Document Set created programmtically not working anymore since 12 Jan 2021

Question

Hi Expert,

Document Set that created programmatically not working since 2 days ago on Tuesday 12 Jan 2021. Below is the screenshot showing the document set created with folder icon instead of Document Set icon like the last 2 records.

I am using SharePoint online. Could you please let me know is there any upgrade happened 2 days ago? Any solution for this issues? Below you can also find the code that uses to create the document set folder.

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Code Snippet

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                    var listTitle = WebConfigurationManager.AppSettings.Get("CentralisedLibrary");  
                    var list = clientContext.Web.Lists.GetByTitle(listTitle);  

                    ListItemCreationInformation newItemInfo = new ListItemCreationInformation();  

                    newItemInfo.UnderlyingObjectType = FileSystemObjectType.Folder;  

                    newItemInfo.LeafName = BLNo.Trim();  

                    ListItem newListItem = list.AddItem(newItemInfo);  

                    newListItem["ContentTypeId"] = WebConfigurationManager.AppSettings.Get("CentralisedDocumentSetID");  

                    newListItem["BLNo"] = BLNo;  
                    newListItem["_Category"] = BOLFolderProperties.Category;  
                    newListItem["Region"] = BOLFolderProperties.Region;  
                    if (Utilities.IsValidDateField(BOLFolderProperties.ShipAirDate))  
                        newListItem["ShipAirDate"] = Convert.ToDateTime(BOLFolderProperties.ShipAirDate);  
                    newListItem["ShipmentMode"] = BOLFolderProperties.ShipmentMode;  
                    newListItem["ContainerNo"] = Utilities.FormatSplitValues(BOLFolderProperties.ContainerNo);  
                    newListItem["PONo"] = Utilities.FormatSplitValues(BOLFolderProperties.PONo);  
                    newListItem["ShipperName"] = vendorListData.VendorListTitle;  
                    newListItem["ActualCreator"] = vendorListData.VendorListTitle;  

                    newListItem.Update();  

                    clientContext.Load(newListItem);  

                    clientContext.ExecuteQuery();  

Answer 1

Hi @Lecus Soh ,

Per my test, I could reproduce your issue on my tenant. This seems to be some changes in SharePoint Online after 12th January. And I find the same issue in this thread: https://sharepoint.stackexchange.com/questions/288764/sharepoint-online-javascript-creates-folder-instead-of-document-set/288820#288820

I find something interesting: the icon of the document set displays normal in modern experience,however it displays folder icon in classic experience.

I find a temporary solution to this issue: use the list.contentTypeID instead of web.ContentTypeID. To get the list contenttype id, go to library settings, click the document set content type. You could find it in the url.

Use this list contentTypeID would fix this:

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