Question

I have a class:

class Cars 
{
   String Part;
   int NrOfParts;
}

and a List<Cars>.

I would like to get the sum of NrOfParts for a specific Part using lambda expressions.

I would like something like this:

 double sum = sil.Sum(item => item.NrOfParts WHERE item.Part == SomePart);

where sil is my list and SomePart is specific part I’m looking for.

The problem is that I don’t know how to add a where condition to restrict the search for a specific case.

Answer 1

You need to put the where clause first (using the where method), and then you sum over the filtered list.

double sum = sil.Where(i => i.Part == SomePart).Sum(i => i.NrOfParts);