Asp.net core 学习笔记 ( DI 依赖注入 )

public void ConfigureServices(IServiceCollection services)
{
    services.Configure(Configuration.GetSection("business"));
    services.Configure(Configuration.GetSection("email"));

    services.AddEmail();
    // Razor template 
    services.AddSingleton();
    services.AddSingleton();

    // Entity 
    services.AddScoped(_ => new DB(Configuration.GetConnectionString("DefaultConnection")));

    // hangfire
    services.AddHangfire(config =>
            config.UseSqlServerStorage(Configuration.GetConnectionString("DefaultConnection")));

    // MVC
    services.Configure(options =>
    {
        options.ViewLocationExpanders.Add(new FeatureLocationExpander());
    });
    services.AddMvc();
}

private readonly DB db;
private ICompositeViewEngine CompositeViewEngine { get; set; }
private ActionContext ActionContext { get; set; }
private IServiceProvider ServiceProvider { get; set; }
private ITempDataProvider TempDataProvider { get; set; }
private Configuration.Email EmailConfig { get; set; }

public DebugController(
    DB db,
    ICompositeViewEngine compositeViewEngine,
    IActionContextAccessor actionContextAccessor,
    IServiceProvider serviceProvider,
    ITempDataProvider tempDataProvider,
    IOptionsSnapshot emailOptionsAccessor
)
{
    CompositeViewEngine = compositeViewEngine;
    ActionContext = actionContextAccessor.ActionContext;
    ServiceProvider = serviceProvider;
    TempDataProvider = tempDataProvider;
    EmailConfig = emailOptionsAccessor.Value;
    this.db = db;
}

namespace Project.Email
{
    public static class ServiceCollectionExtensions
    {
        public static IServiceCollection AddEmail(
            this IServiceCollection services)
        {
            services.AddSingleton();
            services.AddSingleton();
            services.AddScoped();
            return services;
        }
    }

    public class EmailService
    {
        public EmailService()
        {


        }

        public string name { get; set; } = "dada";
    }
}