C# 引用类型对象未得到更新，但返回更新的对象

我正在将“引用类型”传递给函数“BY VAL”。在函数中，我试图修改foreach循环中的引用类型

然后当涉及到打电话的人时， 我传递的对象未得到更新。 但是返回更新的对象

我在下面给出了这个问题的例子

有人能帮我解释一下为什么会发生这样的事情吗

下面是GetStudents（）和FilterStudents（）的方法， 班级，学生，老师，班级

SSCClass-包含教师数组。 教师-包含学生数组

    public void GetStudents()
    {

        Student[] sscStudentsOne = new Student[] { new Student { V_SId = 1, V_SName = "Kumar" }, new Student { V_SId = 2, V_SName = "Varun" }, new Student { V_SId = 3, V_SName = "Murthy" } };

        Student[] sscStudentsTwo = new Student[] { new Student { V_SId = 4, V_SName = "Sathya" }, new Student { V_SId = 5, V_SName = "Krishna" }, new Student { V_SId = 6, V_SName = "Bindu" } };


        Teacher[] sscTeachers = new Teacher[] { new Teacher { V_tId = 1, V_tName = "Jyothi", V_Students = sscStudentsOne }, new Teacher { V_tId = 2, V_tName = "Srinivas", V_Students = sscStudentsTwo } };

        SSCClass objSSCClass = new SSCClass();
        objSSCClass.V_sscTeachers = sscTeachers;

        SSCClass objSSCClassFiltered =  FilterStudents(objSSCClass);
        // Problem :-
        // in objSSCClass Kumar is getting removed but Sathya from second teachere is not getting removed.
        // in objSSCClassFiltered  Kumar and Sathya are Getting removed as we did.
        // We need objSSCClass object to be updated successfully ..  as we can not return this to caller method in my project.

    }
    public SSCClass FilterStudents(SSCClass objSSCClasstobeFiltered)
    {

        foreach (Teacher item in objSSCClasstobeFiltered.V_sscTeachers)
        {

            // here a method will be called and does the below
            // removes Students based on some criteria
            // Say,
            // Remove Student Kumar  from first teacher.
            // Remove Student Sathya from second teacher

        }

        // after filtering Students return the SSC Class object

        return objSSCClasstobeFiltered;
    }

    public class Student
    {

        int v_sId;

        public int V_SId
        {
            get { return v_sId; }
            set { v_sId = value; }
        }

        string v_SName;

        public string V_SName
        {
            get { return v_SName; }
            set { v_SName = value; }
        }
    }

    public class Teacher
    {

        int v_tId;

        public int V_tId
        {
            get { return v_tId; }
            set { v_tId = value; }
        }


        string v_tName;

        public string V_tName
        {
            get { return v_tName; }
            set { v_tName = value; }
        }


        Student[] v_Students;

        public Student[] V_Students
        {
            get { return v_Students; }
            set { v_Students = value; }
        }
    }


    public class SSCClass
    {
        Teacher[] v_sscTeachers;

        public Teacher[] V_sscTeachers
        {
            get { return v_sscTeachers; }
            set { v_sscTeachers = value; }
        }

    }

---

您不能更新ForeachRef，创建一个新的，然后更新它：

Foreach (Student s in student_list)
{...
   S s2 = s;
     s2 = newval;
...}

---

发布您遇到问题的函数的代码，因为我自己并不了解问题的核心。问题是什么？您能添加实际代码而不仅仅是注释吗，谢谢。还要添加删除项目的代码。谢谢您的回复。我调用函数FilterStudents（objSSCClass），如下所示。SSCClass objSSCClassFiltered=过滤器学生（objSSCClass）；“修改foreach中的引用类型”听起来更像是更改对象的内部状态，而不是变量的引用。也许我错了，但这似乎与OP的问题无关。