.net core3.0 使用Autofac实现自动注入

大多时候我们采用一下方式进行依赖注入

随着业务的增长，接口跟实现类会越来越多，还需要手动一个个的注册依赖项，有时候会出现忘了写配置，导致程序报错，如果是多人开发，可能还会导致代码冲突，后期维护起来相对来说比较麻烦。

使用Autofac自动注入

1、安装Autofac.Extensions.DependencyInjection

2、修改Program.cs

1  public static IHostBuilder CreateHostBuilder(string[] args) =>
2             Host.CreateDefaultBuilder(args)
3                 .ConfigureWebHostDefaults(webBuilder =>
4                 {
5                     webBuilder.UseStartup<Startup>();
6                 })
7                .UseServiceProviderFactory(new AutofacServiceProviderFactory());

3、在Startup.cs中添加ConfigureContainer方法

1  public void ConfigureContainer(ContainerBuilder builder)
2         {
3             builder.RegisterAssemblyTypes(typeof(Program).Assembly)
4                     .Where(x => x.Name.EndsWith("service", StringComparison.OrdinalIgnoreCase)).AsImplementedInterfaces();
5         }

接口层以I开头Service层都要以Service为结尾。

测试：

 1  public interface IArticleService
 2     {
 3         IEnumerable<Article> QueryArticle();
 4 
 5         int SaveArticle(Article article);
 6 
 7         Article GetArticleById(int Id);
 8 
 9         Page<Article> GetArticlePage(int page, int size, string searchval);
10 
11         int DelArticle(int Id);
12     }

 1  public class ArticleService : BaseService, IArticleService
 2     {
 3         /// <summary>
 4         /// 查询文章
 5         /// </summary>
 6         /// <returns></returns>
 7         public Article GetArticleById(int Id)
 8         {
 9             var sql = Sql.Builder.Append("SELECT * FROM MST_ARTICLE WHERE Id=@id", new
10             {
11                 id = Id
12             });
13             return database.SingleOrDefault<Article>(sql);
14         }
15 }

在控制器中注入IArticleService

 1  [ApiController]
 2     [Route("api/[controller]/[action]")]
 3     public class ArticleController : Controller
 4     {
 5         private IArticleService _articleService;
 6 
 7         private readonly IMapper _mapper;
 8 
 9         public ArticleController(IArticleService articleService, IMapper mapper)
10         {
11             _articleService = articleService;
12             _mapper = mapper;
13         }