Multiple SUM using LINQ

Question

I have a loop like the following, can I do the same using multiple SUM?

foreach (var detail in ArticleLedgerEntries.Where(pd => pd.LedgerEntryType == LedgerEn         


        

Answer 1

You could also group by true - 1 (which is actually including any of the items and then have them counted or summered):

 var results = from x in ArticleLedgerEntries
                       group x by 1
                       into aggregatedTable
                       select new
                                  {
                                      SumOfWeight = aggregatedTable.Sum(y => y.weight),
                                      SumOfLength = aggregatedTable.Sum(y => y.Length),
                                      SumOfNrDistaff = aggregatedTable.Sum(y => y.NrDistaff)
                                  };

As far as Running time, it is almost as good as the loop (with a constant addition).