Lambda表達式示例

Question

有人能給我看一個「傳統」計算示例，例如：發現人民歲的平均水平，使用循環的方法，然後一個例子使用lambda表達式

Answer 1

讓我們來看看

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

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

方法循環

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

拉姆達

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