Question on GC and delegates

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Satish Gidugu - 21 Aug 2004 08:13 GMT

I posted this problem originally on the xml group. I have an app that
processes XmlDocument and uses XmlElement.GetElementsByTagName quite
liberally for various operations. It appears that the XmlNodeList (actually a
subtree) returned by this method internally hooks itself to the document's
NodeInserted and NodeRemoved events. After a while, inserting an element into
the document takes close to 12 seconds on a PIII 1.8GHz 512MB machine because
each instance of the XmlNodeList is notified about the insertion.

All references to the XmlNodeList are only local variables with method scope.

Q1: Is there some way I can clear the listener collection of the
XmlDocument's events?
Q2: Does forcing a GC.Collect() help in these kind of cases?

I currently clone the XmlDocument at regular intervals to keep the
performance reasonable. This makes the app run 25 times faster.

many thanks,
Satish

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Dmitriy Zaslavskiy - 22 Aug 2004 04:27 GMT

GC.Collect will not help. It's kind of by design.
Also consider using XPathDocument instead as it solves this and other
problems.

>I posted this problem originally on the xml group. I have an app that
> processes XmlDocument and uses XmlElement.GetElementsByTagName quite
[quoted text clipped - 19 lines]
> many thanks,
> Satish

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Sankar Nemani - 23 Aug 2004 22:40 GMT

You can use reflection to actually remove the handler(s). This approach
probably is not recommended but if you have no other choice you can use it.

> GC.Collect will not help. It's kind of by design.
> Also consider using XPathDocument instead as it solves this and other
[quoted text clipped - 23 lines]
> > many thanks,
> > Satish

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Question on GC and delegates

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