Extensions Class (System.Xml.Schema)

<ExtensionAttribute> _
Public NotInheritable Class Extensions

public static class Extensions

[ExtensionAttribute]
public ref class Extensions abstract sealed

[<AbstractClass>]
[<Sealed>]
type Extensions =  class end

XmlSchemaSet schemas = new XmlSchemaSet();
schemas.Add("", "CustomersOrders.xsd");

XDocument custOrd = XDocument.Load("CustomersOrders.xml");

Console.WriteLine("Validating custOrd");
bool errors = false;
custOrd.Validate(schemas, (o, e) =>
                     {
                         Console.WriteLine("{0}", e.Message);
                         errors = true;
                     });
Console.WriteLine("custOrd {0}", errors ? "did not validate" : "validated");

// Modify the custOrd tree so that it is no longer valid.
custOrd.Root.Element("Orders").Element("Order").Element("CustomerID").Value = "AAAAA";

Console.WriteLine();
Console.WriteLine("Validating custOrd");
errors = false;
custOrd.Validate(schemas, (o, e) =>
                     {
                         Console.WriteLine("{0}", e.Message);
                         errors = true;
                     });
Console.WriteLine("custOrd {0}", errors ? "did not validate" : "validated");

Dim errors As Boolean = False

Private Sub XSDErrors(ByVal o As Object, ByVal e As ValidationEventArgs)
    Console.WriteLine("{0}", e.Message)
    errors = True
End Sub

Sub Main()
    Dim schemas As XmlSchemaSet = New XmlSchemaSet()
    schemas.Add("", "CustomersOrders.xsd")

    Console.WriteLine("Validating custOrd")
    Dim custOrd As XDocument = XDocument.Load("CustomersOrders.xml")
    errors = False
    custOrd.Validate(schemas, AddressOf XSDErrors)
    Console.WriteLine("custOrd {0}", IIf(errors, "did not validate", "validated"))

    Console.WriteLine()
    Console.WriteLine("Validating custOrd")
    ' Modify the source document so that it will not validate.
    custOrd.Root.Element("Orders").Element("Order").Element("CustomerID").Value = "AAAAA"
    errors = False
    custOrd.Validate(schemas, AddressOf XSDErrors)
    Console.WriteLine("custOrd {0}", IIf(errors, "did not validate", "validated"))
End Sub

Validating custOrd
custOrd validated

Validating custOrd
The key sequence 'AAAAA' in Keyref fails to refer to some key.
custOrd did not validate