autofac

浅谈IOC

混江龙づ霸主 提交于 2020-08-04 11:39:24
一、引言 IOC-Invertion of Control,即控制反转,是一种程序设计思想,世上本没有路,走的人多了便有了路,本文将一步步带你了解IOC设计思想的演进之路。 在学习IOC之前我们先初步了解几个概念 依赖(Dependency) :就是有联系,表示一个类依赖于另一个类 依赖倒置原则(DIP) :设计模式六大原则之一,是一种软件架构设计原则 控制反转(IOC) :一种软件设计原则,上层对下层的依赖(即底层模块的获得)交给第三方 依赖注入(DI) :实现IOC的一种方式、手段 IOC容器 :依赖注入的框架,用来映射依赖,管理对象创建和生存周期 二、依赖 依赖就是有联系,有地方使用它就是有依赖它,下面看一个简单的示例 class BMW { public string Show() { return " 宝马 " ; } } class ChinesePeople { private BMW bmw = new BMW(); public void Run() { Console.WriteLine($ " 今天开{bmw.Show()}上班 " ); } } class Program { static void Main( string [] args) { ChinesePeople people = new ChinesePeople(); BMW bmw =

Dependency Injection on AuthorizationOptions Requirement in DotNet Core

删除回忆录丶 提交于 2020-08-01 03:57:09
问题 I have a .NET core project and am trying to create a custom policy using AuthorizationOptions as shown in the documentation located here: ASP.NET.Core Authorization - Dependency Injection in requirement handlers The examples show setting up an authorization requirement with 1 parameter - a simple int value. My custom requirement requires a string parameter as well as a DbContext object. I want to inject the DbContext into the requirement's constructor at runtime. I am using the Autofac

.NET CORE 依赖注入 实践总结

霸气de小男生 提交于 2020-07-28 04:29:42
原文: .NET CORE 依赖注入 实践总结 知识点回顾 依赖包。 Microsoft.Extensions.DependencyInjection.Abstractions 核心对象和方法。 IServiceCollection 。注入对象的容器。注意它只存储对象的元数据,并不保存实例对象。 IServiceProvider 。注入对象的提供者。它负责提供具体的对象实例。在架构中,IServiceProvider有2种身份,一种是Root ServiceProvider,由service.BuildServiceProvider()创建,生命周期贯穿整个应用程序,AddSingleton对象保存在这里。另外一种则是普通IServiceProvider,由IServiceScope创建,生命周期即为AddScoped的生命周期。AddScope 的对象保存在这里。普通ServiceProvider由Root ServiceProvider创建的IServiceScope创建。 IServiceScope 。表某一个生命周期范围。由ServiceProvider.CreateScope()创建。 注入方式,知识点一 。 注入功能默认在Startup类中的ConfigureServices方法中。 注入方式,知识点二 。支持以下三种方式 AddScoped。生命周期为Scoped类型

Java Spring Boot VS .NetCore (三)Ioc容器处理

心不动则不痛 提交于 2020-07-26 23:31:16
Java中Spring Ioc 的处理还是通过配置文件的方式来实现,容器的初始需要说到上下文对象 ApplicationContext这个类,通过ClassPathXmlApplicationContext 加载 Ioc容器Xml配置并通过该实例对象的GetBean来获取对象实例 下面我就这一块对比 Java 与 .NetCore的使用方式 容器处理 Java: 首先需要建立Spring Ioc的xml配置文件,配置Bean, 也可以通过 @Component 注解的方式实现 <?xml version= " 1.0 " encoding= " UTF-8 " ?> <beans xmlns= " http://www.springframework.org/schema/beans " xmlns:xsi = " http://www.w3.org/2001/XMLSchema-instance " xsi:schemaLocation = " http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd " > <bean id= " testUserServices " class = " com.example.demo

dotNET Core 3.X 使用 Autofac 来增强依赖注入

回眸只為那壹抹淺笑 提交于 2020-07-25 06:23:59
在上一篇《 dotNET Core 3.X 依赖注入 》中简单介绍了 dotNET Core 框架本身的依赖注入功能,大部分情况下使用框架的依赖注入功能就可以满足了,在一些特殊场景下,我们就需要引入第三方的注入框架。 为什么要使用 Autofac? 如果您在之前的 dotNET Framwork 时代使用过依赖注入,那么对 Autofac 一定不会陌生,在 dotNET Core 中也可以很方便的使用 Autofac,之所以使用第三方注入框架,是因为能提供更多的功能: 属性注入 批量注入 动态代理的 AOP 功能 在 dotNET Core 中使用 Autofac 在 dotNET Core 2.x 和 3.x 中使用 Autofac 是有区别的,所以下面分别介绍在两个版本中的简单使用。 2.x 1、创建 dotNET Core 2.1 版本的 WebAPI 项目; 2、创建 IUserService 接口和 UserService 类 public interface IUserService { string GetUserName(); } public class UserService: IUserService { public string GetUserName() { return "oec2003"; } } 3、创建 UserController

AutoFac / .NET Core - Register DBcontext

a 夏天 提交于 2020-07-18 03:18:06
问题 I have a new .NET Core Web API project that has the following projects structure: API -> Business / Domain -> Infrastructure The API is very thin with only the API methods. The Business / Domain layer has all my business logic. And finally, my Infrastructure layer has my DB classes using EF Core 2.0. I know using .NET Core built-in Dependency Injection I can add a reference from the API project to the Infrastructure project, then add the following code in the StartUp.cs file: services

AutoFac / .NET Core - Register DBcontext

别等时光非礼了梦想. 提交于 2020-07-18 03:16:16
问题 I have a new .NET Core Web API project that has the following projects structure: API -> Business / Domain -> Infrastructure The API is very thin with only the API methods. The Business / Domain layer has all my business logic. And finally, my Infrastructure layer has my DB classes using EF Core 2.0. I know using .NET Core built-in Dependency Injection I can add a reference from the API project to the Infrastructure project, then add the following code in the StartUp.cs file: services

AutoFac / .NET Core - Register DBcontext

时光总嘲笑我的痴心妄想 提交于 2020-07-18 03:16:13
问题 I have a new .NET Core Web API project that has the following projects structure: API -> Business / Domain -> Infrastructure The API is very thin with only the API methods. The Business / Domain layer has all my business logic. And finally, my Infrastructure layer has my DB classes using EF Core 2.0. I know using .NET Core built-in Dependency Injection I can add a reference from the API project to the Infrastructure project, then add the following code in the StartUp.cs file: services

How Does Autofac Handle Non-Disposable Components

核能气质少年 提交于 2020-06-29 04:32:08
问题 I have read that Autofac does a good job of disposing IDisposable resources, but I'm having trouble finding any info on what it does with components that do not have any unmanaged resources, and therefore do not need to implement IDisposable . I would assume these all get garbage collected, but is there any documentation on this scenario? EDIT Asking more specifically, are all Autofac-resolved components required to implement IDisposable ? The docs state that To take advantage of automatic

Autofac assembly scanning - .NET Core

跟風遠走 提交于 2020-06-28 09:23:13
问题 I've been trying to get assembly scanning working in my .NET core 2.0 project. The exception I am getting Autofac.Core.Registration.ComponentNotRegisteredException HResult=0x80131500 Message=The requested service 'Microsoft.AspNetCore.Hosting.Internal.WebHostOptions' has not been registered. To avoid this exception, either register a component to provide the service, check for service registration using IsRegistered(), or use the ResolveOptional() method to resolve an optional dependency.