[英]Linq query to filter multi level classes
我的部門數據來自數據庫。 我想根據某些條件過濾此數據。
[
{
"Id":10,
"Name":"Name 10",
"Teachers":[
{
"TeacherId":100,
"TeacherName":null,
"DepartmentId":100,
"Students":[
{
"StudentId":1001,
"StudentName":null,
"TeacherId":10,
"DepartmentId":100
}
]
},
{
"TeacherId":101,
"TeacherName":null,
"DepartmentId":100,
"Students":[
{
"StudentId":1001,
"StudentName":null,
"TeacherId":10,
"DepartmentId":100
}
]
}
]
},
{
"Id":100,
"Name":"Name 10",
"Teachers":[
{
"TeacherId":0,
"TeacherName":null,
"DepartmentId":100,
"Students":[
{
"StudentId":5000,
"StudentName":null,
"TeacherId":50,
"DepartmentId":100
}
]
}
]
},
{
"Id":50,
"Name":"Name 10",
"Teachers":[
{
"TeacherId":0,
"TeacherName":null,
"DepartmentId":100,
"Students":[
{
"StudentId":2000,
"StudentName":null,
"TeacherId":50,
"DepartmentId":100
}
]
}
]
}
]
現在我必須根據一些值來過濾部門,如下所示
var departmenIds = new List<int>() { 10, 20, 30 };
var teachers = new List<int>() { 100, 200, 300 };
var students = new List<int>() { 1000, 2000, 3000 };
我正在尋找一個查詢,它將以以下方式返回數據
如果json中存在所有部門ID,它將返回整個數據。 如果列表中有一個具有特定老師的部門,則僅返回該老師和該部門。 對學生來說是明智的。
我試圖以此來測試它是否至少在第二級工作,但是我正在讓所有老師
var list = allDeplrtments.Where(d => d.Teachers.Any(t => teachers.Contains(t.TeacherId))).ToList();
var list = allDepartments
.Where(d => departmentIds.Contains(d.Id))
.Select(d => new Department() {
Id = d.Id,
Name = d.Name,
Teachers = (d.Teachers.Any(t => teacherIds.Contains(t.TeacherId))
? d.Teachers.Where(t => teacherIds.Contains(t.TeacherId))
: d.Teachers)
.Select(t => new Teacher() {
TeacherId = t.TeacherId,
TeacherName = t.TeacherName,
DepartmentId = d.Id,
Students = t.Students.Any(s => studentIds.Contains(s.StudentId))
? t.Students.Where(s => studentIds.Contains(s.StudentId))
: t.Students
})
})
這樣的事情對您有用嗎?
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