private static SWATHIndexerItem CreateItem(MassSpectrum ms) { if (ms.BeginParamEdit().Get_MS_Level().GetInt32() != 2) { return(null); } if (ms.Precursors.Count < 1 || ms.Precursors[0].SelectedIons.Count < 1 || ms.Scans.Count < 1) { return(null); } IValueConverter rt = ms.Scans[0].BeginParamEdit().Get_MS_ScanStartTime(); IParamEdit isoWin = ms.Precursors[0].IsolationWindow.BeginParamEdit(); IValueConverter mz = isoWin.Get_MS_IsolationWindowTargetMz(); IValueConverter mzLow = isoWin.Get_MS_IsolationWindowLowerOffset(); IValueConverter mzHigh = isoWin.Get_MS_IsolationWindowUpperOffset(); if (rt.HasValue() && mz.HasValue() && mzLow.HasValue() && mzHigh.HasValue()) { double mzValue = mz.GetDouble(); return(new SWATHIndexerItem() { Mz = mz.GetDouble(), MzStart = SaveSubtract(mzValue, mzLow.GetDouble()), MzEnd = SaveAdd(mzValue, mzHigh.GetDouble()), Rt = rt.GetDouble(), SpectrumID = ms.ID }); } else { return(null); } }