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");
     }

is this file used by only single application ?

user1360355
– user1360355

2015-08-12 09:51:57 +00:00
Commented Aug 12, 2015 at 9:51 — user1360355
– user1360355, Commented Aug 12, 2015 at 9:51
stackoverflow.com/questions/1025407/…

user1360355
– user1360355

2015-08-12 09:55:21 +00:00
Commented Aug 12, 2015 at 9:55 — user1360355
– user1360355, Commented Aug 12, 2015 at 9:55
yes. it's the only application that uses this method.

anastasia2
– anastasia2

2015-08-12 13:50:36 +00:00
Commented Aug 12, 2015 at 13:50 — anastasia2
– anastasia2, Commented Aug 12, 2015 at 13:50
You need to use lock while load and save file...

user1360355
– user1360355

2015-08-13 07:07:04 +00:00
Commented Aug 13, 2015 at 7:07 — user1360355
– user1360355, Commented Aug 13, 2015 at 7:07
sounds good. but how do i do this?

anastasia2
– anastasia2

2015-08-13 12:40:40 +00:00
Commented Aug 13, 2015 at 12:40 — anastasia2
– anastasia2, Commented Aug 13, 2015 at 12:40

ArBel · Accepted Answer · 2015-08-12 09:43:25Z

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, 2015 at 9:43

ArBel

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user1360355 · Accepted Answer · 2015-08-13 12:52:35Z

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, 2015 at 12:52

user1360355

2 Comments

anastasia2 Over a year ago

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.

user1360355 Over a year ago

another location means ? you added lock everywhere with the same object right ?

ergohack · Accepted Answer · 2019-04-16 00:35:29Z

0

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();

answered Apr 16, 2019 at 0:35

ergohack

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