private bool IsReadOnlyCollectionInterface()
{
#if NET_STANDARD
return(EnumerableType.IsClosedTypeOf(typeof(IReadOnlyCollection <>)));
#else
return(EnumerableType.IsInterface() &&
(EnumerableType.Name == "IReadOnlyCollection`1") &&
EnumerableType.IsFromBcl());
#endif
}
public bool CouldBeReadOnly()
{
if (_couldBeReadOnly.HasValue)
{
return(_couldBeReadOnly.Value);
}
if (EnumerableType.IsInterface())
{
// If the declared Type is an interface it could have an 'Add' method
// while the underlying, implementing Type is actually readonly:
return((_couldBeReadOnly = true).Value);
}
// If the declared Type declares an 'Add' method, assume it's not readonly;
// Array implements ICollection<>, but its Add method is implemented explicitly:
return((_couldBeReadOnly = EnumerableType.GetPublicInstanceMethods("Add").None()).Value);
}
public Type GetEmptyInstanceCreationFallbackType()
{
if (IsArray)
{
return(ListType);
}
if (!EnumerableType.IsInterface())
{
return(EnumerableType);
}
if (IsDictionary)
{
return(typeof(Dictionary <,>).MakeGenericType(EnumerableType.GetGenericTypeArguments()));
}
return(HasSetInterface ? HashSetType : ListType);
}
public Expression GetNewInstanceCreation()
{
return(IsReadOnly || EnumerableType.IsInterface()
? Expression.New(ListType)
: GetEmptyInstanceCreation());
}