关于c＃：使用LINQ从列表中获取第一个和第二个对象


Get the first and second objects from a list using LINQ

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我有一份Person物品清单。我如何才能从使用LINQ的List People中获得满足特定标准的第一和第二个Person对象？

假设这是我的清单。我怎样才能找到18岁以上的第一和第二个人，那就是詹姆斯和乔迪。

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public class Person
{
    public string Name;
    public int age;
}

var People = new List<Person>
{
   new Person {Name ="Jack", Age = 15},
   new Person {Name ="James" , Age = 19},
   new Person {Name ="John" , Age = 14},
   new Person {Name ="Jodie" , Age = 21},
   new Person {Name ="Jessie" , Age = 19}
}
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var topTwo = People.Where(a => a.Age > 18).Take(2).ToArray();

Person p1, p2;
if (topTwo.Any())
{
   p1 = topTwo[0];
   if (topTwo.Count > 1)
       p2 = topTwo[1];
}
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您可以在这里使用'take()'函数。

在您的情况下，以下代码将获得前2个元素：

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public class Person
{
    public string Name;
    public int age;
}

var People = new List<Person>
{
    new Person {Name ="Jack", Age = 15},
    new Person {Name ="James" , Age = 19},
    new Person {Name ="John" , Age = 14},
    new Person {Name ="Jodie" , Age = 21},
    new Person {Name ="Jessie" , Age = 19}
}

People.Take(2);

以下代码将为您提供年龄为18岁的前2个元素：

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public class Person
{
    public string Name;
    public int age;
}

var People = new List<Person>
{
    new Person {Name ="Jack", Age = 15},
    new Person {Name ="James" , Age = 19},
    new Person {Name ="John" , Age = 14},
    new Person {Name ="Jodie" , Age = 21},
    new Person {Name ="Jessie" , Age = 19}
}

People.Where(x => x.Age > 18).Take(2);

。

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var firstTwo = People.Where(a => a.Age > 18).Take(2);

号

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