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

        protected override QilNode VisitTypeAssert(QilTargetType ndTypeAssert) {
            if (!ndTypeAssert.Source.XmlType.IsSingleton && !this.iterCurr.HasLabelNext) {
                // This case occurs when a non-singleton expression is treated as cardinality One.
                // The trouble is that the expression will branch to an end label when it's done iterating, so
                // an end label must be provided.  But there is no next label in the current iteration context,
                // so we've got to create a dummy label instead (IL requires it).  This creates an infinite loop,
                // but since it's known statically that the expression is cardinality One, this branch will never
                // be taken.
                Label lblDummy = this.helper.DefineLabel();
                this.helper.MarkLabel(lblDummy);
                NestedVisit(ndTypeAssert.Source, lblDummy);
            }
            else {
                // Generate code for child expression
                Visit(ndTypeAssert.Source);
            }

            this.iterCurr.EnsureItemStorageType(ndTypeAssert.Source.XmlType, GetItemStorageType(ndTypeAssert));
            return ndTypeAssert;
        }