C# List中写出类似SQL的语句

作者：袖梨 2022-06-25

从一个关系表中挑出一个我们需要的元素列表采用SQL语句是再容易不过的了，其实C#的List中也可以采用类似的方法，虽然List中集成了Select(), Where()等语句，不过如果你的判断规则较为复杂，或者想要看起来一目了然，以下的方法也是可行的：

首先假设你有一个类

 代码如下 复制代码

public class People
{
    public string Name { get; set; }
    public int Age { get; set; }
}并且有一些初始化语句List PeopleList = new List();
PeopleList.Add(new People() { Name = "Haocheng Wu", Age = 24 });
PeopleList.Add(new People() { Name = "Haocheng Wu", Age = 25 });
PeopleList.Add(new People() { Name = "James Wu", Age = 23 });你就可以采用下面类似于SQL语句的方法进行select

List SubPeopleNameList1 = (from people in PeopleList
                              where people.Name == "Haocheng Wu" && people.Age == 24
                              select people.Name).ToList();

当然你也可以用一行代替
 

 代码如下 复制代码
List SubPeopleNameList2 = PeopleList.Where(people => people.Name == "Haocheng Wu" && people.Age == 24).Select(people => people.Name).ToList();

不过显然第一种方法更加一目了然，尤其是当判断条件相当复杂的时候就更加有用了

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