Autofac配置

ASP.NET Core提供依赖注入，但对于稍复杂一些的情况，用Autofac更友好。

Startup添加以下代码

 1         public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
 2         {
 3             ……
 4             this.AutofacContainer = app.ApplicationServices.GetAutofacRoot();
 5         }
 6 
 7         public ILifetimeScope AutofacContainer { get; private set; }
 8 
 9         // ConfigureContainer is where you can register things directly
10         // with Autofac. This runs after ConfigureServices so the things
11         // here will override registrations made in ConfigureServices.
12         // Don't build the container; that gets done for you by the factory.
13         public void ConfigureContainer(ContainerBuilder builder)
14         {
15             // Register your own things directly with Autofac here. Don't
16             // call builder.Populate(), that happens in AutofacServiceProviderFactory
17             // for you.
18             builder.RegisterModule(new ServiceModule());
19         }
20 
21         class ServiceModule : Autofac.Module
22         {
23             protected override void Load(ContainerBuilder builder)
24             {
25                 var bll = Assembly.Load(new AssemblyName("Square.Service"));
26                 builder.RegisterAssemblyTypes(bll)
27                        .Where(t => t.Name.EndsWith("Service"))
28                        .AsImplementedInterfaces();
29             }
30         }

Program添加.UseServiceProviderFactory(new AutofacServiceProviderFactory())

Host.CreateDefaultBuilder(args)
                .UseServiceProviderFactory(new AutofacServiceProviderFactory())
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });

Areas配置

1. 新建区域后要在Startup.Config内增加区域路由配置

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    name: "System",
                    pattern: "{area:exists}/{controller}/{action=Index}/{id?}");
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller=Login}/{action=Index}/{id?}");
            });

　　2. 在控制器头上标记Areas特性

[Area("System")]
public class RoleController : Controller

注意：Views等静态文件的Build Action应为Content

初始化数据库

1. 创建数据库和架构（.NET Core CLI）
   1. cd DbContext所在项目
   2. dotnet ef migrations add InitialCreate
   3. dotnet ef database update
2. 数据种子初始化数据（在本地调试，或引用dll完成，只在程序运行第一次时使用）

namespace MvcMovie.Models
{
    public static class SeedData
    {
        public static void Initialize(IServiceProvider serviceProvider)
        {
            using (var context = new MvcMovieContext(
                serviceProvider.GetRequiredService<
                    DbContextOptions<MvcMovieContext>>()))
            {
                // Look for any movies.
                if (context.Movie.Any())
                {
                    return;   // DB has been seeded
                }

                context.Movie.AddRange(
                    new Movie
                    {
                        Title = "When Harry Met Sally",
                        ReleaseDate = DateTime.Parse("1989-2-12"),
                        Genre = "Romantic Comedy",
                        Price = 7.99M
                    },
                    new Movie
                    {
                        Title = "Ghostbusters ",
                        ReleaseDate = DateTime.Parse("1984-3-13"),
                        Genre = "Comedy",
                        Price = 8.99M
                    }
                );
                context.SaveChanges();
            }
        }
    }
}

public class Program
    {
        public static void Main(string[] args)
        {
            var host = CreateHostBuilder(args).Build();

            using (var scope = host.Services.CreateScope())
            {
                var services = scope.ServiceProvider;

                try
                {
                    SeedData.Initialize(services);
                }
                catch (Exception ex)
                {
                    var logger = services.GetRequiredService<ILogger<Program>>();
                    logger.LogError(ex, "An error occurred seeding the DB.");
                }
            }

            host.Run();

        }

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

参考链接：

https://docs.microsoft.com/zh-cn/aspnet/core/tutorials/first-mvc-app/working-with-sql?view=aspnetcore-5.0&tabs=visual-studio

https://docs.autofac.org/en/latest/integration/aspnetcore.html#asp-net-core-3-0-and-generic-hosting