我有以下界面:
public interface IConfigurationProvider<TSettings> where TSettings : ISettings, new()
{
TSettings Settings { get; }
}
public interface ISettings
{
}
我有以下IConfigurationProvider实现:
public class ConfigurationProvider<TSettings> : IConfigurationProvider<TSettings> where
TSettings : ISettings, new()
{
public ConfigurationProvider()
{
this.BuildConfiguration();
}
public TSettings Settings { get; private set; }
private void BuildConfiguration()
{
this.Settings = new TSettings();
//...load and assign properties to 'this.Settings'
//...skipped
// now 'Settings' property contains configured 'ISettings' instance
}
}
我还可以使用不同的类来实现“ISettings”界面。例如,
public class UserSettings : ISettings
{
public int SomeProperty1 { get; set; }
public int SomeProperty2 { get; set; }
}
public class CatalogSettings : ISettings
{
public int SomeProperty3 { get; set; }
public int SomeProperty4 { get; set; }
}
我正在使用以下代码配置'ContainerBuilder':builder.RegisterGeneric(typeof(ConfigurationProvider<>)).As(typeof(IConfigurationProvider<>));
工作正常。为了获得'UserSettings',我使用以下代码:
var userSettingsProvider = builder.Resolve<IConfigurationProvider<UserSettings>>();
var userSettings = userSettingsProvider.Settings;
问题:如何配置'ContainerBuilder'以便我可以通过以下方式解决某些'ISettings':
var userSettings = builder.Resolve<UserSettings>();
是否可以使用Autofac?
提前致谢
答案 0 :(得分:6)
您可以使用IRegistrationSource
执行此操作 - 请参阅http://nblumhardt.com/2010/01/declarative-context-adapters-autofac2/以获取概述。
基本结构如下:
class SettingsSource : IRegistrationSource {
static readonly MethodInfo BuildMethod = typeof(SettingsSource).GetMethod(
"BuildRegistration",
BindingFlags.Static | BindingFlags.NonPublic);
public IEnumerable<IComponentRegistration> RegistrationsFor(
Service service,
Func<Service, IEnumerable<IComponentRegistration>> registrations) {
var ts= service as TypedService;
if (ts != null && typeof(ISettings).IsAssignableFrom(ts.ServiceType) {
var buildMethod = BuildMethod.MakeGenericMethod(ts.ServiceType);
yield return (IComponentRegistration) buildMethod.Invoke(null, null);
}
}
static IComponentRegistration BuildRegistration<TSettings>()
where TSettings : ISettings {
return RegistrationBuilder
.ForDelegate((c, p) =>
c.Resolve<IConfigurationProvider<TSettings>>().Settings)
.CreateRegistration();
}
public bool IsAdapterForIndividualComponents { get { return false; } }
}
这是如此注册:
builder.RegisterGeneric(typeof(ConfigurationProvider<>))
.As(typeof(IConfigurationProvider<>));
builder.RegisterSource(new SettingsSource());
(未编译或测试过,所以如果它失效请告诉我;))