我有以下Student
课程,每个ID都有一个考试列表,我需要将考试列映射到Exams_Line_list
的属性。以下代码返回空Exams_Line_list
public class Student
{
string id;
public List<String> exams_Line_list = new List<String>();
public String exams_Line1;
public string Exams_Line1
{
get { return exams_Line1; }
set { exams_Line1 = value; }
}
public string ID
{
get { return id; }
set { id = value; }
}
public List<String> Exams_Line_list
{
get { return exams_Line_list; }
set { exams_Line_list = value; }
}
}
阅读Excel表格:
IQueryable<Student> Students_var;
var excel = new ExcelQueryFactory(fileName_global1);
excel.AddMapping<Student>(x => x.ID, "STU_NO");
excel.AddMapping<Student>(x => x.Exams_Line1, "Exam");
Students_var = from c in excel.Worksheet<Student>("Stu_Schedule")
select c;
List<Student> StudentList_c = Students_var.ToList();
var grouped = StudentList_c.GroupBy(x => x.ID).Select(x => new Student
{
ID = x.Key,
Exams_Line_list = x.SelectMany(z => z.Exams_Line_list).ToList()
}).ToList();
foreach (var r in grouped)
{
Console.WriteLine(r.ID);
foreach (String s1 in r.Exams_Line_list)
Console.WriteLine(s1);
}
架构:
我添加了一个String属性来映射Exam列,(Exams_Line1
)
断点StudentList_c
现在它会读取所有行,包括每个考试值的重复ID,但是如何将它们分组到定义的列表(Exams_Line1
)
答案 0 :(得分:0)
可能你可以使用这个:
var grouped = StudentList_c.GroupBy(x => x.ID).Select(x => new Student
{
ID = x.Key,
Exams_Line_list = x.Select(z => z.Exams_Line1).ToList()
}).ToList();
这里我假设Student_List
包含与excel表中行相对应的所有行,Exams_Line1
属性正在映射到Exam
列。