private static object AttemptConstruction(object[] parameters, IEnumerable <KeyValuePair <ConstructorInfo, ParameterInfo[]> > ctors, bool matchExactType)
{
foreach (var info in ctors)
{
var parametersCopy = new object[info.Value.Length];
for (var i = 0; i < info.Value.Length; i++)
{
var param = info.Value[i];
if (parameters != null && parameters.Length > i)
{
var item = parameters[i];
if (item != null && (matchExactType ? param.ParameterType != item.GetType()
: !param.ParameterType.GetTypeInfo().IsAssignableFrom(item.GetType().GetTypeInfo())))
{
parametersCopy = null;
break;
}
parametersCopy[i] = item;
}
else if ((param.Attributes & ParameterAttributes.HasDefault) == ParameterAttributes.HasDefault)
{
parametersCopy[i] = param.DefaultValue;
}
else
{
parametersCopy[i] = MXContainer.Resolve(param.ParameterType, null, null);
if (parametersCopy[i] != null)
{
continue;
}
parametersCopy = null;
break;
}
}
if (parametersCopy != null)
{
return(info.Key.Invoke(parametersCopy));
}
}
return(null);
}
/// <summary>
/// Returns the managed instance.
/// </summary>
/// <param name="parameters">An array of constructor parameters for initialization.</param>
/// <returns>The object instance.</returns>
public object Load(params object[] parameters)
{
if (_instanceType == null)
{
return(null);
}
if (Instance != null)
{
return(Instance);
}
object retval;
if (_initialize == null)
{
try
{
var ctors = _instanceType.GetTypeInfo().DeclaredConstructors;
if (parameters == null || parameters.Length == 0)
{
var info = ctors.Select(c => new { ctor = c, param = c.GetParameters() })
.OrderBy(i => i.param.Length)
.Select(p => new { p.ctor, param = p.param.Select(res => MXContainer.Resolve(res.ParameterType, null, null)) })
.FirstOrDefault(v => v.param.All(o => o != null));
retval = info != null?info.ctor.Invoke(info.param.ToArray()) : Activator.CreateInstance(_instanceType);
}
else
{
var ctor = ctors.FirstOrDefault(c =>
{
var p = c.GetParameters();
return(p.Length == parameters.Length && !p.Where((t, i) => parameters[i] != null && !t.ParameterType.GetTypeInfo().IsAssignableFrom(parameters[i].GetType().GetTypeInfo())).Any());
});
retval = ctor == null?Activator.CreateInstance(_instanceType) : ctor.Invoke(parameters);
}
}
catch (MissingMemberException)
{
retval = Activator.CreateInstance(_instanceType);
}
}
else
{
retval = _initialize(parameters);
}
if (_singletonInstance)
{
_instance = retval;
}
return(retval);
}
