private static IEnumerable <object> GetArgumentsForConstructor(ResolvedConstructor constructor)
{
// Interface proxy creation requires a null argumentsForConstructor, and null also works
// for parameterless class constructors, so reduce an empty argument list to null.
return(constructor.Arguments.Any()
? constructor.Arguments.Select(x => x.ResolvedValue)
: null);
}
public override CreationResult TryCreateDummyValue(DummyCreationSession session, Type typeOfDummy)
{
if (typeof(Delegate).IsAssignableFrom(typeOfDummy))
{
return(CreationResult.FailedToCreateDummy(typeOfDummy, "It is a Delegate."));
}
if (typeOfDummy.GetTypeInfo().IsAbstract)
{
return(CreationResult.FailedToCreateDummy(typeOfDummy, "It is abstract."));
}
// Save the constructors as we try them. Avoids eager evaluation and double evaluation
// of constructors enumerable.
var consideredConstructors = new List <ResolvedConstructor>();
if (this.cachedConstructors.TryGetValue(typeOfDummy, out ConstructorInfo cachedConstructor))
{
var resolvedConstructor = new ResolvedConstructor(
cachedConstructor.GetParameters().Select(pi => pi.ParameterType),
session,
this.Resolver);
if (resolvedConstructor.WasSuccessfullyResolved)
{
if (TryCreateDummyValueUsingConstructor(cachedConstructor, resolvedConstructor, out object result))
{
return(CreationResult.SuccessfullyCreated(result));
}
consideredConstructors.Add(resolvedConstructor);
}
}
else
{
foreach (var constructor in GetConstructorsInOrder(typeOfDummy))
{
var resolvedConstructor = new ResolvedConstructor(
constructor.GetParameters().Select(pi => pi.ParameterType),
session,
this.Resolver);
if (resolvedConstructor.WasSuccessfullyResolved && TryCreateDummyValueUsingConstructor(constructor, resolvedConstructor, out object result))
{
this.cachedConstructors[typeOfDummy] = constructor;
return(CreationResult.SuccessfullyCreated(result));
}
consideredConstructors.Add(resolvedConstructor);
}
}
if (consideredConstructors.Any())
{
return(CreationResult.FailedToCreateDummy(typeOfDummy, consideredConstructors));
}
return(CreationResult.FailedToCreateDummy(typeOfDummy, "It has no public constructors."));
}
private static bool TryCreateDummyValueUsingConstructor(ConstructorInfo constructor, ResolvedConstructor resolvedConstructor, out object result)
{
try
{
result = constructor.Invoke(resolvedConstructor.Arguments.Select(a => a.ResolvedValue).ToArray());
return(true);
}
catch (TargetInvocationException e)
{
result = default;
resolvedConstructor.ReasonForFailure = e.InnerException.Message;
return(false);
}
}
private static IEnumerable <object?> GetArgumentsForConstructor(ResolvedConstructor constructor) => constructor.Arguments.Select(x => x.ResolvedValue);
