R – Copy SharePoint SPListItem while preventing new workflows or modifications

There are two parts to a workflow in SharePoint - .net code and xml configuration.

For changes in the code, you can make changes and redeploy your solution package - as long as the strong name of the assembly doesn't change the new code will get called the next time an event occurs on an existing workflow. You just need to be careful when making changes that your code doesn't assume that the workflow was started using the current code.

Any changes in the xml configuration (effectively the interface definition for the workflow) will require the more complete new deployment.

Here is the code I use. Pass it a SPlistItem and the name of the destination list as seen in Sharepoint(Not the URL). The only restriction is that both list must be in the same site:

private SPListItem CopyItem(SPListItem sourceItem, string destinationListName) {
        //Copy sourceItem to destinationList
        SPList destinationList = sourceItem.Web.Lists[destinationListName];
        SPListItem targetItem = destinationList.Items.Add();
        foreach (SPField f in sourceItem.Fields) {
            //Copy all except attachments.
            if (!f.ReadOnlyField && f.InternalName != "Attachments"
                && null != sourceItem[f.InternalName])
            {
                targetItem[f.InternalName] = sourceItem[f.InternalName];
            }
        }
        //Copy attachments
        foreach (string fileName in sourceItem.Attachments) {
            SPFile file = sourceItem.ParentList.ParentWeb.GetFile(sourceItem.Attachments.UrlPrefix + fileName);
            byte[] imageData = file.OpenBinary();
            targetItem.Attachments.Add(fileName, imageData);
        }

        return targetItem;
    }