Aggregate Function

Question

hi to all what is aggregate function in c# List .How to use it can you please any one give some examples on this aggregate function

Nilanka Dharmadasa · Answer

Hi Srinivas, Here is a small exmple which explains about aggregate function for list. List numlist = new List (); numlist.Add(1); numlist.Add(2); numlist.Add(3); numlist.Add(4); int mySum = numlist.Aggregate(1, (s, n) => s + n); int myProduct = numlist.Aggregate((s, n) => s * n); int myDifference = numlist.Aggregate((s, n) => s - n); Console.WriteLine("Sum is: " + mySum.ToString()); Console.WriteLine("Difference is: " + myDifference.ToString()); Console.WriteLine("Product is: " + myProduct.ToString()); If you add this to a project and run, you will get following result. Sum is: 11 Difference is: -8 Product is: 24 For aggregate method, the first parameter (optional parameter) is the seed. It means the initial value of the accumulator. int mySum = numlist.Aggregate(1, (s, n) => s + n); That's why this returned 11 instead of 10. Second parameter is the function used. Here, the function is given as a lambda expression. Lambda expression is somthing like this, (input parameters) => expression If you find my answer helpful, please tick ' Do you like this answer ' checkbox.

srinivas · Answer

thank you very much your example is very nice and I totaly understood about aggregate function

Aggregate Function

Answers (2)