Autofac属性方法注入

添加Autofac和Autofac.Extensions.DependencyInjection包

使用autofac替换内部IOC

.UseServiceProviderFactory(new AutofacServiceProviderFactory());

  public interface ICompanyService 
    {
        public int GetId(int id);
    }
public interface ISysUserService 
    {
        public int GetId(int id);
    }
 public class CompanyService : ICompanyService
    {
        /// <summary>
        /// 这里是一个属性：如果支持属性注入---CompanyService构造完成以后，要吧这个属性的实例构建出来；
        /// </summary>
        [CustomProperty]
        public ISysUserService _ISysUserService { get; set; }
         
        public ISysUserService _ISysUserServiceNoAttribute { get; set; }

        public ISysUserService _ISysUserServiceCtor = null;
        public CompanyService(ISysUserService iSysUserService)
        {
            _ISysUserServiceCtor = iSysUserService;
        }
         
        public ISysUserService _ISysUserServiceMethod = null;

        public void SetService(ISysUserService iSysUserService)
        {
            _ISysUserServiceMethod = iSysUserService;
        }


        public int GetId(int id)
        {
            return id;
        }
    }

public class SysUserService : ISysUserService
    {
        public SysUserService()
        {
            Console.WriteLine($"{GetType().Name}被构造。。。。");
        }

        public int GetId(int id)
        {
            return 1;
        }
    }

//添加属性注入时使用的属性
 [AttributeUsage(AttributeTargets.Property)]//为了支持属性注入，只能标记在属性上
    public class CustomPropertyAttribute : Attribute
    {
    }
  /// <summary>
    /// IPropertySelector:查看 属性上是否标记某一个特性
    /// </summary>
    public class CustomPropertySelector : IPropertySelector
    {
        public bool InjectProperty(PropertyInfo propertyInfo, object instance)
        {
            //需要一个判断的维度；  如果标记的有CustomPropertyAttribute特性 返回True：返回true；就构造实例
            return propertyInfo.CustomAttributes.Any(it => it.AttributeType == typeof(CustomPropertyAttribute));
        }
    }

注册服务
   public void ConfigureContainer(ContainerBuilder containerBuilder)
        {

            //如果要注册某一个Dll中的服务；可以通过反射把dll加载进来；然后再读取出来抽象和具体；然后逐个注册进去；

            //注册服务
            containerBuilder.RegisterType<CompanyService>()
                .OnActivated(e => e.Instance.SetService(e.Context.Resolve<ISysUserService>())) //方法注入--再获取实例后，把指定的某一个方法给执行以下
                .As<ICompanyService>()
                .PropertiesAutowired(new CustomPropertySelector());  //Autoafc自己来调用的这个方法


            containerBuilder.RegisterType<SysUserService>().As<ISysUserService>();
        }