Validating xml data with xmlreader
Page Protected Sub Page_Load(By Val sender As Object, By Val e As System.
Validation Event Handler, _ Address Of settings_Validation Event Handler settings. Ignore Comments = True Dim books File As String = Path.
Using the Xml Document class, you can validate the XML content contained in an Xml Document object in two ways. If a Validation Event Handler is set on the validating Xml Reader, the Validation Event Handler will get called whenever an invalid type is encountered. Message) Exit Sub End Select End Sub End Class After modifications are made to an XML document, you can validate the modifications against the schema for the XML document using the Validate method of the Xml Document class. XPath Class Validating Reader Example Shared Sub Main(By Val args() As String) Try Dim settings As Xml Reader Settings = New Xml Reader Settings() settings.
The first way is to validate the XML content using a validating Xml Reader object and the second way is to use the Validate method of the Xml Document class. An Xml Schema Exception will be thrown when an attribute or element with Typed Value set to is accessed by the XPath Navigator. The following example validates the file as it is loaded into the Xml Document object by creating the Xml Document object using a validating Xml Reader object.
You'd normally need to supply a Resolver (google Entity Resolver) which tells the parser where to find the externally referenced documents.
Yes, you could let the resolver take the location info directly from the namespace URI (but this is not recommended; I think I remember some XBRL taxonomies use this approach IIRC).
It can validate an XML document as it reads and parses the document.
In this example, we demonstrate how to activate such validation.
I have kept the xsd file in the same dir as of the xml file.
There may or may not be default Entity Resolver implementations that do simple things (like: look in a single directory or download from the URI as a http url), but in my experience I always had to code an Entity Resolve one way or another.
It is not a lot of work anyway Just a word of advice.
This program validates the XML document against the schema successfully.
However, when the user selects the XML document catalog1.xml, validation fails for the book element in the lines containing more than one title element.
Again set the Xml Reader Settings object's Schemas property to schemas.