<!--得分数据结构-->
1 <Score>
2 <studentid>1</studentid>
3 <courseid>1</courseid>
4 <score>80</score>
5 </Score>
<!--科目数据结构-->
1 <Course>
2 <courseid>1</courseid>
3 <name>攻击力</name>
4 </Course>
<!--学生数据结构-->
1 <Student>
2 <studentid>1</studentid>
3 <name>大娃</name>
4 <sex>男</sex>
5 <age>13</age>
6 <remark>力大无穷</remark>
7 </Student>
1 //按年龄排序
2 public static List<Student> GetStudentsSortByAge()
3 {
4 try
5 {
6 //return Global.Data_students.OrderBy(stu => stu.age).ToList();
7 return Global.Data_students.OrderByDescending(stu => stu.age).ToList();
8 }
9 catch (Exception exp)
10 { }
11 return null;
12 }
1 //指定年龄区间
2 public static List<Student> GetStudentsByAgeBetween(int sage,int bage)
3 {
4 try
5 {
6 return Global.Data_students.Where(stu => (stu.age >= sage && stu.age < bage)).ToList();
7 }
8 catch (Exception exp)
9 { }
10 return null;
11 }
//姓名模糊查询
public static List<Student> GetStudentsByNameContains(string name)
{
try
{
return Global.Data_students.Where(stu =>stu.name.Contains(name)).ToList();
}
catch (Exception exp)
{ }
return null;
}
//指定性别查询
public static List<Student> GetStudentsBySexIs(string sex)
{
try
{
return Global.Data_students.Where(stu => stu.sex==sex).ToList();
}
catch (Exception exp)
{ }
return null;
}
1 //多表查询
2 public static List<Result> GetScores()
3 {
4 try
5 {
6 List<Result> lr = new List<WindowsFormsApplication1.Result>();
7 foreach (var v in Global.Data_scores.Join(Global.Data_courses, score => score.courseid, course => course.courseid, (score, course) => new
8 {
9 studentid = score.studentid,
10 coursename = course.name,
11 scores = score.score
12 }).Join(Global.Data_students, score => score.studentid, student => student.studentid, (score, student) => new
13 {
14 studentname = student.name,
15 coursename = score.coursename,
16 scores = score.scores
17 }).ToList()
18 )
19 {
20 Result r = new Result();
21 r.coursename = v.coursename;
22 r.score = v.scores;
23 r.studentname = v.studentname;
24 lr.Add(r);
25 };
26 return lr;
27 }
28 catch (Exception exp)
29 { }
30 return null;
31 }
