/// <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));
}
ConstructorParameterBinding[] GetConstructorBindings(
IComponentContext context,
IEnumerable <Parameter> parameters,
IEnumerable <Parameter> _defaultParameters,
ConstructorInfo[] constructorInfo)
{
var prioritisedParameters = parameters.Concat(_defaultParameters).ToArray();
var result = new ConstructorParameterBinding[constructorInfo.Length];
for (int i = 0; i < constructorInfo.Length; i++)
{
result[i] = new ConstructorParameterBinding(constructorInfo[i], prioritisedParameters, context);
}
return(result);
}
/// <summary>
/// Selects the best constructor from the available constructors.
/// </summary>
/// <param name="constructorBindings">Available constructors.</param>
/// <returns>The best constructor.</returns>
public ConstructorParameterBinding SelectConstructorBinding(ConstructorParameterBinding[] constructorBindings)
{
if (constructorBindings == null) throw new ArgumentNullException("constructorBindings");
var result = constructorBindings
.Where(b => b.TargetConstructor.GetParameters().Select(p => p.ParameterType).SequenceEqual(_signature))
.ToArray();
if (result.Length == 1)
return result[0];
if (!constructorBindings.Any())
throw new ArgumentException("At least one binding must be provided in order to select a constructor.");
var targetTypeName = constructorBindings.First().TargetConstructor.DeclaringType.Name;
var signature = string.Join(", ", _signature.Select(t => t.Name).ToArray());
if (result.Length == 0)
throw new DependencyResolutionException(string.Format("The required constructor on type '{0}' with signature '{1}' is unavailable.", targetTypeName, signature));
throw new DependencyResolutionException(string.Format("More than one constructor matches the signature '{0}'.", signature));
}
/// <summary>
/// Selects the best constructor from the available constructors.
/// </summary>
/// <param name="constructorBindings">Available constructors.</param>
/// <returns>The best constructor.</returns>
public ConstructorParameterBinding SelectConstructorBinding(ConstructorParameterBinding[] constructorBindings)
{
if (constructorBindings == null) throw new ArgumentNullException("constructorBindings");
var result = constructorBindings
.Where(b => b.TargetConstructor.GetParameters().Select(p => p.ParameterType).SequenceEqual(_signature))
.ToArray();
if (result.Length == 1)
return result[0];
if (!constructorBindings.Any())
throw new ArgumentException(MatchingSignatureConstructorSelectorResources.AtLeastOneBindingRequired);
var targetTypeName = constructorBindings.First().TargetConstructor.DeclaringType.Name;
var signature = string.Join(", ", _signature.Select(t => t.Name).ToArray());
if (result.Length == 0)
throw new DependencyResolutionException(string.Format(MatchingSignatureConstructorSelectorResources.RequiredConstructorNotAvailable, targetTypeName, signature));
throw new DependencyResolutionException(string.Format(MatchingSignatureConstructorSelectorResources.TooManyConstructorsMatch, signature));
}
ConstructorParameterBinding[] GetConstructorBindings(
IComponentContext context,
IEnumerable<Parameter> parameters,
IEnumerable<Parameter> _defaultParameters,
ConstructorInfo[] constructorInfo)
{
var prioritisedParameters = parameters.Concat(_defaultParameters).ToArray();
var result = new ConstructorParameterBinding[constructorInfo.Length];
for (int i = 0; i < constructorInfo.Length; i++)
result[i] = new ConstructorParameterBinding(constructorInfo[i], prioritisedParameters, context);
return result;
}
