c# - 在 LINQ 查询的 where 子句中传递 int 数组

Question

有一个类

Public class Student
{
  int id;
  int rollNum;
  String Name;
}

一个方法

Public List<Student> GetAllStudents()
{
  var studentList = GetMeAll(); // Simple select * query to get all students
  //unfortunately i can't make changes in this method so have to write a linq query to       //filter data.
  //getting int array ids correctly from some method
   var filterList = FilterStudentsByID(ids,StudentList);
}

我想写一个方法，将一个int数组作为输入并返回一个List

Public List<Student> FilterStudentsByID(int[] ids,List<student> studentList)
{
  //There should be a linq query , but I am new to linq so don't know how to write this.
  Var list = from  studentList in ..... don't know much;
}

编写查询的任何帮助。谢谢大家的回答，我也在寻找维护具有大量记录的表演??如果您能给我添加关于查询将在内部工作的简单解释，那就太好了？？

Answer 1

如果您要从列表中找到那些 ID 存在于 ids 数组中的学生，那么:

var list = from s in stundentList
           where ids.Contains(s.ID)
           select s;