Error Code: 3604 when deleting file from SharePoint Document Library

I'm developing a WebPart in SharePoint 2007 and sometimes when I try to delete a file from Document Library with code like this:

SPWeb web = SPControl.GetContextWeb(WebPart.WebPartContext);

SPList list = web.GetList(web.Site.Url + "/ListName");

SPFile file = list.GetItemByUniqueId(new Guid(fileId)).File;

file.Delete();

I get following Exception:

Cannot remove file "filename.bmp". Error Code: 3604.


Stack Trace: 
at Microsoft.SharePoint.Library.SPRequest.AddOrDeleteUrl(String bstrUrl, String bs开发者_运维问答trDirName, Boolean bAdd, UInt32 dwDeleteOp, Int32 iUserId, Guid& pgDeleteTransactionId)
at Microsoft.SharePoint.SPFile.DeleteCore(DeleteOp deleteOp)
at Microsoft.SharePoint.SPFile.Delete()

The SPFile object is not null.

Any ideas why that's happening?

The only possible thing I can think of is that the file is currently checked out or locked for editing by another user. Try this...

SPWeb web = SPControl.GetContextWeb(WebPart.WebPartContext);
SPList list = web.GetList(web.Site.Url + "/ListName");
SPFile file = list.GetItemByUniqueId(new Guid(fileId)).File;

if (file.CheckOutStatus != SPFile.SPCheckOutStatus.None)
{
  file.UndoCheckOut();
  file.CheckOut();
}

file.Delete();

Are you deleting a file from a document library?

If so, you need delete whole item, because document library item cannot exist without a file. So you need to change your code this way:

SPWeb web = SPControl.GetContextWeb(WebPart.WebPartContext);
SPList list = web.GetList(web.Site.Url + "/ListName");
// delete whole item
SPListItem itemToDelete = list.GetItemByUniqueId(new Guid(fileId));
itemToDelete.Delete();

Hope it helps!