Calculate difference from previous item with LINQ

Question

I\'m trying to prepare data for a graph using LINQ.

The problem that i cant solve is how to calculate the \"difference to previous.

the result I expect is <

Answer 1

In C#4 you can use the Zip method in order to process two items at a time. Like this:

        var list1 = list.Take(list.Count() - 1);
        var list2 = list.Skip(1);
        var diff = list1.Zip(list2, (item1, item2) => ...);