/// <summary>
/// As with <see cref="ServiceConstructor.TryResolve"/>, but this method
/// allows you to pass your requested generic service type; and will
/// returns the service or default.
/// </summary>
/// <typeparam name="TService">The concrete type to resolve.</typeparam>
/// <param name="serviceConstructor">Not null.</param>
/// <param name="instanceProvider">Optional: can provide the instance now;
/// and is checked first.</param>
/// <returns>The resolved service, or default if the service can't be resolved.</returns>
/// <exception cref="ArgumentNullException"></exception>
public static TService ResolveOrDefault <TService>(
this ServiceConstructor serviceConstructor,
Func <Type, object> instanceProvider = null)
{
serviceConstructor.TryResolve(out TService service, instanceProvider);
return(service);
}
/// <summary>
/// As with <see cref="ServiceConstructor.TryInject"/>, but this method
/// allows you to pass your requested generic service type.
/// </summary>
/// <typeparam name="TAttribute">Specifies an Attribute type that must be
/// present on a method.</typeparam>
/// <param name="serviceConstructor">Not null.</param>
/// <param name="target">Is the target object to locate the method on.</param>
/// <param name="instanceProvider">Optional service instance provider that
/// will first be checked for method or constructor argument values.</param>
/// <returns>True for success.</returns>
/// <exception cref="ArgumentNullException"></exception>
public static bool TryInject <TAttribute>(
this ServiceConstructor serviceConstructor,
object target,
Func <Type, object> instanceProvider = null)
{
if (serviceConstructor == null)
{
throw new ArgumentNullException(nameof(serviceConstructor));
}
return(serviceConstructor.TryInject(target, typeof(TAttribute), instanceProvider));
}
/// <summary>
/// As with <see cref="ServiceConstructor.TryConstruct"/>, but this method
/// allows you to pass your requested generic service type.
/// </summary>
/// <typeparam name="TService">The concrete type to construct.</typeparam>
/// <param name="serviceConstructor">Not null.</param>
/// <param name="service">The newly-constructed service if the method returns true.</param>
/// <param name="instanceProvider">Optional: can provide constructor arguments
/// for the constructed instance now; and is checked first.</param>
/// <returns>False if the service cannot be constructed.</returns>
/// <exception cref="ArgumentNullException"></exception>
public static bool TryConstruct <TService>(
this ServiceConstructor serviceConstructor,
out TService service,
Func <Type, object> instanceProvider = null)
{
if (serviceConstructor == null)
{
throw new ArgumentNullException(nameof(serviceConstructor));
}
if (serviceConstructor.TryConstruct(
typeof(TService),
out object constructed,
instanceProvider) &&
constructed is TService tService)
{
service = tService;
return(true);
}
service = default;
return(false);
}