var instance = new GcSpread.Sheets.SlicerStyleInfo(backColor,
                                                  foreColor,
                                                  font,
                                                  borderLeft,
                                                  borderTop,
                                                  borderRight,
                                                  borderBottom,
                                                  textDecoration);
var returnValue; // Type: TextDecorationType
returnValue = instance.textDecoration(value);