System.Xml.Xsl.XsltOld.WithParamAction.Execute C# (CSharp) Method

        internal override void Execute(Processor processor, ActionFrame frame) {
            Debug.Assert(processor != null && frame != null);
            object ParamValue;
            switch(frame.State) {
            case Initialized:           
                if (this.selectKey != Compiler.InvalidQueryKey) {
                    ParamValue = processor.RunQuery(frame, this.selectKey);
                    processor.SetParameter(this.name, ParamValue);
                    frame.Finished();
                }
                else {
                    if (this.containedActions == null) {
                        processor.SetParameter(this.name, string.Empty);
                        frame.Finished();
                        break;
                    }
                    NavigatorOutput output = new NavigatorOutput(baseUri);
                    processor.PushOutput(output);
                    processor.PushActionFrame(frame);
                    frame.State = ProcessingChildren;
                }
                break;
            case ProcessingChildren:
                RecordOutput recOutput = processor.PopOutput();
                Debug.Assert(recOutput is NavigatorOutput);
                processor.SetParameter(this.name,((NavigatorOutput)recOutput).Navigator);
                frame.Finished();
                break;
            default:
                Debug.Fail("Invalid execution state inside VariableAction.Execute");
		    break;
            }
        }
    }