c# – LINQ选择与列表不同？

我有以下列表：

class Person
    {
        public String Name { get; set; }
        public String LastName { get; set; }
        public String City { get; set; }

        public Person(String name,String lastName,String city)
        {
            Name = name;
            LastName = lastName;
            City = city;
        }
    }

    ...

    personList.Add(new Person("a","b","1"));
    personList.Add(new Person("c","d","1"));
    personList.Add(new Person("e","f","2"));
    personList.Add(new Person("g","h","1"));
    personList.Add(new Person("i","j","2"));
    personList.Add(new Person("k","l","1"));

如何检索与城市名称不同的人员列表？

期待结果：

不同于城市名称的数组/列表(人员)集合：

result[0] = List<Person> where city name = "1"
result[1] = List<Person> where city name = "2"
result[n] = List<Person> where city name = "whatever"

解决方法

您可以使用LINQ按城市对人员列表进行分组：

var groupedPersons = personList.GroupBy(x => x.City);
foreach (var g in groupedPersons)
{
    string city = g.Key;
    Console.WriteLine(city);
    foreach (var person in g)
    {
        Console.WriteLine("{0} {1}",person.Name,person.LastName);
    }
}

原文地址：https://www.jb51.cc/csharp/96871.html