private void EnsureProvideFunctionPresent(CachedServiceConfiguration serviceRecord)
{
if (serviceRecord.ProvideFunction == null)
{
throw new DependencyResolutionException(
$"Cannot provide service instance because provider function is null",
serviceRecord.ProvideType,
ServiceRegistry);
}
}
private object ProvideByInstance(CachedServiceConfiguration serviceRecord)
{
if (serviceRecord.Instance == null)
{
serviceRecord.Instance = serviceRecord.ProvideFunction.Invoke(this);
}
switch (serviceRecord.Lifetime)
{
case Lifetime.Transient:
EnsureProvideFunctionPresent(serviceRecord);
return(serviceRecord.ProvideFunction.Invoke(this));
case Lifetime.Singleton:
return(serviceRecord.Instance);
default:
return(serviceRecord.Instance);
}
}
private object ProvideByType(CachedServiceConfiguration serviceRecord)
{
var dependencies = serviceRecord.ProvideType.GetConstructors().FirstOrDefault().GetParameters();
var dependencyInstances = new List <object>();
foreach (var dependency in dependencies)
{
dependencyInstances.Add(Resolve(dependency.ParameterType));
}
var instance = Activator.CreateInstance(serviceRecord.ProvideType, dependencyInstances.ToArray());
if (serviceRecord.Lifetime == Lifetime.Singleton)
{
serviceRecord.Provisioning = Provisioning.ByInstance;
serviceRecord.Instance = instance;
}
return(instance);
}
