从另一个排序列表创建过滤列表

Posted 2023-04-11

【中文标题】从另一个排序列表创建过滤列表

【英文标题】：Create a filtered list from another sorted list

【发布时间】：2022-01-02 20:39:57

【问题描述】：

我有一个 .我想根据 Id 属性对该列表进行排序，然后根据 JoinedDate 属性过滤项目。我如何在这里使用 Linq。

public class Person
    
        public int Id  get; set; 
        public string Name  get; set; 
        public DateTime JoinedDate  get; set; 

    


static void Main (string[] args)
        
            List<Person> persons = new List<Person> ();

            var date1 = new DateTime (2021, 1, 1);
            var date2 = new DateTime (2021, 2, 1);
            var date3 = new DateTime (2021, 3, 1);
            var date4 = new DateTime (2021, 4, 1);


            persons.Add(new Person Id = 1, JoinedDate = date1, Name = "John");
            persons.Add (new Person  Id = 2, JoinedDate = date2, Name = "Tim" );
            persons.Add (new Person   Id = 3, JoinedDate = date3, Name = "Karl" );
            persons.Add (new Person  Id = 4, JoinedDate = date4, Name = "Jim" );

            // I have Two dates
            // From and To
            // Need to Created a list of person whose JoinedDate is between From and To data

            List<Person> filteredPersons = new List<Person> ();



        

【问题讨论】：

persons.Where(x => x.JoinedDate > ... && x.JoinedDate < ...).OrderBy(y => y.Id)?

【参考方案1】：

var filteredPersons = persons
                        .Where(person => 
                            person.JoinedDate >= from && person.JoinedDate <= to)
                        .OrderBy(person => person.Id)
                        .ToList();

我想这就是你所需要的。

【参考方案2】：

已修复，由 @Crowcoder 建议

persons.Where(person=>person.JoinedDate > new DateTime(year,month,day) && person.JoinedDate < new DateTime(year, month, day)).OrderBy(person=>person.Id).ToList()

PS。为清楚起见，请将您的列表重命名为 people。

【讨论】：

不做“之间”比较