Unable to rename document name on ItemAdded event programmatically

Question

Hi,
I have developed a Event Receiver on Item Added event basically to update the document name after document gets uploaded to SharePoint Library.
I have developed below code but its getting failed at on Item.Update(); function call. Referred this
MSDN Blog.
public override void ItemAdded(SPItemEventProperties properties)
           base.ItemAdded(properties);
           try
               SPListItem item = properties.ListItem;
               string draftAuthor = item["Author"].ToString();
               int index = draftAuthor.IndexOf("#");
               string finalAuthor = draftAuthor.Substring(index+1, draftAuthor.Length-index-1);
               updatedTitle = "My Dashboard- "+  finalAuthor;
               item.File.CheckOut();
               item["Name"] = updatedTitle;
item.Update(); // Getting failed here
               item.File.CheckIn("File has been renamed");
           catch (Exception ex)
               string error = "Error in event overriding : " + ex.ToString();
               myLog.Source = "My Dashboard Extension";
               myLog.WriteEntry(error, EventLogEntryType.Error, 4700);
Getting below error
Error in event overriding : Microsoft.SharePoint.SPException: Invalid data has been used to update the list item. The field you are trying to update may be read only. ---> System.Runtime.InteropServices.COMException (0x80020005): <nativehr>0x80020005</nativehr><nativestack></nativestack>Invalid
data has been used to update the list item. The field you are trying to update may be read only.
Please suggest me how can I make this piece of code work.
Thanks !!!

Answer 1

Hi,
We should use the MoveTo method to rename the file name. The following code snippets for your reference.
base.ItemAdded(properties);
properties.ListItem["Title"] = properties.ListItem.File.Name;
properties.ListItem.Update();
SPFile file = properties.ListItem.File;
// Get the extension of the file. We need that later.
string spfileExt = new FileInfo(file.Name).Extension;
// Rename the file to the list item's ID and use the file extension to keep
// that part of it intact.
file.MoveTo(properties.ListItem.ParentList.RootFolder.Url +
"/" + properties.ListItem["ID"] + spfileExt);
// Commit the move.
file.Update();
Thanks & Regards,
Jason
Jason Guo
TechNet Community Support