Question

我正在使用Autofac和点网核心构建控制台应用程序。

我要注册的服务之一是我构建的API服务。它的构造函数采用一些参数，这些参数是存储在配置文件中的值，我可以通过100 / \ 20 500 / \ 10 30（在程序启动时注册）进行访问。

如何注册服务，使构造函数具有ConfigurationBuilder中可用的参数？

例如，我的服务的构造函数是：

IConfigurationRoot

我正在如下public DearInventoryApiService(ILogger<DearInventoryApiService> logger, string baseUrl, string accountId, string applicationKey)中注册容器：

Program.cs

我的private static void RegisterServices() { var collection = new ServiceCollection(); collection.AddLogging(configure => configure.AddConsole()); //register the autofac container provider var containerBuilder = new ContainerBuilder(); //register the default module containerBuilder.RegisterModule(new DefaultDependencyModule()); containerBuilder.Populate(collection); var container = containerBuilder.Build(); ServiceProvider = new AutofacServiceProvider(container); }如下所示：

DefaultDependencyModule

我的上述问题是我不确定如何将配置值获取到模块中进行注册？

编辑1：

我已经更改了模块以传递配置。它可以工作，但是我不确定这是不好的设计还是有更好的东西？

public class DefaultDependencyModule : Module
{
    protected override void Load(ContainerBuilder builder)
    {
        builder.Register(r => new DearInventoryApiService(r.Resolve<ILogger<DearInventoryApiService>>(), {base url here}, {account id here}, {application key here})).As<IDearInventoryService>();

    }
}

Answer 1

选项1

您的编辑看起来不错，但是根据Single Responsibility Principle，我认为最好在ApplicationConfiguration访问和DefaultDependencyModule之间脱钩。

public class DefaultDependencyModule : Module
{
    public string BaseUrl { get; set; }
    public string AccountId { get; set; }
    public string ApplicationKey { get; set; }

    protected override void Load(ContainerBuilder builder)
    {
        //dear inventory api service
        builder.Register(r =>
        {
            var logger = r.Resolve<ILogger<DearInventoryApiService>>();

            return new DearInventoryApiService(logger, BaseUrl, AccountId, ApplicationKey);
        }).As<IDearInventoryService>();   
    }
}

并使用以下命令修改RegisterServices：

private static void RegisterServices()
{
    string baseUrl = ApplicationConfiguration["dearInventory:apiBaseUrl"];
    string accountId = ApplicationConfiguration["dearInventory:apiAccountId"];
    string applicationKey = ApplicationConfiguration["dearInventory:apiApplicationKey"];

    //register the default module
    containerBuilder.RegisterModule(new DefaultDependencyModule() {
        BaseUrl = baseUrl,
        AccountId = accountId,
        ApplicationKey = applicationKey
    });

    //code
});

选项2：

public class DefaultDependencyModule : Module
{
    protected override void Load(ContainerBuilder builder)
    {
        //dear inventory api service
        builder.Register((c, p) =>
        {
            string baseUrl = p.Named<string>("baseUrl");
            string accountId = p.Named<string>("accountId");
            string baseUrl = p.Named<string>("baseUrl");
            var logger = r.Resolve<ILogger<DearInventoryApiService>>();

            return new DearInventoryApiService(logger, baseUrl, accountId, applicationKey);
        })
        .As<IDearInventoryService>();   
    }
}

解决时间：

string baseUrl = ApplicationConfiguration["dearInventory:apiBaseUrl"];
string accountId = ApplicationConfiguration["dearInventory:apiAccountId"];
string applicationKey = ApplicationConfiguration["dearInventory:apiApplicationKey"];

DearInventoryService service = c.Resolve<DearInventoryService>(
    new NamedParameter("baseUrl", baseUrl), 
    new NamedParameter("accountId", accountId), 
    new NamedParameter("applicationKey", applicationKey)
);

如何在Autoac模块中注册依赖于外部文件中配置值的服务

1 个答案:

选项1

选项2：