Starting to read xml part way through a file

[Xerox]

Are any of the xml streaming classes able to start reading from an xml file
part way through?

Say you have the following xml:

<root>
<elem val = "1"/>
<elem val = "2"/> **<>**
<elem val = "3"/>
</root>

Is it possible for any of the Xml streaming classes to pick up reading the
data indicated by **<>** and continue on as normal?

Thanks

[Xerox]

What I really want to be able to do is create an XmlReader that I can detach
from a stream. Persist the XmlReader's state, then reattach it to the stream
at a later date and have the XmlReader advance up to where it was in the
stream instantly by doing a seek on the stream.

That's not much to ask!

I assume XmlReader is not up to the job. Bar writing my own xml reader, is
there anything out there in the .net community to achieve something similar?
"Xerox" <an**@anon.com> wrote in message
news:#h**************@tk2msftngp13.phx.gbl...

Are any of the xml streaming classes able to start reading from an xml file part way through?

Say you have the following xml:

<root>
<elem val = "1"/>
<elem val = "2"/> **<>**
<elem val = "3"/>
</root>

Is it possible for any of the Xml streaming classes to pick up reading the
data indicated by **<>** and continue on as normal?

Thanks

[Oleg Tkachenko [MVP]]

Xerox wrote:

What I really want to be able to do is create an XmlReader that I can detach
from a stream. Persist the XmlReader's state, then reattach it to the stream
at a later date and have the XmlReader advance up to where it was in the
stream instantly by doing a seek on the stream.

I think it should work unless you are modifying stream, why not? But
what's the point?

--
Oleg Tkachenko [XML MVP, MCP]
http://blog.tkachenko.com

[Xerox]

Well, Xml Reader does not support that scenario unfortunately. It expects to
start from the beginning of the document.

My requirement is to be able to part process an xml file, then complete the
processing later on. This could even be after a system reboot! And the files
could be very large. Say 200mb or more. It must be stream based xml
processing, and I don't want to have to start reading from the start because
the files will be coming over the network.

I am considering developing such a facililty myself but don't fancy coding
xml parsing from scratch. Are there any helper libraries out there that
could relieve some of the burden?

Thanks

"Oleg Tkachenko [MVP]" <oleg@NO!SPAM!PLEASEtkachenko.com> wrote in message
news:%2****************@TK2MSFTNGP15.phx.gbl...

Xerox wrote:

What I really want to be able to do is create an XmlReader that I can detach from a stream. Persist the XmlReader's state, then reattach it to the stream at a later date and have the XmlReader advance up to where it was in the
stream instantly by doing a seek on the stream.

I think it should work unless you are modifying stream, why not? But
what's the point?

--
Oleg Tkachenko [XML MVP, MCP]
http://blog.tkachenko.com

[Xerox]

Okay. On closer inspection it might just be able to do what I want.

There is a method on XmlTextReader called GetRemainder that returns what is
left in its buffer. If I record the current position in the underlying
stream and combine it with the buffer contents I could get somewhere.

In the mean time, any pointers welcome!

Thanks

"Oleg Tkachenko [MVP]" <oleg@NO!SPAM!PLEASEtkachenko.com> wrote in message
news:#6**************@TK2MSFTNGP15.phx.gbl...

Xerox wrote:

What I really want to be able to do is create an XmlReader that I can detach from a stream. Persist the XmlReader's state, then reattach it to the stream at a later date and have the XmlReader advance up to where it was in the
stream instantly by doing a seek on the stream.

I think it should work unless you are modifying stream, why not? But
what's the point?

--
Oleg Tkachenko [XML MVP, MCP]
http://blog.tkachenko.com

[Xerox]

Non starter. GetRemainder returns the entire remainder of the stream, not
just what is left in the buffer. It must also load the entire remainder in
to memory because when I close the underlying stream it still works. Oh
well.

"Xerox" <in**@thinkscape.com> wrote in message
news:e2**************@TK2MSFTNGP14.phx.gbl...

Okay. On closer inspection it might just be able to do what I want.

There is a method on XmlTextReader called GetRemainder that returns what is left in its buffer. If I record the current position in the underlying
stream and combine it with the buffer contents I could get somewhere.

In the mean time, any pointers welcome!

Thanks

"Oleg Tkachenko [MVP]" <oleg@NO!SPAM!PLEASEtkachenko.com> wrote in message
news:#6**************@TK2MSFTNGP15.phx.gbl...

Xerox wrote:

What I really want to be able to do is create an XmlReader that I can detach from a stream. Persist the XmlReader's state, then reattach it to the stream at a later date and have the XmlReader advance up to where it was in the stream instantly by doing a seek on the stream.

I think it should work unless you are modifying stream, why not? But
what's the point?

--
Oleg Tkachenko [XML MVP, MCP]
http://blog.tkachenko.com