Hi,

I have a test program that creates 5 threads and each thread uses
XmlDocument.Save(filename) to save a Xml dom to a file. I have put the
lock statement around the Save to prevent from concurrently updating.
However I'm still seeing "System.IO.IOException: The process cannot
access the file "c:\file1.xml" because it is being used by another
process." The following is the test program

public class XmlTest
{
private static void ThreadProc(object o)
{
XmlDocument x1 = new XmlDocument();
x1.AppendChild(x1.CreateElement("test"));

while (running)
{
lock (typeof(XmlTest))
{
try
{
x1.Save(@"c:\file1.xml");
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
}
}
}

//...
}

However, if I change
x1.Save(@"c:\file1.xml");
to
using (StreamWriter sw = new StreamWriter(@"c:\file1.xml"))
{
x1.Save(sw);
}
then it seems to work fine. So I think the XmlDocument.Save(filename)
is not closing the file properly. Is this right?

Thanks,
-hengyi

What version of Framework do you use?
On .NET 2.0 I can't repro this behavior.
It is possible that this was a bug in Framework 1.1 and it is fixed already.
Sergey

<liuhengyi@gmail.com> wrote in message
news:1142040147.131524.18730@u72g2000cwu.googlegro ups.com...[color=blue]
> Hi,
>
> I have a test program that creates 5 threads and each thread uses
> XmlDocument.Save(filename) to save a Xml dom to a file. I have put the
> lock statement around the Save to prevent from concurrently updating.
> However I'm still seeing "System.IO.IOException: The process cannot
> access the file "c:\file1.xml" because it is being used by another
> process." The following is the test program
>
> public class XmlTest
> {
> private static void ThreadProc(object o)
> {
> XmlDocument x1 = new XmlDocument();
> x1.AppendChild(x1.CreateElement("test"));
>
> while (running)
> {
> lock (typeof(XmlTest))
> {
> try
> {
> x1.Save(@"c:\file1.xml");
> }
> catch (Exception ex)
> {
> Console.WriteLine(ex.ToString());
> }
> }
> }
> }
>
> //...
> }
>
> However, if I change
> x1.Save(@"c:\file1.xml");
> to
> using (StreamWriter sw = new StreamWriter(@"c:\file1.xml"))
> {
> x1.Save(sw);
> }
> then it seems to work fine. So I think the XmlDocument.Save(filename)
> is not closing the file properly. Is this right?
>
> Thanks,
> -hengyi
>[/color]