SharePoint - programmatically update elements that stays in previous versions? Is it possible?

Question

I have multiple lines field with these settings:




So I have some records "history" in 'MultipleLinesField':



Is it possible to get ListItem from versions collections and update this field? I understand that I can restore some version to actual, and then change field, but I want to keep order of these records from newest to last. Is it possible in OM?

I tried but no luck. I can get it, but can not change.

                    SPListItem itm = web.Lists["ListWithVersions"].GetItemById(1);

                    string fieldName = itm.Fields["MultipleLinesField"].InternalName;

                    for (int i = 0; i < itm.Versions.Count; i++)
                    {
                        if (itm.Versions[i][fieldName] != null)
                        {
                            Message("Version: " + i + Environment.NewLine + itm.Versions[i][fieldName]);

                            // Error	Property or indexer 'Microsoft.SharePoint.SPListItemVersion.this[string]' cannot be assigned to -- it is read only
                            itm.Versions[i][fieldName] = "asdfgh";

                            // Error	Cannot convert type 'Microsoft.SharePoint.SPListItemVersion' to 'Microsoft.SharePoint.SPListItem'
                            ((SPListItem)itm.Versions[i]).SystemUpdate();
                        }
                    }

          

Answer 1

No, the listitem.versions collection is read only and cannot be edited. The only option is to create a new list item and rebuild the history from the first version to the latest, amending the metadata on the way.

This thread shows how you can rebuild a version history from scratch. https://social.msdn.microsoft.com/Forums/office/en-US/70400ac7-bb0e-4353-ac36-990133b04447/how-to-update-the-system-generated-fields-such-as-created-created-by-modified-modified-by-and?forum=sharepointdevelopment#205f884c-0dfb-4ed7-bdb8-4f273e5742e0

Paul.

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Answer 2

Hi,

As Cimares said you can edit the version history for the same item as you wish but you can try with adding different item or you can try with calculated column

http://www.endusersharepoint.com/2009/10/23/taming-the-elusive-calculated-column-referencing-a-multiple-lines-of-text-column-with-append-text-part-3/

And this as well.

http://blog.henryong.com/2009/04/17/showing-sharepoint-read-only-fields-in-the-version-history-powershell-script/

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KRISHANA KUMAR

SharePoint Architect

Mosstechnet-kk.com

 

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Answer 3

Thank You guys for responses!

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