How to setup DI in Sitecore using Sitecore Dependency Injection

1. Create Interface with required method(s)
2. Create Model with required properties
3. Create Repository Class that inherits the Interface created
4. Create Controller
5. Inject the dependency as constructor injection
6. Create service for the controller, Repository and Interface in service collection using DI
7. Create the view file to bind the model data
8. Register the DI in sitecore using patch config
9. Finally create your controller rendering in the sitecore and test, everything should work now.

      Create Interface with required method(s)

using Feature.WeatherForecast.Models;

namespace Feature.WeatherForecast.Interfaces

{

    public interface IWeatherForecastRepository

    {

        ForecastData IsCloudy();

    }

}

Create Model with required properties

namespace Feature.WeatherForecast.Models

{

    public class ForecastData

    {

        public bool IsCloudy { get; set; }

    }

}

Create Repository Class that inherits the Interface created

using Feature.WeatherForecast.Interfaces;

using Feature.WeatherForecast.Models;

namespace Feature.WeatherForecast.Repositories

{

    public class WeatherForecastRepository : IWeatherForecastRepository

    {

        public ForecastData IsCloudy()

        {

            return new ForecastData { IsCloudy = true };

        }

    }

}

Create Controller

using Feature.WeatherForecast.Interfaces;

using Sitecore.XA.Foundation.Mvc.Controllers;

using System.Web.Mvc;

namespace Feature.WeatherForecast.Controllers

{

    public class WeatherForecastController : StandardController

    {

        

    }

}

Inject the dependency as constructor injection

using Feature.WeatherForecast.Interfaces;

using Sitecore.XA.Foundation.Mvc.Controllers;

using System.Web.Mvc;

namespace Feature.WeatherForecast.Controllers

{

    public class WeatherForecastController : StandardController

    {

        private readonly IWeatherForecastRepository _repository;

        public WeatherForecastController(IWeatherForecastRepository repository)

        {

            _repository = repository;

        }

        public ActionResult GetWeatherForecast()

        {

            var data = _repository.IsCloudy();

            return View("~/Views/WeatherForecast/GetWeatherForecast.cshtml", data);

        }

    }

}

Create service for the controller, Repository and Interface in service collection using DI

using Feature.WeatherForecast.Controllers;

using Feature.WeatherForecast.Interfaces;

using Feature.WeatherForecast.Repositories;

using Microsoft.Extensions.DependencyInjection;

using Sitecore.DependencyInjection;

namespace Feature.WeatherForecast

{

    public class Configurator : IServicesConfigurator

    {

        public void Configure(IServiceCollection serviceCollection)

        {

            serviceCollection.AddTransient<WeatherForecastController>();

            serviceCollection.AddTransient<IWeatherForecastRepository, WeatherForecastRepository>();

        }

    }

}

Create the view file to bind the model data

@using Feature.WeatherForecast.Models

<div>@Model.IsCloudy</div>

Register the DI in sitecore using patch config

<?xml version="1.0"?>

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">

  <sitecore>

    <services>

      <configurator type="Feature.WeatherForecast.Configurator, Feature.WeatherForecast" />

    </services>

  </sitecore>

</configuration>