Lambda 表达式示例

Question

有人可以给我展示一个“传统”的计算示例，例如使用循环方法找到人们年龄的平均值，然后使用 lambda 表达式的示例

Answer 1

让我们看看

class People
{
  int Age {get;set;}
};

var people = new List<People>() {...};

方法循环

int sum = 0;
foreach(var p in people)
 sum += p.Age;
int average = sum / people.Count;

lambda

int average = people.Average(p => p.Age);

Answer 2

class Human
{
    public int Age { get; set; }
}

IEnumerable<Human> people = ...
int age = people.Average(p => p.Age);

Answer 3

var ages = new int[] { 10, 12, 14 };
var sum = 0;
var count = 0;

// loop
foreach (var age in ages) {
    count++;
    sum += age;
}
var average = sum / count;

// lambda
ages.Average(x => x); // this is where it'd be something like x.age if it was an array of objects instead of ints