一、背景

　　剛接觸.net 6，記錄一下在.net6上是怎么使用Autofac進(jìn)行動(dòng)態(tài)的依賴注入的

二、注入方式

　　1、新建一個(gè)webapi項(xiàng)目，框架選擇net 6

　　2、引用Nuget包---Autofac.Extensions.Dependency　　

　　3、在Program.cs上添加如下代碼

//依賴注入
builder.Host.UseServiceProviderFactory(new AutofacServiceProviderFactory())//注冊(cè)服務(wù)工廠
.ConfigureContainer<ContainerBuilder>(container =>
{　　//添加依賴注入，AddModule是一個(gè)自定義的拓展方法，將依賴注入的方法單獨(dú)提取出來，方便管理
    builder.Services.AddModule(container);
});

public static IServiceCollection AddModule(this IServiceCollection services, ContainerBuilder builder, IConfiguration configuration)
        {
	
            //初始化配置文件
            Type baseType = typeof(IDependency);//自定義的空類
            //動(dòng)態(tài)運(yùn)行項(xiàng)目的類庫
            var compilationLibrary = DependencyContext.Default
                .RuntimeLibraries
                .Where(x => !x.Serviceable
                && x.Type == "project")
                .ToList();
            var count1 = compilationLibrary.Count;
            List<Assembly> assemblyList = new List<Assembly>();

            foreach (var _compilation in compilationLibrary)
            {
                try
                {
                    assemblyList.Add(AssemblyLoadContext.Default.LoadFromAssemblyName(new AssemblyName(_compilation.Name)));
                }
                catch (Exception ex)
                {
                    Console.WriteLine(_compilation.Name + ex.Message);
                }
            }
            //注冊(cè)程序集的方式添加依賴
            builder.RegisterAssemblyTypes(assemblyList.ToArray())
             .Where(type => baseType.IsAssignableFrom(type) && !type.IsAbstract)//過濾非抽象類，繼承了IDependency接口的類
             .AsSelf().AsImplementedInterfaces()
             .InstancePerLifetimeScope();//實(shí)例的生命周期
            
            //單獨(dú)注冊(cè)依賴服務(wù)
			//注冊(cè)數(shù)據(jù)庫基礎(chǔ)操作和工作單元
			builder.RegisterGeneric(typeof(BaseRepository<,>)).As(typeof(IRepository<,>));
			builder.RegisterGeneric(typeof(UnitWork<>)).As(typeof(IUnitWork<>));
			 //注冊(cè)app層
			 builder.RegisterAssemblyTypes(Assembly.GetExecutingAssembly());
			
			 builder.RegisterType(typeof(RedisCacheContext)).As(typeof(ICacheContext));
			 
			 
			 
             builder.RegisterType<MemoryCacheService>().As<ICacheService>().SingleInstance();
            
            return services;
        }

4.

或

//依賴注入
builder.Host.UseServiceProviderFactory(new AutofacServiceProviderFactory())

以及再startup.cs中添加ConfigureContainer方法

? ?public void ConfigureContainer(ContainerBuilder builder)
? ?{
? ? ? ?ExtAutofac.InitAutofac(builder);
? ?}

在app層文章來源地址http://www.zghlxwxcb.cn/news/detail-847654.html

namespace App
{
    public static  class ExtAutofac
    {
        private static IContainer _container;
   
        public static void InitAutofac(ContainerBuilder builder)
        {
            
            //注冊(cè)數(shù)據(jù)庫基礎(chǔ)操作和工作單元
            builder.RegisterGeneric(typeof(BaseRepository<,>)).As(typeof(IRepository<,>));
            builder.RegisterGeneric(typeof(UnitWork<>)).As(typeof(IUnitWork<>));

            
            //注冊(cè)app層
            builder.RegisterAssemblyTypes(Assembly.GetExecutingAssembly());
            
            builder.RegisterType(typeof(RedisCacheContext)).As(typeof(ICacheContext));
            builder.RegisterType(typeof(HttpContextAccessor)).As(typeof(IHttpContextAccessor));
            
            InitDependency(builder);

        }


        /// <summary>
        /// 注入所有繼承了IDependency接口
        /// </summary>
        /// <param name="builder"></param>
        private static void InitDependency(ContainerBuilder builder)
        {
            Type baseType = typeof(IDependency);
            var compilationLibrary = DependencyContext.Default
                .CompileLibraries
                .Where(x => !x.Serviceable
                            && x.Type == "project")
                .ToList();
            var count1 = compilationLibrary.Count;
            List<Assembly> assemblyList = new List<Assembly>();

            foreach (var _compilation in compilationLibrary)
            {
                try
                {
                    assemblyList.Add(AssemblyLoadContext.Default.LoadFromAssemblyName(new AssemblyName(_compilation.Name)));
                }
                catch (Exception ex)
                {
                    Console.WriteLine(_compilation.Name + ex.Message);
                }
            }
            
            builder.RegisterAssemblyTypes(assemblyList.ToArray())
                .Where(type => baseType.IsAssignableFrom(type) && !type.IsAbstract)
                .AsSelf().AsImplementedInterfaces()
                .InstancePerLifetimeScope();
        }
    }
}

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