问题描述
我有一个名为 IRule 的接口和多个实现该接口的类.我想使用.NET Core依赖注入容器来加载IRule的所有实现,所以所有实现的规则.
I have a interface called IRule and multiple classes that implement this interface. I want to uses the .NET Core dependency injection Container to load all implementation of IRule, so all implemented rules.
不幸的是,我无法完成这项工作.我知道我可以将 IEnumerable
注入控制器的 ctor,但我不知道如何在 Startup.cs 中注册此设置
Unfortunately I can't make this work. I know I can inject an IEnumerable<IRule>
into my ctor of the controller, but I don't know how to register this setup in the Startup.cs
推荐答案
只需将所有IRule
实现一一注册即可;Microsoft.Extensions.DependencyInjection (MS.DI) 库可以将其解析为 IEnumerable
.例如:
It's just a matter of registering all IRule
implementations one by one; the Microsoft.Extensions.DependencyInjection (MS.DI) library can resolve it as an IEnumerable<T>
. For instance:
services.AddTransient<IRule, Rule1>();
services.AddTransient<IRule, Rule2>();
services.AddTransient<IRule, Rule3>();
services.AddTransient<IRule, Rule4>();
消费者:
public sealed class Consumer
{
private readonly IEnumerable<IRule> rules;
public Consumer(IEnumerable<IRule> rules)
{
this.rules = rules;
}
}
注意:MS.DI 支持的唯一集合类型是 IEnumerable
.
NOTE: The only collection type that MS.DI supports is IEnumerable<T>
.
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