private static bool TryGetServiceAttribute(TypeInfo type, out ServiceAttribute serviceAttribute)
{
var customAttributeData =
type.CustomAttributes.SingleOrDefault(
e => ServiceAttributeType.IsAssignableFrom(e.AttributeType.GetTypeInfo()));
if (customAttributeData == null)
{
serviceAttribute = null;
return(false);
}
serviceAttribute = (ServiceAttribute)
ServiceAttributeType.DeclaredConstructors.Single().Invoke(
new[] { customAttributeData.ConstructorArguments[0].Value });
foreach (var namedArgument in customAttributeData.NamedArguments)
{
switch (namedArgument.MemberName)
{
case nameof(ServiceAttribute.Registration):
{
serviceAttribute.Registration = (RegistrationType)namedArgument.TypedValue.Value;
break;
}
case nameof(ServiceAttribute.TryAdd):
{
serviceAttribute.TryAdd = (bool)namedArgument.TypedValue.Value;
break;
}
case nameof(ServiceAttribute.TypesToRegister):
{
serviceAttribute.TypesToRegister = ((IEnumerable <CustomAttributeTypedArgument>)
namedArgument.TypedValue.Value).Select(e => (Type)e.Value).ToArray();
break;
}
default:
throw new InvalidOperationException(
$"The member '{namedArgument.MemberName}' has no assign code");
}
}
return(true);
}
private static bool TryGetServiceAttribute(Type type, out ServiceAttribute serviceAttribute)
{
serviceAttribute = type.GetCustomAttribute <ServiceAttribute>(true);
return(serviceAttribute != null);
}