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XML String

Posted on 2008-10-19
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Last Modified: 2012-05-05
Just seeing if someone has a better method out there. I am currently receiving an xml string back in my web app.  I was looking for a way to convert that xml string into something more usable that i can parse through on the fly and go through each one of the elements.

I am using vb.net

Thanks
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Question by:jimseiwert
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ozoid earned 500 total points
ID: 22754326
Hi
i use a simple xmldocument object and a select case method for each node:
You can then read the attributes and innertext from each node and it doesn't matter what order they are in in the xml file.


Function ReadXMLFile(xmlIn as string) as string     
            Dim xd As New XmlDocument()
            Dim outstr As String = ""
            xd.Load(xmlIn)
            Dim xnl As XmlNodeList
            Dim xrn As XmlNode
            xrn = xd.DocumentElement ' root node
            If xrn.HasChildNodes Then
                xnl = xrn.ChildNodes
                For l As Integer = 0 To  xnl.Count - 1
                  Select Case xnl.Name
                    Case "node1"
                      outstr &= xrn.InnerText
                    Case "node2"
                      outstr &= xrn.innerText
                  End Select
                Next
            End if
Return outstr
End Function

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by:jimseiwert
ID: 22754367
Is there a way to do this without passing a file? I am trying to avoid creating a file just to read it and then delete it. I have the xml string already in memory?

Also can you provide an example of how you read your above example.

Thanks,
Jim
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by:jimseiwert
ID: 22754375
I dont need the example, I understand your method. Thanks,

If you can think of a way i can do this without loading a file.
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Assisted Solution

by:ozoid
ozoid earned 500 total points
ID: 22754416
Hi

Use
xd.LoadXml(xmlIn) where xmlIn is a string from memory
or
xd.Load(xmlIn) to load from a file where xmlin is the filename

The code goes something like this:
Create a new empty XMLDocument obkect = xd
Create an empty string for output = outstr
load the string/file into the document object (must be valid XML)
create an empty list for the nodes to go in
create a node object to store the infomation
open the root element (xml files should always have a root element)
if the root element has child elements then go through each one
If the node name = "node1" then append to the output variable outstr the value contained in the xml node
If the node name = "node2" then do the same..
    <rootnode>
      <node1 colour="yellow" >bananas</node1>
      <node1 colour="green" >apples</node1>
      <node2 shape="oblong" >box</node2>
</rootnode>

output: bananasboxapples

not the greatest example i admit - but i hope you get the idea..
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by:jimseiwert
ID: 22754469
I am getting the following message when it gets to the .load - Illegal characters in path.  , any thoughts ?

 I tried to pass it a file and a xml string
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Expert Comment

by:ozoid
ID: 22754495
Have you got a properly formatted xml document
you may need to add
<?xml version="1.0" encoding="utf-8"?>
to the beginning of the string to ensure the XMLDocument object knows whats happening..

the LoadXml function should take a string - exactly what would be the contents of the file..

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by:jimseiwert
ID: 22754586
Hey i was able to read the xml, it was my error. I did not change it to loadxml.

Any idea using your method how to read subtags?
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Expert Comment

by:ozoid
ID: 22756023
Hi
To read child tags - check the node hasChildNodes then use another for next loop and more select case statements.

     If xrn.HasChildNodes Then
                xnl = xrn.ChildNodes
                For l As Integer = 0 To  xnl.Count - 1
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