.net core3.0 使用Autofac實現自動注入

大多時候我們采用一下方式進行依賴注入

 

 隨着業務的增長，接口跟實現類會越來越多，還需要手動一個個的注冊依賴項，有時候會出現忘了寫配置，導致程序報錯，如果是多人開發，可能還會導致代碼沖突，后期維護起來相對來說比較麻煩。

使用Autofac自動注入

1、安裝Autofac.Extensions.DependencyInjection

2、修改Program.cs

 public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                })
               .UseServiceProviderFactory(new AutofacServiceProviderFactory());

3、在Startup.cs中添加ConfigureContainer方法

 public void ConfigureContainer(ContainerBuilder builder)
        {
            builder.RegisterAssemblyTypes(typeof(Program).Assembly)
                    .Where(x => x.Name.EndsWith("service", StringComparison.OrdinalIgnoreCase)).AsImplementedInterfaces();
        }

接口層以I開頭Service層都要以Service為結尾。

測試：

 public interface IArticleService
    {
        IEnumerable<Article> QueryArticle();

        int SaveArticle(Article article);

        Article GetArticleById(int Id);

        Page<Article> GetArticlePage(int page, int size, string searchval);

        int DelArticle(int Id);
    }

 public class ArticleService : BaseService, IArticleService
    {
        /// <summary>
        /// 查詢文章
        /// </summary>
        /// <returns></returns>
        public Article GetArticleById(int Id)
        {
            var sql = Sql.Builder.Append("SELECT * FROM MST_ARTICLE WHERE Id=@id", new
            {
                id = Id
            });
            return database.SingleOrDefault<Article>(sql);
        }
}

在控制器中注入IArticleService

 [ApiController]
    [Route("api/[controller]/[action]")]
    public class ArticleController : Controller
    {
        private IArticleService _articleService;

        private readonly IMapper _mapper;

        public ArticleController(IArticleService articleService, IMapper mapper)
        {
            _articleService = articleService;
            _mapper = mapper;
        }