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

问题描述

我正在使用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。我的目标是编写服务实例，以在单独的程序集中实现服务接口。然后，服务名称/程序集名称将添加到某种配置文件（或db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).

我的注册代码将执行以下操作：

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);

很显然，AddTransient行将不起作用，因为这种方法不存在。但是，它确实描述了这个想法。我想通过字符串名称注册该类型，以便不需要在每次添加新服务类型时都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.

我似乎找不到解决方法。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>();

如果添加或重新配置新的记录器，则这种动态方法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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