在foreach循环中聚合

List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
int sum = numbers.Sum();
double average = numbers.Average();
int count = numbers.Count;

List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
int sum = numbers.Sum();
double average = numbers.Average();
int count = numbers.Count;

List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
int sum = 0;
for (int i = 0; i < numbers.Count; i++)
{
    sum += numbers[i];
}
double average = sum / numbers.Count;