System.Xml.DocumentSchemaValidator.FindSchemaInfo C# (CSharp) Méthode

        private XmlSchemaObject FindSchemaInfo(XmlElement elementToValidate)
        {
            _isPartialTreeValid = true;
            Debug.Assert(elementToValidate.ParentNode.NodeType != XmlNodeType.Document); //Handle if it is the documentElement seperately            

            //Create nodelist to navigate down again
            XmlNode currentNode = elementToValidate;
            IXmlSchemaInfo parentSchemaInfo = null;
            int nodeIndex = 0;

            //Check common case of parent node first
            XmlNode parentNode = currentNode.ParentNode;
            do
            {
                parentSchemaInfo = parentNode.SchemaInfo;
                if (parentSchemaInfo.SchemaElement != null || parentSchemaInfo.SchemaType != null)
                {
                    break; //Found ancestor with schemaInfo
                }
                CheckNodeSequenceCapacity(nodeIndex);
                _nodeSequenceToValidate[nodeIndex++] = parentNode;
                parentNode = parentNode.ParentNode;
            } while (parentNode != null);

            if (parentNode == null)
            { //Did not find any type info all the way to the root, currentNode is Document || DocumentFragment
                nodeIndex = nodeIndex - 1; //Subtract the one for document and set the node to null
                _nodeSequenceToValidate[nodeIndex] = null;
                return GetTypeFromAncestors(elementToValidate, null, nodeIndex);
            }
            else
            {
                //Start validating down from the parent or ancestor that has schema info and shallow validate all previous siblings
                //to correctly ascertain particle for current node
                CheckNodeSequenceCapacity(nodeIndex);
                _nodeSequenceToValidate[nodeIndex++] = parentNode;
                XmlSchemaObject ancestorSchemaObject = parentSchemaInfo.SchemaElement;
                if (ancestorSchemaObject == null)
                {
                    ancestorSchemaObject = parentSchemaInfo.SchemaType;
                }
                return GetTypeFromAncestors(elementToValidate, ancestorSchemaObject, nodeIndex);
            }
        }