Question

I’m trying to validate some XML against a schema and gather as much information as possible to provide valuable error messages to the user.

I’ve managed to validate a serialized object against an XSD. My ValidationEventHandler is being called properly for all errors and I get get some information there. The only problem is that schema information is not available at this point – I’m trying to get to the schema type of the element. i.e. given the following schema element, I would like to get “BookType”

<element minOccurs="0" maxOccurs="1" name="TypeOfBook" type="myTypes:BookType" />

I believe schema/validation information is being inserted into the xml during the validation process. So if I call validate twice in a row, only handling the erros the second time around, the schema information is available.

serializedObject.Validate((x, y) => { });
serializedObject.Validate((x, y) => { // handle errors here because elements will have schema info available });

Obviously, this solution leaves much to be desired. What is the recommended way of dealing with this?

Answer 1

I found a solution.

Every time the ValidationEventHandler gets called, add the XmlSchemaValidationException.SourceObject Xmlelement to a list. Once validation is complete the schema information would be added to these objects, enabling me to access the information. i.e. Element.SchemaInfo.SchemaType.Name.

An XmlSchemaValidationException gets passed to the event handler with a property “SourceObject ” which is an XmlElement.

            List<XmlElement> errorElements = new List<XmlElement>();

            serializedObject.Validate((x, y) =>
            {
                var exception = (y.Exception as XmlSchemaValidationException);

                if (exception != null)
                {
                    var element = (exception.SourceObject as XmlElement);

                    if (element != null)
                        errorElements.Add(new XmlValidationError(element));
                }

            });