C# 依赖注入运行时(动态)注册 [英] C# Dependency Injection Runtime (dynamic) registration

问题描述

我使用的是 VS 2017 和 .NET Core.使用依赖注入，我想在运行时动态注册我的服务.我的目标是编写我的服务实例，在单独的程序集中实现服务接口.然后将服务名称/程序集名称添加到某种配置文件(或数据库表)中.

I am using VS 2017 and .NET Core. Using Dependency Injection, I would like to register my service at runtime, dynamically. My goal is to write instances of my service that implement the service interface inside of separate assemblies. The servicename/assembly name will then be added to some sort of configuration file (or db table).

我的注册码会做这样的事情:

My registration code would do something like this:

var ServiceTypeName = LoadServiceAssembly(AssemblyName); 

var serviceProvider = new ServiceCollection()
 .AddTransient<IDILogger, "ConsoleDILogger">()  // <--- Goal
 .BuildServiceProvider();

var logger = serviceProvider.GetService(IDILogger);

显然，AddTransient 行将不起作用，因为这种方法不存在.然而，它确实描绘了这个想法.我想通过字符串名称注册类型，以便每次添加新服务类型时不需要重新编译加载器应用程序.

Clearly, the AddTransient line will not work as such a method does not exist. It does, however, depict the idea. I want to register the type by a string name so that the loader application need not be recompiled everytime I add a new service type.

我似乎无法找到如何做到这一点.欢迎大家提出意见.

I cannot seem to find how to do this. Any suggestions would be welcome.

TIA

推荐答案

您可以从设置中读取配置的类型，通过反射加载所需的类型并将其注册到服务集合中:

You could read configured type from the settings, load the required type via reflection and register it in service collection:

//  Read from config
var assemblyPath = "...";
var typeName = "...";

var assembly = Assembly.LoadFrom(assemblyPath);
var loggerType = assembly.GetType(typeName);

var serviceProvider = new ServiceCollection()
    .AddTransient(typeof(IDILogger), loggerType)
    .BuildServiceProvider();

var logger = serviceProvider.GetService<IDILogger>();

如果您添加或重新配置新的记录器，这种动态方法将不需要任何重新编译.

Such dynamic approach will not require any recompilation if you add or reconfigure new logger.

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