public static IWrappedList CreateListWrapper(object list)
{
ValidationUtils.ArgumentNotNull(list, "list");
Type listDefinition;
if (ReflectionUtils.IsSubClass(list.GetType(), typeof(IList <>), out listDefinition))
{
Type listItemType = ReflectionUtils.GetListItemType(listDefinition);
// Activator.CreateInstance throws AmbiguousMatchException. Manually invoke constructor
Func <Type, IList <object>, object> instanceCreator = (t, a) =>
{
ConstructorInfo c = t.GetConstructor(new[] { listDefinition });
return(c.Invoke(new[] { list }));
};
return((IWrappedList)ReflectionUtils.CreateGeneric(typeof(ListWrapper <>), new[] { listItemType }, instanceCreator, list));
}
else if (list is IList)
{
return(new ListWrapper <object>((IList)list));
}
else
{
throw new Exception("Can not create ListWrapper for type {0}.".FormatWith(CultureInfo.InvariantCulture, list.GetType()));
}
}
public static IList CreateAndPopulateList(Type listType, Action <IList> populateList)
{
ValidationUtils.ArgumentNotNull(listType, "listType");
ValidationUtils.ArgumentNotNull(populateList, "populateList");
IList list;
Type readOnlyCollectionType;
bool isReadOnlyOrFixedSize = false;
if (listType.IsArray)
{
// have to use an arraylist when creating array
// there is no way to know the size until it is finised
list = new ArrayList();
isReadOnlyOrFixedSize = true;
}
else if (ReflectionUtils.IsSubClass(listType, typeof(ReadOnlyCollection <>), out readOnlyCollectionType))
{
Type readOnlyCollectionContentsType = readOnlyCollectionType.GetGenericArguments()[0];
Type genericEnumerable = ReflectionUtils.MakeGenericType(typeof(IEnumerable <>), readOnlyCollectionContentsType);
bool suitableConstructor = false;
foreach (ConstructorInfo constructor in listType.GetConstructors())
{
IList <ParameterInfo> parameters = constructor.GetParameters();
if (parameters.Count == 1)
{
if (genericEnumerable.IsAssignableFrom(parameters[0].ParameterType))
{
suitableConstructor = true;
break;
}
}
}
if (!suitableConstructor)
{
throw new Exception(string.Format("Readonly type {0} does not have a public constructor that takes a type that implements {1}.", listType, genericEnumerable));
}
// can't add or modify a readonly list
// use List<T> and convert once populated
list = (IList)CreateGenericList(readOnlyCollectionContentsType);
isReadOnlyOrFixedSize = true;
}
else if (typeof(IList).IsAssignableFrom(listType) && ReflectionUtils.IsInstantiatableType(listType))
{
list = (IList)Activator.CreateInstance(listType);
}
else
{
throw new Exception(string.Format("Cannot create and populate list type {0}.", listType));
}
populateList(list);
// create readonly and fixed sized collections using the temporary list
if (isReadOnlyOrFixedSize)
{
if (listType.IsArray)
{
list = ((ArrayList)list).ToArray(ReflectionUtils.GetListItemType(listType));
}
else if (ReflectionUtils.IsSubClass(listType, typeof(ReadOnlyCollection <>)))
{
list = (IList)Activator.CreateInstance(listType, list);
}
}
return(list);
}