Difference between Sum and Aggregate in LINQ

Question

What is the diffrence between the two functions: Sum / Aggregate?

Answer 1

Sum method in Linq Operates only on numerical data type (int,float etc) where as Aggregate method can be operated on numerical data type as well as string data type.

string[] countries = { "Brazil", "Argentina", "England", "Spain"};
string result = countries.Aggregate((a, b) => a + ", " + b);
//result="Brazil,Argentina,England"

int[] Numbers = { 2, 3, 4 };
int aggregate= Numbers.Aggregate((a, b) => a * b);
//aggregate=24