/// <summary>
/// Expose the registered service to MEF parts as an export.
/// </summary>
/// <param name="registration">The component being registered.</param>
/// <param name="configurationAction">Action on an object that configures the export.</param>
/// <returns>A registration allowing registration to continue.</returns>
public static IRegistrationBuilder <TLimit, TActivatorData, TSingleRegistrationStyle> Exported <TLimit, TActivatorData, TSingleRegistrationStyle>(this IRegistrationBuilder <TLimit, TActivatorData, TSingleRegistrationStyle> registration, Action <ExportConfigurationBuilder> configurationAction)
where TSingleRegistrationStyle : SingleRegistrationStyle
{
if (registration == null)
{
throw new ArgumentNullException(nameof(registration));
}
if (configurationAction == null)
{
throw new ArgumentNullException(nameof(configurationAction));
}
var configuration = new ExportConfigurationBuilder();
configurationAction(configuration);
registration.OnRegistered(e => AttachExport(e.ComponentRegistryBuilder, e.ComponentRegistration, configuration));
return(registration);
}
private static void AttachExport(IComponentRegistryBuilder registry, IComponentRegistration registration, ExportConfigurationBuilder exportConfiguration)
{
var contractService = new ContractBasedService(exportConfiguration.ContractName, exportConfiguration.ExportTypeIdentity);
var rb = RegistrationBuilder.ForDelegate((c, p) =>
{
var ctx = c.Resolve <IComponentContext>();
return(new Export(
new ExportDefinition(exportConfiguration.ContractName, exportConfiguration.Metadata),
() => ctx.ResolveComponent(new ResolveRequest(contractService, registration, Array.Empty <Parameter>()))));
})
.As(contractService)
.ExternallyOwned()
.WithMetadata((IEnumerable <KeyValuePair <string, object> >)exportConfiguration.Metadata);
registry.Register(rb.CreateRegistration());
}
static void AttachExport(IComponentRegistry registry, IComponentRegistration registration, ExportConfigurationBuilder exportConfiguration)
{
var contractService = new ContractBasedService(exportConfiguration.ContractName, exportConfiguration.ExportTypeIdentity);
var rb = RegistrationBuilder.ForDelegate((c, p) =>
{
var ctx = c.Resolve <IComponentContext>();
return(new Export(
new ExportDefinition(exportConfiguration.ContractName, exportConfiguration.Metadata),
() => ctx.ResolveComponent(registration, new Parameter[0])));
})
.As(contractService)
.ExternallyOwned()
.WithMetadata(exportConfiguration.Metadata);
registry.Register(rb.CreateRegistration());
}
