Hello,

I tried to add several custom fields for file entities in OneDrive for Business. They should be hidden from end users completely. I've created a custom fields for list called "Documents" using SharePoint CSOM:

                    var list = context.Web.Lists.GetByTitle("Documents");
                    ClientObjectPrototype allFields = list.Fields.RetrieveItems();
                    allFields.Retrieve(FieldPropertyNames.Title, FieldPropertyNames.InternalName);

                    context.ExecuteQuery();
                    if (!list.Fields.Any(f => f.InternalName == "Os33_x002e_CustomProperty5"))
                    {
                        list.Fields.AddFieldAsXml(
                            "<Field Type='Number' Name='Os33.CustomProperty5' Viewable='false' " +
                            "ShowInDisplayForm ='false' ShowInEditForm='false' ShowInFileDialog='false' " +
                            "ShowInFileDlg='false' ShowInListSettings='false' ShowInNewForm='false' " +
                            "ShowInVersionHistory='false' ShowInViewForms='false' " +
                            "Required='false' Hidden='true' Decimals='0' Min='0' DisplayName='Os33.CustomProperty5'><Default>0</Default></Field>",
                            false,
                            AddFieldOptions.AddToAllContentTypes);
                       

                        list.Update();
                        context.ExecuteQuery();
                    }

But editor for field is shown on the file's Property page. How to hide this field?

In order to hide the fields, you could use SetShowInDisplayForm, SetShowInEditForm and SetShowInNewForm.

Field customField = list.Fields.GetByInternalNameOrTitle("<customfieldnameortitle>");
context.ExecuteQuery();

//customField.ReadOnlyField = false;
//customField.Hidden = false;
customField.SetShowInDisplayForm(false);
customField.SetShowInEditForm(false);
customField.SetShowInNewForm(false);
                       

customField.Update();

context.ExecuteQuery();

You could also use the Hidden and Read Only properties as per your requirements.

• Edited by Jibin Johnson 5 hours 56 minutes ago incorrect object name in the code