public IEnumerable<SelectedProperty> SelectProperties(IBuilderContext context, IPolicyList resolverPolicyDestination)
{
var target = context.BuildKey.Type;
var typeTracker = context.Policies.Get<TypeTrackerPolicy>(context.BuildKey).TypeTracker;
// Unity includes a policy used when explicitly configuring injection. Here we borrow
// it to specify the properties we want to fill. Normally the user specifies specific
// properties and the policies for filling them, here we do it automatically.
var policy = new SpecifiedPropertiesSelectorPolicy();
foreach (var property in target.GetProperties())
{
// Ignore indexed properties
if(property.GetIndexParameters().Length > 0)
continue;
// Ignore read only properties
if(!property.CanWrite)
continue;
// Ignore properties we can't fill anyway
if(!typeTracker.HasDependency(property.PropertyType))
continue;
// Ignore properties that would create obvious circular dependencies. It is still
// possible to create one if you have multiple classes referring to each other though.
if (property.PropertyType == property.DeclaringType ||
property.DeclaringType.IsAssignableFrom(property.PropertyType))
continue;
policy.AddPropertyAndValue(property, new TypeToBeResolved(
property.PropertyType,
GetResolver(property)));
}
return policy.SelectProperties(context, resolverPolicyDestination);
}
private static SpecifiedPropertiesSelectorPolicy GetSelectorPolicy(IPolicyList policies, Type typeToInject, string name)
{
NamedTypeBuildKey key = new NamedTypeBuildKey(typeToInject, name);
IPropertySelectorPolicy selector =
policies.GetNoDefault<IPropertySelectorPolicy>(key, false);
if (selector == null || !(selector is SpecifiedPropertiesSelectorPolicy))
{
selector = new SpecifiedPropertiesSelectorPolicy();
policies.Set<IPropertySelectorPolicy>(selector, key);
}
return (SpecifiedPropertiesSelectorPolicy)selector;
}