UnityEditor.ProjectWindowUtil.IsFolder C# (CSharp) Method

        public static bool IsFolder(int instanceID)
        {
            return AssetDatabase.IsValidFolder(AssetDatabase.GetAssetPath(instanceID));
        }

        internal static void StartDrag(int draggedInstanceID, List <int> selectedInstanceIDs)
        {
            DragAndDrop.PrepareStartDrag();
            string title = string.Empty;

            if (ProjectWindowUtil.IsFavoritesItem(draggedInstanceID))
            {
                DragAndDrop.SetGenericData(ProjectWindowUtil.k_DraggingFavoriteGenericData, (object)draggedInstanceID);
                DragAndDrop.objectReferences = new UnityEngine.Object[0];
            }
            else
            {
                bool flag = ProjectWindowUtil.IsFolder(draggedInstanceID);
                DragAndDrop.objectReferences = ProjectWindowUtil.GetDragAndDropObjects(draggedInstanceID, selectedInstanceIDs);
                DragAndDrop.SetGenericData(ProjectWindowUtil.k_IsFolderGenericData, !flag ? (object)string.Empty : (object)"isFolder");
                string[] dragAndDropPaths = ProjectWindowUtil.GetDragAndDropPaths(draggedInstanceID, selectedInstanceIDs);
                if (dragAndDropPaths.Length > 0)
                {
                    DragAndDrop.paths = dragAndDropPaths;
                }
                title = DragAndDrop.objectReferences.Length <= 1 ? ObjectNames.GetDragAndDropTitle(InternalEditorUtility.GetObjectFromInstanceID(draggedInstanceID)) : "<Multiple>";
            }
            DragAndDrop.StartDrag(title);
        }