Hi all, I am trying to validate an xml document which has been created in the dom. Once it has been saved it will validate fine but I need my application to work without any files being physically saved.
Below is a example of what I am trying to do:
SCHEMA:
< xml version="1.0" encoding="utf-8" >
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="urn:Schema" targetNamespace="urn:Schema" elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:element name="root">
<xs:complexType>
<xs:sequence>
<xs:element name="element">
<xs:complexType>
<xs:sequence>
<xs:element name="subElementOne" type="xs:string"/>
<xs:element name="subElementTwo" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
CODE:
Imports System
Imports System.Xml
Imports System.Xml.Schema
Module Module1
Sub Main()
'DONT WORK!
'-----------------------------------------------------------------------
Dim xmlDoc As New XmlDocument
Dim element As XmlElement
Dim elementChild As XmlElement
Dim node As XmlNode
element = xmlDoc.CreateElement("root")
node = xmlDoc.AppendChild(element)
xmlDoc.DocumentElement.SetAttribute("xmlns", "urn:Schema")
element = xmlDoc.CreateElement("element")
node = xmlDoc.DocumentElement.AppendChild(element)
elementChild = xmlDoc.CreateElement("subElementOne")
node = element.AppendChild(elementChild)
Dim settings As XmlReaderSettings = New XmlReaderSettings()
settings.Schemas.Add("urn:Schema", "xsdDoc.xsd")
settings.ValidationType = ValidationType.Schema
AddHandler settings.ValidationEventHandler, New ValidationEventHandler(AddressOf settingsValidationEventHandler)
Dim nodeReader As New XmlNodeReader(xmlDoc)
Dim reader As XmlReader = XmlReader.Create(nodeReader, settings)
While reader.Read()
End While
'-----------------------------------------------------------------------
Console.Clear()
'WORKS!
'-----------------------------------------------------------------------
xmlDoc.Save("xmlDoc.xml")
reader = XmlReader.Create("xmlDoc.xml", settings)
While reader.Read()
End While
'-----------------------------------------------------------------------
End Sub
Sub settingsValidationEventHandler(ByVal sender As Object, ByVal e As ValidationEventArgs)
If e.Severity = XmlSeverityType.Warning Then
Console.Write("WARNING: ")
Console.WriteLine(e.Message)
ElseIf e.Severity = XmlSeverityType.Error Then
Console.Write("ERROR: ")
Console.WriteLine(e.Message)
End If
End Sub
End Module
Think Im nearly there but just cant get this last bit cheers, bailey.
Validating xml with xsd problem.
nicromi
If you want to create an element in a certain namespace then use a namespace aware overload of CreateElement e.g. use
element = xmlDoc.CreateElement("root", "urn:Schema")
and
element = xmlDoc.CreateElement("element", "urn:Schema")
and
elementChild = xmlDoc.CreateElement("subElementOne", "urn:Schema")
The namespace of an element or attribute node is determined when the node is being created, not later by trying to add xmlns attributes or inserting an element.
Andrew Stanford
With .NET 2.0 you have a method named Validate on XmlDocument that you can use to validate the in memory DOM document without needing to save/serialize the document.
Mile Petrov
Hi Martin, I have came across that today and have had no luck with it or finding an example which uses it in this context I have been trying this to no avail any pointers on where im going wrong
Imports System.Xml
Imports System.Xml.Schema
Module Module1
Sub Main()
Dim xmlDoc As New XmlDocument
Dim element As XmlElement
Dim elementChild As XmlElement
Dim node As XmlNode
element = xmlDoc.CreateElement("root")
node = xmlDoc.AppendChild(element)
xmlDoc.Schemas.Add("urn:Schema", "xsdDoc.xsd")
xmlDoc.DocumentElement.SetAttribute("xmlns", "urn:Schema")
element = xmlDoc.CreateElement("element")
node = xmlDoc.DocumentElement.AppendChild(element)
elementChild = xmlDoc.CreateElement("subElementOne")
node = element.AppendChild(elementChild)
Dim eventHandler As ValidationEventHandler = New ValidationEventHandler(AddressOf ValidationEventHandler)
xmlDoc.Validate(eventHandler)
Stop
End Sub
Sub ValidationEventHandler(ByVal sender As Object, ByVal e As ValidationEventArgs)
Select Case e.Severity
Case XmlSeverityType.Error
Console.WriteLine("Error: {0}", e.Message)
Case XmlSeverityType.Warning
Console.WriteLine("Warning {0}", e.Message)
End Select
End Sub
End Module
Wilk06
Tom Frey
Hi martin thanks alot that has got it going now, however I am curious to know how you would add a schema to an xml document passed to a function from an external source.
Say you are sent an xml document which has no namespaces etc and you have an xsd that you want to validate it against. Would you have to interop using strings and then validate through the XmlReader or is there a way to add the namespace in afterwards and still use xmlDocument.Validate