[英]How Autofac helps You to inject multiple instances of a class/interface in an existing class at the same time
[英]Can we inject multiple instances of the same class with different variables?
我們可以注入具有不同變量的相同 class 的多個實例嗎?
services.TryAddScoped<ISomeClass>(sp =>
{
return new SomeClass(1);
});
services.TryAddScoped<ISomeClass>(sp =>
{
return new SomeClass(2);
});
並且以某種方式將所需的拉到單獨的控制器中。
使用.TryAddScoped
您只有一個類型實例,如果您使用.AddScoped
您可以添加多個實例並在 controller 中接收一個 IEnumerable。
如果您需要命名實例,我已經創建了我的自定義解決方案:
public class NamedService<T>
{
public string Name { get; set; }
public T Service { get; set; }
public NamedService(string name, T service)
{
Name = name;
Service = service;
}
}
擴展方法:
public static T GetService<T>(this IServiceProvider serviceProvider, string name = null) where T : class
{
if (name != null)
{
var list = serviceProvider.GetServices<NamedService<T>>();
return list.FirstOrDefault(n => n.Name == name)?.Service;
}
return serviceProvider.GetService<T>();
}
public static IServiceCollection AddScoped<T>(this IServiceCollection services, string name, Func<IServiceProvider, T> factory)
{
return services.AddScoped(sp => new NamedService<T>(name, factory(sp)));
}
用法:
Services.AddScoped("some1", s => new SomeClass(1));
Services.AddScoped("some2", s => new SomeClass(2));
Controller:
public SomeController(IServiceProvider serviceProvider)
{
var someInstance = serviceProvider.GetService<ISomeClass>("some1");
}
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