Question

我是Linq的新手。我有一个要求，有2个列表，一个是学生列表，另一个是标记列表。在学生中我们有id，姓名和标记列表id（sid），标记，科目。需要输出每个学生的学生ID，姓名和总分。我已经接近了以下代码，

 class Student
 {
     public int Id { get; set; }
     public string name { get; set; }
 }

 class Marks
 {
     public int Sid {get;set;}
     public int mark {get;set;}
     public string subjects {get;set;}
 }

 class Program
 {
     static void Main(string[] args)
     {
         //student
        List<Student> studentList = new List<Student>()
        {
             new Student() { Id = 1, name = "A" },
             new Student() { Id = 2, name = "B" }
        };

        //marks
        List<Marks> markList = new List<Marks>()
        {
            new Marks() { Sid = 1, mark = 30, subjects = "A1" },
            new Marks() { Sid = 1, mark = 40, subjects = "A2" },
            new Marks() { Sid = 2, mark = 40, subjects = "B1" },
            new Marks() { Sid = 1, mark = 50, subjects = "B2" }
        };

         var result=(from stu in studentList
                     join mar in markList 
                         on stu.Id equals mar.Sid                            
                     select new
                         {
                            stu.Id,
                            stu.name,
                            mar.mark,
                            mar.subjects
                         })
                     .GroupBy(x => x.subjects).ToList();

以上Linq查询并不符合我的要求。有什么建议吗？

Answer 1

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    android:accessibilityFeedbackType="feedbackGeneric"
    android:accessibilityFlags="flagReportViewIds"
    android:canRetrieveWindowContent="true"
    android:notificationTimeout="100" />

MarksCount - 此学生的总分数标记 - 该学生的分数列表

Linq加入两个列表

1 个答案: