请问一下，我想在opm中根据选中的管线获取管线上的支吊架如何实现呢？

        private static string Relationship = "DEVICE_HAS_SUPPORT";
        public static void Run()
        {
            // pipe
            Element element = Utils.Utils.GetASelectedElement();
            if (element == null)
            {
                return;
            }

            var instances = DgnECManager.Manager.GetElementProperties(element, ECQueryProcessFlags.SearchAllClasses);
            var instance = instances.ElementAt(1);//pipeInstance
            List<IECRelationshipInstance> relationships = DgnUtilities.GetAllRelationshipInstances(instance).Where(e => e.ClassDefinition.Name == Relationship).ToList();
            foreach (var relationship in relationships)
            {
                IECInstance support = relationship.Target;
                var id = (support as IDgnECInstance).Element.ElementId;
            }
        }

        private static string Relationship = "DEVICE_HAS_SUPPORT";
        public static void Run()
        {
            // pipe
            Element element = Utils.Utils.GetASelectedElement();
            if (element == null)
            {
                return;
            }

            var instances = DgnECManager.Manager.GetElementProperties(element, ECQueryProcessFlags.SearchAllClasses);
            var instance = instances.ElementAt(1);//pipeInstance
            List<IECRelationshipInstance> relationships = DgnUtilities.GetAllRelationshipInstances(instance).Where(e => e.ClassDefinition.Name == Relationship).ToList();
            foreach (var relationship in relationships)
            {
                IECInstance support = relationship.Target;
                var id = (support as IDgnECInstance).Element.ElementId;
            }
        }

谢谢，我去试一下

我去实验了一下，好像没有取到，我得到的RelationshipInstances是以下这些，没有DEVICE_HAS_SUPPORT，不知道哪里的问题

有没有可能，您选的那根管道上，他就没有support呢？

有是肯定有，我用ScanCriteria这个类然后用选中的管道的Range扫描到所有对象，然后取得对象的所有的IECInstance, 然后再查找这些的BaseClasses,找到父类是 [ "PipingSupport", "PIPE_SUPPORT" ]的，取到3个，然后我看图上也是三个，但是这个方法感觉很绕的感觉

我从模型观察也是这个情况，应该是对的