具有简单注入器的旧版.NET应用程序中的选项模式,配置

时间:2018-11-07 23:18:07

标签: configuration simple-injector configurationmanager legacy-code .net-core-configuration

本文https://medium.com/@dmitryzaets/legacy-net-applications-configuration-management-net-framework-4-5-1-68220335d9d8介绍了如何将选项模式与Autofac一起使用。我尝试将其翻译为与Simple Injector一起使用。但是我没有运气。 这是我的IOC代码

public class IocBootstrap2
{
    private Container Container { get; }
    public IocBootstrap2()
    {
        Container = new Container();
        var configurationBuilder = new ConfigurationBuilder()
            .SetBasePath(Path.Combine(System.AppDomain.CurrentDomain.BaseDirectory, "Configuration"))
            .AddJsonFile("settings.json", optional: false, reloadOnChange: true);
        var configuration = configurationBuilder.Build();
        //Register Options
        Container.Register(typeof(IOptions<>), typeof(OptionsManager<>));
        Container.Register(typeof(IOptionsMonitor<>), typeof(OptionsMonitor<>));
        Container.Register(typeof(IOptionsFactory<>), typeof(OptionsFactory<>));
        Container.Register(typeof(IOptionsMonitorCache<>), typeof(OptionsCache<>));
        // Register ConfigurationOptions
        Container.RegisterConfigurationOptions2<MailingOptions>(configuration.GetSection("mailing"));

    #if DEBUG
        Container.Verify();
    #endif   
 }
}

public static class ConfigurationSetupExtensions2
{
    public static void RegisterConfigurationOptions2<TOptions>(this Container container, IConfiguration config)
        where TOptions : class
    {
        container.Register(typeof(IOptionsChangeTokenSource<TOptions>),
            () => new ConfigurationChangeTokenSource<TOptions>(config), Lifestyle.Transient);
        container.Register(typeof(IConfigureOptions<TOptions>),
            () => new ConfigureFromConfigurationOptions<TOptions>(config), Lifestyle.Transient);
    }
}
 public class MailingOptions
{
    public MailingOptions()
    {
        BatchSize = 1;
    }
    public int BatchSize { get; set; }
    public int BatchDelay { get; set; }
}

settings.json

{
  "mailing": {
    "batchSize": 15, 
    "batchDelay": 1
  }
}

然后将其注入到这样的ViewModel:s构造函数中

  public class BlockViewModel 
    {
        private readonly MailingOptions _options;

        #region Constructor
        public BlockViewModel(IOptions<MailingOptions> options) 
        {
            _options = options.Value;
        }
        #endregion

    }

当我运行它时,我在Container.Verify中得到了异常。

  

OptionsFactory 类型的构造函数包含名称为“ setups”且类型为IEnumerable >的参数,该参数未注册。请确保已注册IEnumerable >,或更改OptionsFactory 的构造函数。但是,有一个IConfigureOptions 的注册。您是否要依靠IConfigureOptions

StackTrace:

在SimpleInjector.Container.ThrowParameterTypeMustBeRegistered(InjectionTargetInfo目标)

我如何注册IEnumerable<IConfigureOptions<MailingOptions>>? 有人可以告诉我我在做错什么,或更准确地说,是我不了解的是什么?

1 个答案:

答案 0 :(得分:3)

简短的答案是:不要将IOptions<T>注入您的应用程序组件。如here所述,这只会使您的组件,它们的单元测试以及您的配置(如您已经注意到的)复杂化。

相反,让BlockViewModel直接依赖MailingOptions

public class BlockViewModel 
{
    private readonly MailingOptions _options;

    public BlockViewModel(MailingOptions options) 
    {
        _options = options ?? throw new ArgumentNullException(nameof(options));
    }
}

这使您可以将配置简化为以下内容:

Container = new Container();
var configutation = new ConfigurationBuilder()
  .SetBasePath(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Configuration"))
    .AddJsonFile("settings.json", optional: false);
    .Build();

MailingOptions options = configuration.GetSection("mailing").Get<MailingOptions>();
Container.RegisterInstance<MailingOptions>(options);

// Register View Models
Container.Register<BlockViewModel>();

Container.Verify();