I am interested in defining a key constraint in my Xsd. It is my understanding that using xs:key should constrain the value used to a member of a referenced list of values.<
As usual, after a good night's rest and a fresh look, spotted no fewer than 2 errors in this exercise.
XmlSchemaValidationFlags.ProcessIdentityConstraints
set by XmlReaderSettings.ValidationFlag
, and<xs:selector xpath="part"/>
should read <xs:selector xpath="r:part"/>
.Full working sample is as follows,
<xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="namespace1"
xmlns:r="namespace1"
elementFormDefault="qualified">
<xs:element name="root">
<xs:complexType>
<xs:sequence>
<xs:element name="A" type="r:A" maxOccurs="unbounded">
<xs:keyref name="dummy" refer="r:pNumKey">
<!-- without 'r:' below, key was not recognized, boo-urns msdn! -->
<xs:selector xpath="r:part"/>
<xs:field xpath="@ref-number"/>
</xs:keyref>
</xs:element>
<xs:element name="B" type="r:B"/>
</xs:sequence>
</xs:complexType>
<xs:key name="pNumKey">
<xs:selector xpath="r:B/r:part"/>
<xs:field xpath="@key-number"/>
</xs:key>
</xs:element>
<xs:complexType name="A">
<xs:sequence>
<xs:element name="part" maxOccurs="unbounded">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="ref-number" type="xs:integer"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="B">
<xs:sequence>
<xs:element name="part" maxOccurs="unbounded">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="key-number" type="xs:integer"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:schema>
Xml sample
<root xmlns="namespace1">
<A>
<!-- goes CRASH BOOM bang! failure for the win! -->
<part ref-number="5"/>
</A>
<B>
<part key-number="1"/>
<part key-number="2"/>
<part key-number="3"/>
</B>
</root>
simple validator
[TestMethod]
public void Test_Schema()
{
string schemaFileName = @"sampleSchema.xsd";
string xmlFileName = @"sampleXml.xml";
XmlSchema schema =
XmlSchema.Read(
File.OpenText(schemaFileName),
(o, e) => { throw new Exception("BOOM"); });
XmlReaderSettings settings = new XmlReaderSettings
{
ValidationType = ValidationType.Schema,
ValidationFlags =
XmlSchemaValidationFlags.ProcessInlineSchema |
XmlSchemaValidationFlags.ProcessSchemaLocation |
XmlSchemaValidationFlags.ReportValidationWarnings |
// d'oh! explicit flag for processing identity constraints!
XmlSchemaValidationFlags.ProcessIdentityConstraints,
};
settings.Schemas.Add(schema);
settings.ValidationEventHandler +=
(o, e) => { throw new Exception("CRASH"); };
XmlReader reader = XmlReader.Create(xmlFileName, settings);
while (reader.Read()) { }
}
I guess you should use ValidationEventHandler :
settings.ValidationEventHandler += new ValidationEventHandler (ValidationCallBack);
private static void ValidationCallBack (object sender, ValidationEventArgs args) {}