Extensions Class

Definition

public ref class Extensions abstract sealed

public static class Extensions

type Extensions = class

Public Module Extensions

Inheritance

Object

Extensions

Examples

The XSD in Sample XSD file: Customers and orders contains a schema that can be used to validate the XML document in Sample XML file: Customers and orders. The following example loads the schema and the document, validates the document, changes the document so that the xs:key and xs:keyref relationship is not valid, and then attempts to validate again.

                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// Modify the custOrd tree so that it is no longer valid.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  

This example produces the following output:

Validating custOrd  
custOrd validated  

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

Remarks

This class also contains methods to get the post-schema-validation infoset (PSVI) of a validated XML node.

When you validate an XDocument, XElement, or XAttribute, you can also optionally populate the XML tree with the post-schema-validation infoset. PSVI information is added as an annotation of type System.Xml.Schema.XmlSchemaInfo.