private Action <IServiceProvider, IComponent> CreateInitializer(Type type)
{
// Do all the reflection up front
var injectableProperties =
MemberAssignment.GetPropertiesIncludingInherited(type, _injectablePropertyBindingFlags)
.Where(p => p.IsDefined(typeof(InjectAttribute)));
var injectables = injectableProperties.Select(property =>
(
propertyName: property.Name,
propertyType: property.PropertyType,
setter: MemberAssignment.CreatePropertySetter(type, property, cascading: false)
)).ToArray();
return(Initialize);
// Return an action whose closure can write all the injected properties
// without any further reflection calls (just typecasts)
void Initialize(IServiceProvider serviceProvider, IComponent component)
{
foreach (var(propertyName, propertyType, setter) in injectables)
{
var serviceInstance = serviceProvider.GetService(propertyType);
if (serviceInstance == null)
{
throw new InvalidOperationException($"Cannot provide a value for property " +
$"'{propertyName}' on type '{type.FullName}'. There is no " +
$"registered service of type '{propertyType}'.");
}
setter.SetValue(component, serviceInstance);
}
}
}
private static IEnumerable <PropertyInfo> GetBindableProperties(Type targetType) => MemberAssignment.GetPropertiesIncludingInherited(targetType, _bindablePropertyFlags) .Where(property => property.IsDefined(typeof(ParameterAttribute)));
