System.Xml.Xsl.IlGen.XmlILVisitor.VisitSortKey C# (CSharp) Method

        private void VisitSortKey(QilSortKey ndKey, LocalBuilder locKeys) {
            Label lblOnEndKey;
            Debug.Assert(ndKey.Key.XmlType.IsAtomicValue, "Sort key must be an atomic value.");

            // Push collation onto the stack
            this.helper.Emit(OpCodes.Ldloca, locKeys);
            if (ndKey.Collation.NodeType == QilNodeType.LiteralString) {
                // collation = runtime.GetCollation(idx);
                this.helper.CallGetCollation(this.helper.StaticData.DeclareCollation((string) (QilLiteral) ndKey.Collation));
            }
            else {
                // collation = runtime.CreateCollation(str);
                this.helper.LoadQueryRuntime();
                NestedVisitEnsureStack(ndKey.Collation);
                this.helper.Call(XmlILMethods.CreateCollation);
            }

            if (ndKey.XmlType.IsSingleton) {
                NestedVisitEnsureStack(ndKey.Key);

                // keys.AddSortKey(collation, value);
                this.helper.AddSortKey(ndKey.Key.XmlType);
            }
            else {
                lblOnEndKey = this.helper.DefineLabel();
                StartNestedIterator(ndKey.Key, lblOnEndKey);
                Visit(ndKey.Key);
                this.iterCurr.EnsureStackNoCache();
                this.iterCurr.EnsureItemStorageType(ndKey.Key.XmlType, GetItemStorageType(ndKey.Key));

                // Non-empty sort key
                // keys.AddSortKey(collation, value);
                this.helper.AddSortKey(ndKey.Key.XmlType);

                // goto LabelDone;
                // LabelOnEnd:
                Label lblDone = this.helper.DefineLabel();
                this.helper.EmitUnconditionalBranch(OpCodes.Br_S, lblDone);
                this.helper.MarkLabel(lblOnEndKey);

                // Empty sequence key
                // keys.AddSortKey(collation);
                this.helper.AddSortKey(null);

                this.helper.MarkLabel(lblDone);

                EndNestedIterator(ndKey.Key);
            }
        }