How to resolve IOException "file used by another process" while saving XmlDocument?

Question

When I'm trying to save the XML Document I edited the IOException "file used by another process" occured when I try to save that document. Any ideas how to solve this?

Note: This method is called everytime a new element in the XmlDocument should be written.

    public void saveRectangleAsXMLFragment()
    {
            XmlDocument doc = new XmlDocument();

            doc.Load("test.xml");

            XmlDocumentFragment xmlDocFrag = doc.CreateDocumentFragment();

            String input = generateXMLInput();
            xmlDocFrag.InnerXml = input;

            XmlElement mapElement = doc.DocumentElement;
            mapElement.AppendChild(xmlDocFrag);

            input = null;
            mapElement = null;
            xmlDocFrag = null;

            doc.Save("test.xml");
     }

http://stackoverflow.com/questions/1025407/system-io-ioexception-file-used-by-another-process — , Aug 12 '15 at 09:55
Make sure you correctly close the file or you don't have another thread (or program) using it — glautrou, Aug 13 '15 at 13:18

score 0 · Answer 1 · answered Aug 12 '15 at 09:43

0

Its probably one of your other methods, or other part of the code which opened the file and didnt calose it well. Try to search for this kind of problem.

answered Aug 12 '15 at 09:43

ArBel

79
10

score 0 · Answer 2 · answered Aug 13 '15 at 12:52

0

try this if your's application is only access that .xml file

1. Create a Object globally

object lockData = new object();

2.Use than object to lock statement where you save and load xml

lock(lockData )
{
     doc.Load("test.xml");
}   

lock(lockData )
{
     doc.Save("test.xml");
}

answered Aug 13 '15 at 12:52

the exception still occures. at another location but still. because my programm always calls methods that edit the current xml file in style of the code i wrote above. – anastasia2 Aug 13 '15 at 14:20
another location means ? you added lock everywhere with the same object right ? – Aug 13 '15 at 15:18

score 0 · Answer 3 · answered Apr 16 '19 at 00:35

From Jon Skeet's related answer (see https://stackoverflow.com/a/8354736/4151626)

There seems to be a bug in XmlDocument.Save()'s treatment of the file stream, where it becomes pinned and is neither Closed() nor Disposed(). By taking direct control of the creation and disposition of the stream outside of the XmlDocument.Save() I was able to get around this halting error.

//e.g.
XmlWriter xw = new XmlWriter.Create("test.xml");
doc.Save(xw);
xw.Close();
xw.Dispose();

How to resolve IOException "file used by another process" while saving XmlDocument?

3 Answers3