void ISelector.Populate(IServiceCollection services)
{
if (services == null)
{
throw new ArgumentNullException(nameof(services));
}
foreach (var type in Types)
{
var typeInfo = type.GetTypeInfo();
var attributes = typeInfo.GetCustomAttributes <ServiceDescriptorAttribute>().ToArray();
// Check if the type has multiple attributes with same ServiceType.
var duplicates = attributes
.GroupBy(s => s.ServiceType)
.SelectMany(grp => grp.Skip(1));
if (duplicates.Any())
{
throw new InvalidOperationException($@"Type ""{type.FullName}"" has multiple ServiceDescriptor attributes with the same service type.");
}
foreach (var attribute in attributes)
{
var serviceTypes = GetServiceTypes(type, attribute);
foreach (var serviceType in serviceTypes)
{
var descriptor = new ServiceDescriptor(serviceType, type, attribute.Lifetime);
services.Add(descriptor);
if (serviceType.IsInterface)
{
var extensionDescriptor = (ServiceDescriptor)ServiceTypeMetadataExtensions
.GetMetadataServiceDescriptorMethodInfo
.MakeGenericMethod(descriptor.ServiceType)
.FastInvoke(null, new object[] { descriptor.ImplementationType, null });
services.Add(extensionDescriptor);
ServiceTypeMetadataExtensions.AddMetadata(descriptor.ImplementationType, attribute.Name);
}
}
}
}
}
public static IServiceCollection RegisterInstance <TService>(this IServiceCollection services, object instance, string name)
{
var serviceType = typeof(TService);
var descriptor = new ServiceDescriptor(typeof(TService), instance);
services.Add(descriptor);
var extensionDescriptor = (ServiceDescriptor)ServiceTypeMetadataExtensions
.GetMetadataServiceDescriptorMethodInfo
.MakeGenericMethod(descriptor.ServiceType)
.FastInvoke(null, new object[] { instance.GetType(), instance });
services.Add(extensionDescriptor);
int serviceKey = instance.GetHashCode();
ServiceTypeMetadataExtensions.AddMetadata(instance.GetType(), serviceKey, name);
return(services);
}