如何在 StructureMap Registy 构造函数中获取实例？

Question

如何在 StructureMap Registy 构造函数中获取某种类型的实例（在不同的注册表中注册）？我想用这样的代码：

    public RepositoriesRegistry()
    {
        IApplicationSettings lApplicationSettings =
            ObjectFactory.GetInstance<IApplicationSettings>();
        Debug.Assert(lApplicationSettings != null);

        const string cSupportedDevicesConnectionString =
            "metadata=res://*/Models.SupportedDevices.Database.SupportedDevicesModel.csdl|res://*/Models.SupportedDevices.Database.SupportedDevicesModel.ssdl|res://*/Models.SupportedDevices.Database.SupportedDevicesModel.msl;provider=System.Data.SqlClient;provider connection string=\"{0}\"";
        string lSupportedDevicesConnectionString =
            string.Format(cSupportedDevicesConnectionString, lDatabaseConnectionString);
        SupportedDevicesEntities lSupportedDevicesEntities =
            new SupportedDevicesEntities(lSupportedDevicesConnectionString);
        ForRequestedType<SupportedDevicesEntities>().TheDefault.IsThis(
            lSupportedDevicesEntities);
        ForRequestedType<ISupportedDevicesRepository>().TheDefault.IsThis(
            new SupportedDevicesRepository(lSupportedDevicesEntities));

    }

IApplicationSettings 是应用程序设置的接口。实现此接口的具体类型（当前为 ConfigFileApplicationSettings 类）在另一个注册表中注册，如下所示：

    public ApplicationServicesRegistry()
    {
        ForRequestedType<IApplicationSettings>().TheDefault.IsThis(
            new ConfigFileApplicationSettings());
    }

并且两个注册表都在 Bootstrapper 中注册：

        #region IBootstrapper Members

    public void BootstrapStructureMap()
    {
        ObjectFactory.Initialize(InitalizeStructureMapContainer);
    }

    #endregion

    #region Private properties

    private static bool HasStarted { get; set; }

    #endregion

    #region Private methods

    private void InitalizeStructureMapContainer(IInitializationExpression x)
    {
        x.IgnoreStructureMapConfig = true;
        x.AddRegistry<ViewModelRegistry>();
        x.AddRegistry<ApplicationServicesRegistry>();
        x.AddRegistry<RepositoriesRegistry>();
        x.AddRegistry<DataOperationsRegistry>();
    }

    #endregion

当我尝试在注册表构造函数中获取 IApplicationRegisty 的实例时，我遇到了错误（当然）。我不完全了解如何以正确的方式使用 StructureMap。也许我应该以不同的方式做这件事。但无论如何，我能否在 Registry 构造函数中提前注册某种类型的实例？

Answer 1

我今天遇到了同样的问题。 Jeremy Miller（没有关系:)）的答案是 StructureMap 未设置为在配置时创建实例。

他推荐和我使用的解决方法是为设置创建一个容器。这是我的解决方案。

public class SettingsRegistry : Registry
{
    public SettingsRegistry()
    {
        ForRequestedType<ISettingsProvider>().TheDefault.Is.OfConcreteType<AppSettingsProvider>();

        Scan(s =>
        {
            s.TheCallingAssembly();
            s.With<SettingsScanner>();
        });
    }
}

public class RegistryNeedingSettings : Registry
{
    public RegistryNeedingSettings()
    {
        var settingsContainer = new Container(new SettingsRegistry());
        var coreSettings = settingsContainer.GetInstance<CoreSettings>();

        //configuration needing access to the settings.
    }
}

我将所有设置都移到了它自己的注册表中，并确保在依赖注册表之前配置了设置注册表。

希望这会有所帮助。