【EF Core】实体类的依赖注入（转）

最新推荐文章于 2025-12-15 13:40:30 发布

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最新推荐文章于 2025-12-15 13:40:30 发布 · 563 阅读

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#java #前端 #数据库

实体类也支持依赖注入，不过，目前版本只支持注入 EF Core 自己的服务类型，你在代码中添加的应用程序级服务类型不能注入（以后可能会支持）。总结一下，以下服务类型可以注入：

1、EF Core 框架内部注册的服务类型；

2、三个补充类型：

　　a、当前 DbContext 实例（你从 DbContext 派生的类）；

　　b、当前实体相关的 IEntityType，可以获取实体模型相关信息；

　　c、ILazyLoader 接口，延时加载时用得上。

现在要解决一个问题：我怎么知道 EF Core 框架内部哪些服务可以注入？这个活儿有两个方案：第一个方案是看 EF Core 源代码，在 EFCore\Infrastructure 下，注意看 EntityFrameworkServicesBuilder 类的 CoreServices 字段或 TryAddCoreServices 方法，基本齐全了。

    public static readonly IDictionary<Type, ServiceCharacteristics> CoreServices
        = new Dictionary<Type, ServiceCharacteristics>
        {
            { typeof(LoggingDefinitions), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IDatabaseProvider), new ServiceCharacteristics(ServiceLifetime.Singleton, multipleRegistrations: true) },
            { typeof(IDbSetFinder), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IDbSetInitializer), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IDbSetSource), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IEntityFinderSource), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IStructuralTypeMaterializerSource), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(ITypeMappingSource), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IModelCustomizer), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IModelCacheKeyFactory), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IModelSource), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IModelRuntimeInitializer), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IInternalEntrySubscriber), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IEntityEntryGraphIterator), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IValueGeneratorCache), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(ISingletonOptionsInitializer), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(ILoggingOptions), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(ICoreSingletonOptions), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IModelValidator), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(ICompiledQueryCache), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IValueConverterSelector), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IConstructorBindingFactory), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IRegisteredServices), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IPropertyParameterBindingFactory), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IParameterBindingFactories), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IMemberClassifier), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IMemoryCache), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IEvaluatableExpressionFilter), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(INavigationExpansionExtensibilityHelper), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(ILiftableConstantFactory), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IExceptionDetector), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IJsonValueReaderWriterSource), new ServiceCharacteristics(ServiceLifetime.Singleton) },
            { typeof(IProviderConventionSetBuilder), new ServiceCharacteristics(ServiceLifetime.Scoped) },
            { typeof(IConventionSetBuilder), new ServiceCharacteristics(ServiceLifetime.Scoped) },
            { typeof(IDiagnosticsLogger<>), new ServiceCharacteristics(ServiceLifetime.Scoped) },
            { typeof(IInterceptors), new ServiceCharacteristics(ServiceLifetime.Scoped) },
            { typeof(ILoggerFactory), new ServiceCharacteristics(ServiceLifetime.Scoped) },
            { typeof(IEntityGraphAttacher), new ServiceCharacteristics(ServiceLifetime.Scoped) },
            { typeof(IKeyPropagator), new ServiceCharacteristics(ServiceLifetime.Scoped) },
            { typeof(INavigationFixer), new ServiceCharacteristics(ServiceLifetime.Scoped) },
            { typeof(ILocalViewListener), new ServiceCharacteristics(ServiceLifetime.Scoped) },
            { typeof(IStateManager), new ServiceCharacteristics(ServiceLifetime.Scoped) },
            { typeof(IConcurrencyDetector), new ServiceCharacteristics(ServiceLifetime.Scoped) },
            { typeof(IInternalEntityEntryNotifier), new ServiceCharacteristics(ServiceLifetime.Scoped) },
            { typeof(IValueGenerationManager), new ServiceCharacteristics(ServiceLifetime.Scoped) },
            { typeof(IChangeTrackerFactory), new Service