Change document name in event receiver

Question

I need to rename a document during an ItemUpdating or an ItemUpdated event. Either one would be fine. When my user changes the file name, I want my code to set it to something else. In the examples below, I am trying to set it to a silly constant value.
If I can get this to work, I'll change it to use something meaningful.
Is there any way to change a document's name in an event receiver? I have tried using ItemUpdated (with <Synchronization>Synchronous</Synchronization> in elements.xml). I have tried this:
public override void ItemUpdated(SPItemEventProperties properties)
using (DisabledEventsScope scope = new DisabledEventsScope())
base.ItemUpdated(properties);
try
properties.Web.AllowUnsafeUpdates = true;
properties.ListItem.File.Properties["FileLeafRef"] = "FOOFOO.docx";
properties.ListItem.File.Update();
properties.Web.AllowUnsafeUpdates = false;
catch (Exception ex)
properties.ErrorMessage = "Document cannot be renamed." + ex.Message;
properties.Status = SPEventReceiverStatus.CancelWithError;
//base.ItemUpdated(properties);
I have also tried this:
public override void ItemUpdated(SPItemEventProperties properties)
using (DisabledEventsScope scope = new DisabledEventsScope())
base.ItemUpdated(properties);
try
properties.Web.AllowUnsafeUpdates = true;
properties.AfterProperties["FileLeafRef"] = "FOOFOO.docx";
properties.ListItem.Update();
properties.Web.AllowUnsafeUpdates = false;
catch (Exception ex)
properties.ErrorMessage = "Document cannot be renamed." + ex.Message;
properties.Status = SPEventReceiverStatus.CancelWithError;
//base.ItemUpdated(properties);
And in that last one, I also tried setting properties.ListItem["FileLeafRef"]. I have also tried putting the base.ItemUpdated line after my logic (where you see it commented out above).
Nothing works. No errors are thrown, but the document name stays the way the user set it.
Leigh Webber

Answer 1

There's three things you have to do in order to update the name properties:
Assign properties.ListItem to a variable
Update the BaseName field
Update the Type field (if you wish to change the extension)
public override void ItemUpdated(SPItemEventProperties properties)
EventFiringEnabled = false;
base.ItemUpdated(properties);
var item = properties.ListItem; item["BaseName"] = "BarBar";
item["Type"] = "docx"; //If you need to change the extension
item.Update();
EventFiringEnabled = true;
This should fix your issue