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Re-reading a Stream without reopening
Anyone have any idea how I can do the following? I have a connection to an XML file on a site I do not control, getting a string representation of the xml data that I can then feed to my XmlDataSource object (CurrentXMLData): Stream newStream = myWebClient.OpenRead(myStringWebResource); TextReader newReader = new StreamReader(newStream); string newData = newReader.ReadToEnd(); CurrentXMLData.Data = newData; Now, I want to use the stream above as an argument for another method
- but the stream is at the end and doesn't support seeking.
SReader SReader = new SFileReader(newStream); //
EndOfStream is true! so object never initializes.
The SFileReader object will support any inputs that ReadXml on a
dataset will support (XmlReader, TextReader, string filename and
Stream)
The TextReader and XmlReader don't support seeking either.
The only way I've found to do this is to re-open the stream and re-
read - which is very time consuming.
Any ideas on how I can re-use the data in CurrentXMLData, newData or
newStream to populate my SFileReader object?
Thanks in advance,
Ted
T Driver, You can reset the stream position with the following line of code:
newStream.Seek(0, SeekOrigin.Begin)
Hope this helps,
Steve
"T Driver" <drive @gmail.com> wrote in message ...
> Anyone have any idea how I can do the following? > I have a connection to an XML file on a site I do not control, getting > a string representation of the xml data that I can then feed to my > XmlDataSource object (CurrentXMLData): > Stream newStream = > myWebClient.OpenRead(myStringWebResource); > TextReader newReader = new StreamReader(newStream); > string newData = newReader.ReadToEnd(); > CurrentXMLData.Data = newData; > Now, I want to use the stream above as an argument for another method
> - but the stream is at the end and doesn't support seeking.
> SReader SReader = new SFileReader(newStream); //
> EndOfStream is true! so object never initializes.
> The SFileReader object will support any inputs that ReadXml on a
> dataset will support (XmlReader, TextReader, string filename and
> Stream)
> The TextReader and XmlReader don't support seeking either.
> The only way I've found to do this is to re-open the stream and re-
> read - which is very time consuming.
> Any ideas on how I can re-use the data in CurrentXMLData, newData or
> newStream to populate my SFileReader object?
> Thanks in advance,
> Ted
On Jun 5, 10:47 am, "PlatinumBay" <stevan @community.nospam> wrote: > T Driver, > You can reset the stream position with the following line of code:
> newStream.Seek(0, SeekOrigin.Begin)
> Hope this helps,
> Steve
> "T Driver" <drive@gmail.com> wrote in message
Actually, that was the first thing I tried, but for this stream (it's not coming from a file) the stream does not support seeking (CanSeek = false), so this doesn't work. -----------------------------------------------Reply-----------------------------------------------
Ok, fair enough. In that case, MSDN states: If a class derived from Stream does not support seeking, calls to Length,
SetLength, Position, and Seek throw a NotSupportedException.
You may want to use a different stream reader (such as the MemoryStream)
that supports seeking.
Hope this helps,
Steve
"T Driver" <drive @gmail.com> wrote in message ...
> On Jun 5, 10:47 am, "PlatinumBay" <stevan @community.nospam> wrote: >> T Driver, >> You can reset the stream position with the following line of code:
>> newStream.Seek(0, SeekOrigin.Begin)
>> Hope this helps,
>> Steve
>> "T Driver" <drive@gmail.com> wrote in message
> Actually, that was the first thing I tried, but for this stream (it's
> not coming from a file) the stream does not support seeking (CanSeek =
> false), so this doesn't work.
On Jun 5, 11:13 am, "PlatinumBay" <stevan @community.nospam> wrote:
> Ok, fair enough. In that case, MSDN states: > If a class derived from Stream does not support seeking, calls to Length,
> SetLength, Position, and Seek throw a NotSupportedException.
> You may want to use a different stream reader (such as the MemoryStream)
> that supports seeking.
> Hope this helps,
> Steve
> "T Driver" <drive@gmail.com> wrote in message
> news:1181063026.848778.161910@p77g2000hsh.googlegroups.com...
> > On Jun 5, 10:47 am, "PlatinumBay" <stevan@community.nospam> wrote:
> >> T Driver,
> >> You can reset the stream position with the following line of code:
> >> newStream.Seek(0, SeekOrigin.Begin)
> >> Hope this helps,
> >> Steve
> >> "T Driver" <drive@gmail.com> wrote in message
> > Actually, that was the first thing I tried, but for this stream (it's
> > not coming from a file) the stream does not support seeking (CanSeek =
> > false), so this doesn't work.
Thanks - I thought of those, but hadn't had time to implement yet. I was hoping there would be something similar to Java's StringStream class - this would be perfect here -----------------------------------------------Reply-----------------------------------------------
T, Maybe I should take a step back here, what is it that you are trying to
accomplish?
Steve
"T Driver" <drive @gmail.com> wrote in message ...
> Anyone have any idea how I can do the following? > I have a connection to an XML file on a site I do not control, getting > a string representation of the xml data that I can then feed to my > XmlDataSource object (CurrentXMLData): > Stream newStream = > myWebClient.OpenRead(myStringWebResource); > TextReader newReader = new StreamReader(newStream); > string newData = newReader.ReadToEnd(); > CurrentXMLData.Data = newData; > Now, I want to use the stream above as an argument for another method
> - but the stream is at the end and doesn't support seeking.
> SReader SReader = new SFileReader(newStream); //
> EndOfStream is true! so object never initializes.
> The SFileReader object will support any inputs that ReadXml on a
> dataset will support (XmlReader, TextReader, string filename and
> Stream)
> The TextReader and XmlReader don't support seeking either.
> The only way I've found to do this is to re-open the stream and re-
> read - which is very time consuming.
> Any ideas on how I can re-use the data in CurrentXMLData, newData or
> newStream to populate my SFileReader object?
> Thanks in advance,
> Ted
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