer 1

Use simple injector nuget package for example is easy .This is the documentation for simple injector simple injector doc

and here is a simple example example

First of all you must create the class MetricCounter which implement the interface IFooMetrics. Then create a container which register in the class with the interface as the example

private static readonly Container container;



static Program()
{
    container = new Container();

    container.Register<IFooMetrics, MetricCounter >();


    container.Verify();
}

and then in main

var service = container.GetInstance<IFooMetrics>();
service.YourMethod();