Total sum for an object property value in a list using a lambda function [duplicate]

Question

I have the following: List<OutputRow> which contains a number of OutputRow objects.

I am wondering if there is a way for me to use a lambda function on the list to return the total sum of the values of a certain propertyX on each OutputRow object in the list.

Example list:

OutputRow.propertyX = 4  
OutputRow.propertyX = 6  
OutputRow.propertyX = 5  

return 15

Answer 1

Test data

var ls=new List<OutputRow>();
ls.Add(new OutputRow(){propertyX=4});
ls.Add(new OutputRow(){propertyX=6});
ls.Add(new OutputRow(){propertyX=5});

Lambda

var total= ls.Sum(x=>x.propertyX);