public static bool TryGetCollectionElementType()

in extensions/Worker.Extensions.Shared/Reflection/TypeExtensions.cs [40:80]

32 lines of code
10 McCabe index (conditional complexity)


        public static bool TryGetCollectionElementType(this Type type, out Type? elementType)
        {
            elementType = null;
            if (!type.IsCollectionType())
            {
                return false;
            }

            // Check if the type is an array
            if (type.IsArray)
            {
                elementType = type.GetElementType();
                return true;
            }

            if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(IEnumerable<>))
            {
                elementType = type.GetGenericArguments()[0];
                return true;
            }

            // if generic, get generic type definition, check if that is IEnumerable<>, ICollection<> or IList<>. If so, then pull off the first generic argument.
            // Traverse the inheritance hierarchy to find the first generic interface
            while (type is not null)
            {
                var interfaceType = type.GetInterfaces().FirstOrDefault(t => t.IsGenericType
                    && (t.GetGenericTypeDefinition() == typeof(IEnumerable<>)
                    || t.GetGenericTypeDefinition() == typeof(ICollection<>)
                    || t.GetGenericTypeDefinition() == typeof(IList<>)));

                if (interfaceType is not null)
                {
                    elementType = interfaceType.GetGenericArguments()[0];
                    return true;
                }

                type = type.BaseType!;
            }

            return false;
        }