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How to parse XML address verification response from USPS in VB.NET?

Posted on 2010-11-09
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Last Modified: 2012-06-21
I have successfully sent and received an address validation request to and from USPS.  The response comes back as an XML string, as it should.

Is there some code, wrapper, module, etc. out there that will parse the response elements so that I can easily retrieve street, city, state, zip, etc.?
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Question by:mdreed
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6 Comments
 

Author Comment

by:mdreed
ID: 34102952
The examples, although staightforward, seem to require an XML file path.  I already have the USPS XML string (file contents) in a variable.  How can I use the examples with my variable contents instead of a file path?
Thanks.
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Expert Comment

by:sweetfa2
ID: 34185887
http://msdn.microsoft.com/en-us/library/1af7xa52.aspx

XMLTextReader can take a file as input, or a STRING.
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Author Comment

by:mdreed
ID: 34190652
I have read the link you provided, but it appears to me that XMLTextReader expects a file name (file path) and not a string variable.

What I have been working with is the following, but I need to parse the XML contents of a string variable instead of an XML file ("H:\Sample.xml").

Dim xDoc As XmlDocument = New XmlDocument()
xDoc.Load("H:\Sample.xml")
Dim Address1 As XmlNodeList = xDoc.GetElementsByTagName("Address1")
Dim Address2 As XmlNodeList = xDoc.GetElementsByTagName("Address2")
Dim City1 As XmlNodeList = xDoc.GetElementsByTagName("City")
Dim ST1 As XmlNodeList = xDoc.GetElementsByTagName("State")
Dim Zip1 As XmlNodeList = xDoc.GetElementsByTagName("Zip5")
Dim Zip2 As XmlNodeList = xDoc.GetElementsByTagName("Zip4")
MessageBox.Show(Address2(0).InnerText & Constants.vbLf & _
                        City1(0).InnerText & ", " & ST1(0).InnerText & " " & _                       Zip1(0).InnerText & "-" & Zip2(0).InnerText)

This code works great, but it won't handle a string variable instead of a file name.  I can change it to use the XMLTextReader, but I don't see how it would work either.  Can you provide and example of how to do as I have done above but with XMLTextReader.
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LVL 17

Accepted Solution

by:
sweetfa2 earned 500 total points
ID: 34191293
XmlTextReader reader = new XmlTextReader(new StringReader(xmlData));
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Author Closing Comment

by:mdreed
ID: 34196688
Works very well with the code I am using to extract the nodes.  Thanks.
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