Cool XSD Validation Function for Orchestration

As I promised in an earlier post, here`s a cool XSD validation function that can be called from within orchestration. Just add to a library - I tend to put it into a BizTalk Utilities library full of useful little functions that complement orchestration (most of which should be provided by the orchestration engine, but that`s a rant for another day!).

public static void ValidateDocument( XmlDocument businessDocument, string schemaStrongName )
{
  // Constants
  const int PARTS_IN_SCHEMA_STRONG_NAME = 2;
  const int PART_CLASS_NAME = 0;
  const int PART_QUALIFIED_ASSEMBLY_NAME = 1;

  // Parse schema strong name
  string[] assemblyNameParts = schemaStrongName.Split( new char[] { `,` }, PARTS_IN_SCHEMA_STRONG_NAME );
  string className = assemblyNameParts[PART_CLASS_NAME].Trim();
  string fullyQualifiedAssemblyName = assemblyNameParts[PART_QUALIFIED_ASSEMBLY_NAME].Trim();

  // Load assembly
  Assembly schemaAssembly = Assembly.Load( fullyQualifiedAssemblyName );

  // Create instance of the BTS schema in order to get to the actual schemas
  Type schemaType = schemaAssembly.GetType( className );
  Microsoft.XLANGs.BaseTypes.SchemaBase btsSchemaCollection = ( Microsoft.XLANGs.BaseTypes.SchemaBase )Activator.CreateInstance( schemaType );

  // Set up XML validating reader and validate document
  XmlParserContext parserContext = new XmlParserContext( null, null, ", XmlSpace.None );
  XmlValidatingReader reader = new XmlValidatingReader( businessDocument.OuterXml, XmlNodeType.Document, parserContext );
  reader.ValidationType = ValidationType.Schema;
  reader.Schemas.Add( btsSchemaCollection.SchemaCollection );
  while( reader.Read() ) {}
}

In order to call in orchestration, just create an expression shape and use the following:

ValidateDocument( myBtsMessage, myBtsMessage( BTS.SchemaStrongName ) );