System.Xml.Xsl.XsltOld.XsltCompileContext.FuncKey.Invoke C# (CSharp) Method

            public override object Invoke(XsltContext xsltContext, object[] args, XPathNavigator docContext) {
                XsltCompileContext xsltCompileContext = (XsltCompileContext) xsltContext;

                string local, prefix;
                PrefixQName.ParseQualifiedName(ToString(args[0]), out prefix, out local);
                string ns = xsltContext.LookupNamespace(prefix);
                XmlQualifiedName keyName = new XmlQualifiedName(local, ns);

                XPathNavigator root = docContext.Clone();
                root.MoveToRoot();

                ArrayList resultCollection = null;

                foreach (Key key in xsltCompileContext.processor.KeyList) {
                    if (key.Name == keyName) {
                        Hashtable keyTable = key.GetKeys(root);
                        if (keyTable == null) {
                            keyTable = xsltCompileContext.BuildKeyTable(key, root);
                            key.AddKey(root, keyTable);
                        }

                        XPathNodeIterator it = args[1] as XPathNodeIterator;
                        if (it != null) {
                            it = it.Clone();
                            while (it.MoveNext()) {
                                resultCollection = AddToList(resultCollection, (ArrayList) keyTable[it.Current.Value]);
                            }
                        } else {
                            resultCollection = AddToList(resultCollection, (ArrayList) keyTable[ToString(args[1])]);
                        }
                    }
                }
                if (resultCollection == null) {
                    return XPathEmptyIterator.Instance;
                } else if (resultCollection[0] is XPathNavigator) {
                    return new XPathArrayIterator(resultCollection);
                } else {
                    return new XPathMultyIterator(resultCollection);
                }
            }