NetCore3.0实现自定义IOC容器注入

在之前的ASP.NET MVC实现依赖注入一文中，通过替换默认的ControllerFactory来达到对Controller生命周期的拦截，实现自定义的对象注入，在NetCore3.0中需要重新实现，步骤如下：

1.获取所有相关业务程序集

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public static List<Assembly> GetFrameworkAssemblys()       {           var list = new List<Assembly>();           var deps = DependencyContext.Default;           var libs = deps.CompileLibraries;           foreach (var lib in libs)           {               if (!lib.Serviceable && lib.Type != "package" && lib.Name.StartsWith("FastCloud"))               {                   var assembly = AssemblyLoadContext.Default.LoadFromAssemblyName(new AssemblyName(lib.Name));                   list.Add(assembly);               }           }           return list;       }

2.对所有Component组件注册

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public class InjectContext     {         private static ContainerBuilder Container;         public static void Init()         {             InjectFrameWork();         }           public static void InjectFrameWork()         {             Container = new ContainerBuilder();             //获框架取所有程序集             List<Assembly> assemblies = CloudUtil.GetFrameworkAssemblys();             //注入框架所有Component组件             Container.RegisterAssemblyTypes(assemblies.ToArray(), typeof(Component), true);             Container.Build(CotainerEnum.BuidlModel.OverWrite);         }           public static object Resolve(Type Type, CotainerEnum.TypeEqual TypeEqual = CotainerEnum.TypeEqual.Ref)         {             return Container.Resolve(Type, TypeEqual);         }           public static List<Type> GetRegistType(Type @Type)         {             return Container.GetRegistType(@Type);         }     }

3.实现自定义Controller工厂

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public class CloudControllerActivator : IControllerActivator     {         public object Create(ControllerContext context)         {             if (context == null)             {                 throw new ArgumentNullException(nameof(context));             }               if (context.ActionDescriptor == null)             {                 throw new ArgumentException(nameof(ControllerContext.ActionDescriptor));             }               var controllerTypeInfo = context.ActionDescriptor.ControllerTypeInfo;               if (controllerTypeInfo == null)             {                 throw new ArgumentException(nameof(context.ActionDescriptor.ControllerTypeInfo));             }               Type controllerType = controllerTypeInfo.AsType();             return InjectContext.Resolve(controllerType);         }           public void Release(ControllerContext context, object controller)         {             if (context == null)             {                 throw new ArgumentNullException(nameof(context));             }               if (controller == null)             {                 throw new ArgumentNullException(nameof(controller));             }               var disposable = controller as IDisposable;             if (disposable != null)             {                 disposable.Dispose();             }           }     }

4.修改配置，使用自定义Controller工厂

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//替换默认Controller工厂 var defaultActivator = services.FirstOrDefault(c => c.ServiceType == typeof(IControllerActivator)); if (defaultActivator != null) {     services.Remove(defaultActivator); } services.AddSingleton<IControllerActivator, CloudControllerActivator>();