如何根據C＃中另一個列表/主列表中的對象列表對對象列表進行排序？

Question

我有以下對象結構-

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

我也有2對象列表，如下所示：
1）主清單-

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）子列表

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"}
            };

我想對我的子列表進行排序，像在應用主列表中的對象排序之后一樣，將主列表中的對象順序排序為-

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"}

是否有可能實現這種排序邏輯？

Answer 1

假設RollNumber是標識字段：

var orderedSubList = subList.OrderBy (
    s => masterList.IndexOf(masterList.FirstOrDefault(m => m.RollNumber == s.RollNumber))
);

Answer 2

//假設沒有重復的記錄。

        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

當然可以，但是您應該問自己，什么可以識別學生。 因為列表當前在對象標識方面不包含相同的學生。

如果是這樣，即masterList和subList實際上包含相同的對象，則可以通過以下命令對其進行排序

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

否則，您必須識別學生，例如使用RollNumber。

編輯：與kaarel的答案相比，此解決方案會將列表排序到位，而kaarel的解決方案可能更易於閱讀。