廢話少說，直接上代碼

首先我們得有一個接口類和一個實現類，方便後面註入MVC裏

接口類

    public interface IWeatherProvider
    {
        List<WeatherForecast> GetForecasts();
    }

實現類

public class WeatherProviderFake : IWeatherProvider
    {
        private string[] Summaries = new[]
        {
            "Freezing", "Bracing
 
", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
        };

        private List<WeatherForecast> WeatherForecasts { get; set; }

        public WeatherProviderFake()
        {
            Initialize(50);
        }

        private void Initialize(int quantity)
        {
            
 
var rng = new Random();
            WeatherForecasts = Enumerable.Range(1, quantity).Select(index => new WeatherForecast
            {
                DateFormatted = DateTime.Now.AddDays(index).ToString("d"),
                TemperatureC = rng.Next(-20, 55),
                Summary = Summaries[rng.Next(Summaries.Length)]
            }).ToList();
        }

        
 
public List<WeatherForecast> GetForecasts()
        {
            return WeatherForecasts;
        }

Startup.cs

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();

            // Simple example with dependency injection for a data provider.
            services.AddSingleton<IWeatherProvider, WeatherProviderFake>();
        }

這樣IWeatherProvider就被註入到了mvc裏，我們可以在控制器構造函數裏這麽使用了

        private readonly IWeatherProvider _weatherProvider;

        public HelloController(IWeatherProvider weatherProvider)
        {
            this._weatherProvider = weatherProvider;
        }

源碼暫不開源，有需要看的可以留郵箱。

完美！！！

【.netcore基礎】MVC制器Controller依賴註入