/// <summary>
/// Gets a service.
/// </summary>
/// <param name="serviceType">The type of the service to be found.</param>
/// <param name="ensureExists">If true, will throw an exception if the service is not found.</param>
/// <returns>The service instance, if present; null if not (and ensureExists is false).</returns>
/// <exception cref="ServiceMissingException">Thrown if ensureExists is true and the service is not found.</exception>
public object Get(Type serviceType, bool ensureExists)
{
Guard.ArgumentNotNull(serviceType, "serviceType");
if (Contains(serviceType, SearchMode.Local))
{
object result = locator.Get(new DependencyResolutionLocatorKey(serviceType, null));
DemandAddPlaceholder placeholder = result as DemandAddPlaceholder;
if (placeholder != null)
{
Remove(serviceType);
result = Build(placeholder.TypeToCreate, serviceType, null);
}
return(result);
}
if (parent != null)
{
return(parent.Get(serviceType, ensureExists));
}
if (ensureExists)
{
throw new ServiceMissingException(serviceType);
}
return(null);
}
/// <summary>
/// Adds a service that will not be created until the first time it is requested.
/// </summary>
/// <param name="serviceType">The type of service</param>
/// <param name="registerAs">The type to register the service as</param>
public void AddOnDemand(Type serviceType, Type registerAs)
{
Guard.ArgumentNotNull(serviceType, "serviceType");
if (registerAs == null)
{
registerAs = serviceType;
}
DependencyResolutionLocatorKey key = new DependencyResolutionLocatorKey(registerAs, null);
if (locator.Contains(key, SearchMode.Local))
{
throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, Properties.Resources.DuplicateService, registerAs.FullName));
}
DemandAddPlaceholder placeholder = new DemandAddPlaceholder(serviceType);
locator.Add(key, placeholder);
container.Add(placeholder);
}
