public static List <ServiceRegistrationResult> TryRegisterService(this IServiceCollection services, Type type, ServiceBuilderDelegate instantiate = null)
{
List <ServiceRegistrationResult> result = null;
if (!type.IsClass || type.IsAbstract)
{
return(result);
}
var serviceAttributes = type.GetCustomAttributes(typeof(ServiceAttribute), false)
.OfType <ServiceAttribute>().ToList();
foreach (var serviceAttribute in serviceAttributes)
{
if (result == null)
{
result = new List <ServiceRegistrationResult>();
}
result.Add(ServiceRegistration.Register(services, serviceAttribute, type, instantiate));
}
return(result);
}
public static ServiceRegistrationResult Register(IServiceCollection services, ServiceAttribute attribute, Type declaredType, ServiceBuilderDelegate instantiate = null)
{
if (declaredType == null)
{
throw new NotSupportedException();
}
var serviceType = attribute.ServiceType;
if (serviceType == null)
{
serviceType = declaredType;
}
if (declaredType.ContainsGenericParameters && serviceType.ContainsGenericParameters)
{
// Open generic type
if (instantiate != null)
{
throw new NotSupportedException("Cannot provide delegate for instantiation for open generic types.");
}
}
else
{
if (declaredType.ContainsGenericParameters && !serviceType.ContainsGenericParameters)
{
// We are registering services on a generic type implementation
declaredType = declaredType.MakeGenericType(serviceType.GetGenericArguments());
}
}
services.Add(instantiate != null
? new ServiceDescriptor(serviceType, provider => instantiate(provider, serviceType, declaredType),
attribute.Lifetime)
: new ServiceDescriptor(serviceType, declaredType, attribute.Lifetime));
return(new ServiceRegistrationResult(serviceType, declaredType, attribute.Lifetime));
}
public static void Register(IServiceCollection services, ServiceAttribute attribute, Type declaredType, ServiceBuilderDelegate instantiate = null)
{
if (instantiate == null)
{
instantiate = (provider, service, implementation) =>
ActivatorUtilities.CreateInstance(provider, implementation);
}
if (declaredType == null)
{
// Not supported (yet)
throw new NotImplementedException();
}
var serviceType = attribute.ServiceType;
if (serviceType == null)
{
serviceType = declaredType;
}
if (declaredType.IsGenericType)
{
// We are registering services on a generic type implementation
declaredType = declaredType.MakeGenericType(serviceType.GetGenericArguments());
}
switch (attribute.Lifetime)
{
case ServiceLifetime.Scoped:
services.AddScoped(serviceType, provider => instantiate(provider, serviceType, declaredType));
break;
case ServiceLifetime.Singleton:
services.AddSingleton(serviceType, provider => instantiate(provider, serviceType, declaredType));
break;
case ServiceLifetime.Transient:
services.AddTransient(serviceType, provider => instantiate(provider, serviceType, declaredType));
break;
}
}
