Question

我在MS Sql Server中使用这些名为sample的表：

 ID    Date    Description
1    2012/01/02 5:12:43    Desc1
2    2012/01/02 5:12:48    Desc2
3    2012/01/03 5:12:41    Desc3
4    2012/01/03 5:12:43    Desc4

现在我想编写LINQ查询，结果将是：

4    2012/01/03 5:12:43    Desc4

我写了这个，但它不起作用：

List<Sample> q = (from n in  Sample.Max(T=>T.Date)).ToList();

Answer 1

使用：

var result = Sample.OrderByDescending(t => t.Date).First();

Answer 2

要按日期获取最大Sample值，而不必排序（这不是真正必要的最大值）：

var maxSample  = Samples.Where(s => s.Date == Samples.Max(x => x.Date))
                        .FirstOrDefault();

Answer 3

List<Sample> q = Sample.OrderByDescending(T=>T.Date).Take(1).ToList();

但我认为你想要

Sample q = Sample.OrderByDescending(T=>T.Date).FirstOrDefault();

Answer 4

var lastInstDate = model.Max(i=>i.ScheduleDate);

我们可以从这个模型获得最大日期。

Answer 5

IList<Student> studentList = new List<Student>() { 
    new Student() { StudentID = 1, StudentName = "John", Age = 18 } ,
    new Student() { StudentID = 2, StudentName = "Steve",  Age = 15 } ,
    new Student() { StudentID = 3, StudentName = "Bill",  Age = 25 } ,
    new Student() { StudentID = 4, StudentName = "Ram" , Age = 20 } ,
    new Student() { StudentID = 5, StudentName = "Ron" , Age = 19 } 
};

var orderByDescendingResult = from s in studentList
                   orderby s.StudentName descending
                   select s;

结果：史蒂夫罗恩内存约翰比尔

Answer 6

var result= Sample.OrderByDescending(k => k.ID).FirstOrDefault().Date;

这是最好的方法

LINQ中的最大日期记录

6 个答案: