/// <summary>
/// Selects the best constructor from the available constructors.
/// </summary>
/// <param name="constructorBindings">Available constructors.</param>
/// <returns>The best constructor.</returns>
/// <exception cref='DependencyResolutionException'>A single unambiguous match could not be chosen.</exception>
public ConstructorParameterBinding SelectConstructorBinding(ConstructorParameterBinding[] constructorBindings)
{
if (constructorBindings == null) throw new ArgumentNullException("constructorBindings");
if (constructorBindings.Length == 0) throw new ArgumentOutOfRangeException("constructorBindings");
if (constructorBindings.Length == 1)
return constructorBindings[0];
var withLength = constructorBindings
.Select(binding => new { Binding = binding, ConstructorParameterLength = binding.TargetConstructor.GetParameters().Length });
var maxLength = withLength.Max(binding => binding.ConstructorParameterLength);
var maximal = withLength
.Where(binding => binding.ConstructorParameterLength == maxLength)
.Select(ctor => ctor.Binding)
.ToArray();
if (maximal.Length == 1)
return maximal[0];
throw new DependencyResolutionException(string.Format(
CultureInfo.CurrentCulture,
MostParametersConstructorSelectorResources.UnableToChooseFromMultipleConstructors,
maxLength,
maximal[0].TargetConstructor.DeclaringType));
}
/// <summary>
/// Selects the best constructor from the available constructors.
/// </summary>
/// <param name="constructorBindings">Available constructors.</param>
/// <returns>The best constructor.</returns>
/// <exception cref='DependencyResolutionException'>A single unambiguous match could not be chosen.</exception>
public ConstructorParameterBinding SelectConstructorBinding(ConstructorParameterBinding[] constructorBindings)
{
if (constructorBindings == null) throw new ArgumentNullException("constructorBindings");
if (constructorBindings.Length == 0) throw new ArgumentOutOfRangeException("constructorBindings");
if (constructorBindings.Length == 1)
return constructorBindings[0];
var withLength = constructorBindings
.Select(binding => new { Binding = binding, ConstructorParameterLength = binding.TargetConstructor.GetParameters().Length });
var maxLength = withLength.Max(binding => binding.ConstructorParameterLength);
var maximal = withLength
.Where(binding => binding.ConstructorParameterLength == maxLength)
.Select(ctor => ctor.Binding)
.ToArray();
if (maximal.Length == 1)
return maximal[0];
throw new DependencyResolutionException(string.Format(
"Cannot choose between multiple constructors with equal length {0} on type '{1}'. Select the constructor explicitly, with the UsingConstructor() configuration method, when the component is registered.",
maxLength,
maximal[0].TargetConstructor.DeclaringType));
}
