Question

我有以下对象结构 -

public class Student
{
        public int RollNumber { get; set; }
        public string Name { get; set; }
        public string Division { get; set; }
}

另外我有2个对象列表如下：
1）主列表 -

var masterList = new List<Student>
{
                new Student {RollNumber = 1, Name = "Jim", Division = "A"},
                new Student {RollNumber = 10, Name = "Mike", Division = "A"},
                new Student {RollNumber = 8, Name = "Peter", Division = "A"},
                new Student {RollNumber = 4, Name = "Sandy", Division = "A"},
                new Student {RollNumber = 7, Name = "Michale", Division = "A"}
};

2）SubList

var subList = new List<Student>
            {
                new Student {RollNumber = 4, Name = "Sandy", Division = "A"},
                new Student {RollNumber = 7, Name = "Michale", Division = "A"},
                new Student {RollNumber = 1, Name = "Jim", Division = "A"},
                new Student {RollNumber = 10, Name = "Mike", Division = "A"}
            };

我想在我的子列表中对主列表中的对象顺序进行排序，就像应用排序后，SubList中的对象顺序应为 -

new Student {RollNumber = 1, Name = "Jim", Division = "A"},
new Student {RollNumber = 10, Name = "Mike", Division = "A"},
new Student {RollNumber = 4, Name = "Sandy", Division = "A"},
new Student {RollNumber = 7, Name = "Michale", Division = "A"}

是否有可能实现这样的排序逻辑？

Answer 1

假设RollNumber是识别字段：

<form method="POST" action="">
    <?php
        xxx1();
        xxx2();
    ?>
</form>

Answer 2

//假设没有重复的记录。

        var masterList = new List<Student>
                            {
                                new Student {RollNumber = 1, Name = "Jim", Division = "A"},
                                new Student {RollNumber = 10, Name = "Mike", Division = "A"},
                                new Student {RollNumber = 8, Name = "Peter", Division = "A"},
                                new Student {RollNumber = 4, Name = "Sandy", Division = "A"},
                                new Student {RollNumber = 7, Name = "Michale", Division = "A"}
                            };

        var subList = new List<Student>
                            {
                                new Student {RollNumber = 4, Name = "Sandy", Division = "A"},
                                new Student {RollNumber = 7, Name = "Michale", Division = "A"},
                                new Student {RollNumber = 1, Name = "Jim", Division = "A"},
                                new Student {RollNumber = 10, Name = "Mike", Division = "A"}
                            };


        List<Student> sortedList = new List<Student>();

        foreach (var item in masterList.Select(x => x.RollNumber))
        {
            if (subList.Where(x => x.RollNumber == item).FirstOrDefault() != null)
                sortedList.Add(subList.Where(x => x.RollNumber == item).First());
        }

Answer 3

当然有可能，但你应该问自己什么是学生。因为列表当前不包含与对象标识相同的学生。

如果是，即如果masterList和subList确实包含相同的对象，您只需按顺序排序

subList.Sort((s1, s2) => masterList.IndexOf(s1).CompareTo(masterList.IndexOf(s2));

否则你必须识别学生，例如使用RollNumber。

编辑：与kaarel的答案相比，这个解决方案会对列表进行排序，而kaarel的解决方案可能更容易阅读。

如何根据C＃中另一个列表/主列表中的对象列表对对象列表进行排序？

3 个答案: