C# 列出课程表

我完成了我的学生时间表课程，交了上来，教授还给了我的作业，宣称“时间表是一个列表类，而不仅仅是studentid和crn”

好吧，现在我把这个列表放到了问题中，但是我每次都会犯错误。 我如何解决这个问题

我的教授要求： 属性：节数组和计数。构造函数：只需要一个默认构造函数。行为：添加（部分s）和显示（）。drop（）函数是可选的。要测试Schedule类，请实例化一个计划并向该计划中添加2个部分，然后显示（）该计划

我知道这就是我测试它的方式：

sch1 = new Schedule(); //create an empty schedule
sch1.add(new Section(30999, “CIST 9999”, “MW6-9pm”, “F1150”, 6));
sch1.add(new Section(30777, “CIST 9998”, “MW1-3pm”, “F1150”, 6));
sch1.display();  // you should see a list of 2 sections in this schedule

附表:

using System;
using System.Collections.Generic;
using System.Text;

namespace Schedule 
{
    class Schedule : Section
    {
         private int studentID;
         private int cRN;
    private List<Sections> SectionList;



    public Schedule() {
        this.studentID = 0;
         this.cRN = 0;
    }

        //++++++++++++++++  DATABASE Data Elements +++++++++++++++++
        public System.Data.OleDb.OleDbDataAdapter OleDbDataAdapter;
        public System.Data.OleDb.OleDbCommand OleDbSelectCommand;
        public System.Data.OleDb.OleDbCommand OleDbInsertCommand;
        public System.Data.OleDb.OleDbCommand OleDbUpdateCommand;
        public System.Data.OleDb.OleDbCommand OleDbDeleteCommand;
        public System.Data.OleDb.OleDbConnection OleDbConnection;
        public string cmd;

        public void DBSetup(){
        // +++++++++++++++++++++++++++  DBSetup function +++++++++++++++++++++++++++
        // This DBSetup() method instantiates all the DB objects needed to access a DB, 
        // including OleDbDataAdapter, which contains 4 other objects(OlsDbSelectCommand, 
        // oleDbInsertCommand, oleDbUpdateCommand, oleDbDeleteCommand.) And each
        // Command object contains a Connection object and an SQL string object.
            OleDbDataAdapter = new System.Data.OleDb.OleDbDataAdapter();
            OleDbSelectCommand = new System.Data.OleDb.OleDbCommand();
            OleDbInsertCommand = new System.Data.OleDb.OleDbCommand();
            OleDbUpdateCommand = new System.Data.OleDb.OleDbCommand();
            OleDbDeleteCommand = new System.Data.OleDb.OleDbCommand();
            OleDbConnection = new System.Data.OleDb.OleDbConnection();


            OleDbDataAdapter.DeleteCommand = OleDbDeleteCommand;
            OleDbDataAdapter.InsertCommand = OleDbInsertCommand;
            OleDbDataAdapter.SelectCommand = OleDbSelectCommand;
            OleDbDataAdapter.UpdateCommand = OleDbUpdateCommand;


OleDbConnection.ConnectionString = "Jet OLEDB:Global Partial Bulk Ops=2;Jet OLEDB:Reg"+
"istry Path=;Jet OLEDB:Database L" + 
"ocking Mode=1;Data Source=C:\Users\Tina\Desktop\RegistrationMDB.accdb;J" + 
"et OLEDB:Engine Type=5;Provider=Microsoft.Jet.OLEDB.4.0;Jet OLEDB:System datab" + 
"ase=;Jet OLEDB:SFP=False;persist security info=False;Extended Properties=;Mode=S" + 
"hare Deny None;Jet OLEDB:Encrypt Database=False;Jet OLEDB:Create System Database=False;Jet " + 
"OLEDB:Don't Copy Locale on Compact=False;Jet OLEDB:Compact Without Replica Repai" + 
"r=False;User ID=Admin;Jet OLEDB:Global Bulk Transactions=1";

        }



        public void SelectDB(int studentID) 
        { //++++++++++++++++++++++++++  SELECT +++++++++++++++++++++++++
            DBSetup();
            cmd = "Select * from Courses where StudentID = " + studentID;
            OleDbDataAdapter.SelectCommand.CommandText = cmd;
            OleDbDataAdapter.SelectCommand.Connection = OleDbConnection;
            Console.WriteLine(cmd);
            try  {
                    OleDbConnection.Open();
                    System.Data.OleDb.OleDbDataReader dr;
                    dr = OleDbDataAdapter.SelectCommand.ExecuteReader();

                    dr.Read();


                setStudentID(Int32.Parse(dr.GetValue(1)+""));
                    setCRN(Int32.Parse(dr.GetValue(1)+""));

            }
            catch (Exception ex) 
            {
                Console.WriteLine(ex);
            }
            finally 
            {
                OleDbConnection.Close();
            }                    
        } 

        public void InsertDB() {
        // +++++++++++++++++++++++++++  INSERT +++++++++++++++++++++++++++++++

            DBSetup();
            cmd = "INSERT into StudentSchedule values(" + getStudentID() + "," +
                             "'" + getCRN() + ")";

            OleDbDataAdapter.InsertCommand.CommandText = cmd;
            OleDbDataAdapter.InsertCommand.Connection = OleDbConnection;
            Console.WriteLine(cmd);
            try  
            {
                OleDbConnection.Open();
                int n = OleDbDataAdapter.InsertCommand.ExecuteNonQuery();
                if (n==1)
                    Console.WriteLine("Data Inserted");
                else
                    Console.WriteLine("ERROR: Inserting Data");
            }
            catch (Exception ex) 
            {
                Console.WriteLine(ex);
            }
            finally 
            {
                OleDbConnection.Close();
            }                
        } 

        public void updateDB() 
        {
            //++++++++++++++++++++++++++  UPDATE  +++++++++++++++++++++++++

            cmd = "Update StudentSchedule set StudentID = '" + getStudentID() + "'," + 
                        "CRN = '" + getCRN();

            OleDbDataAdapter.UpdateCommand.CommandText = cmd;
            OleDbDataAdapter.UpdateCommand.Connection = OleDbConnection;
            Console.WriteLine(cmd);
            try  
            {
                OleDbConnection.Open();
                int n = OleDbDataAdapter.UpdateCommand.ExecuteNonQuery();
                if (n==1)
                    Console.WriteLine("Data Updated");
                else
                    Console.WriteLine("ERROR: Updating Data");
            }
            catch (Exception ex) 
            {
                Console.WriteLine(ex);
            }
            finally 
            {
                OleDbConnection.Close();
            }                    
        }
        public void deleteDB() 
        {   
            //++++++++++++++++++++++++++  DELETE  +++++++++++++++++++++++++

            cmd = "Delete from StudentSchedule where StudentID = " + getStudentID();
            OleDbDataAdapter.DeleteCommand.CommandText = cmd;
            OleDbDataAdapter.DeleteCommand.Connection = OleDbConnection;
            Console.WriteLine(cmd);
            try  
            {
                OleDbConnection.Open();
                int n = OleDbDataAdapter.DeleteCommand.ExecuteNonQuery();
                if (n==1)
                    Console.WriteLine("Data Deleted");
                else
                    Console.WriteLine("ERROR: Deleting Data");
            }
            catch (Exception ex) 
            {
                Console.WriteLine(ex);
            }
            finally 
            {
                OleDbConnection.Close();
            }                    
        }

       public void setStudentID(int studentID) {
        this.studentID = studentID;
    }
       public void setCRN(int cRN) {
        this.cRN = cRN;
    }
      public int getStudentID() {
        return studentID;
    } 
       public int getCRN() {
        return cRN;
    } 

         public void display(){
        System.Console.WriteLine("Student ID =  "+ getStudentID());
        System.Console.WriteLine("CRN =   "+ getCRN());



    }
    }
}

这是学生时间表吗

---

是部分。

尽管我不喜欢做其他作业，但在没有数据库访问的情况下简单地将其分解，正如问题所读到的，可以分解为两个非常简单的类

课程表类别：

/// <summary>
/// Schedule class
/// </summary>
public class Schedule
{
    /// <summary>
    /// Creates a new instance of a schedule
    /// </summary>
    public Schedule()
    {
        this.sections = new List<Section>();
    }

    /// <summary>
    /// collection of sections
    /// </summary>
    ICollection<Section> sections;

    /// <summary>
    /// Adds a section
    /// </summary>
    /// <param name="section"></param>
    public void Add(Section section)
    {
        if (section == null)
            throw new ArgumentNullException("section");

        this.sections.Add(section);
    }

    /// <summary>
    /// Drops a section
    /// </summary>
    /// <param name="section"></param>
    public void Drop(Section section)
    {
        if (section == null)
            throw new ArgumentNullException("section");
        this.sections.Remove(section);
    }

    /// <summary>
    /// Returns an enumerable of all the sections
    /// </summary>
    /// <returns></returns>
    public IEnumerable<Section> Display()
    {
        return this.sections;
    }

}

//
///课程表
/// 
公课时间表
{
/// 
///创建明细表的新实例
/// 
公共附表（
{
this.sections=新列表（）；
}
/// 
///章节集
/// 
i采集断面；
/// 
///添加一个节
/// 
/// 
公共无效添加（第节）
{
if（节==null）
抛出新的异常（“节”）；
本节。添加（节）；
}
/// 
///删除一节
/// 
/// 
公共空投（第节）
{
if（节==null）
抛出新的异常（“节”）；
本节。删除（节）；
}
/// 
///返回所有节的可枚举项
/// 
/// 
公共IEnumerable显示（）
{
将此文件退还给我；
}
}

组别：

/// <summary>
/// Section class
/// </summary>
public class Section
{
    /// <summary>
    /// Creates a new instance of a section
    /// </summary>
    /// <param name="crn"></param>
    /// <param name="courseId"></param>
    /// <param name="timeDays"></param>
    /// <param name="roomNumber"></param>
    /// <param name="instructor"></param>
    public Section(int crn, string courseId, string timeDays, string roomNumber, int instructor)
        :this(crn, courseId, timeDays, roomNumber, instructor, "")
    {
    }

    /// <summary>
    /// Creates a new instance of a section
    /// </summary>
    /// <param name="crn"></param>
    /// <param name="courseId"></param>
    /// <param name="timeDays"></param>
    /// <param name="roomNumber"></param>
    /// <param name="instructor"></param>
    /// <param name="message"></param>
    public Section(int crn, string courseId, string timeDays, string roomNumber, int instructor, string message)
    {
        this.Crn = crn;
        this.CourseId = courseId;
        this.TimeDays = timeDays;
        this.RoomNumber = roomNumber;
        this.Instructor = instructor;
        this.Message = message;
    }

    /// <summary>
    /// Gets or sets the crn
    /// </summary>
    public int Crn { get; set; }

    /// <summary>
    /// gets or sets the course id
    /// </summary>
    public string CourseId { get; set; }

    /// <summary>
    /// gets or sets the time days
    /// </summary>
    public string TimeDays { get; set; }

    /// <summary>
    /// gets or sets the room number
    /// </summary>
    public string RoomNumber { get; set; }

    /// <summary>
    /// Gets or sets the instructor
    /// </summary>
    public int Instructor { get; set; }

    /// <summary>
    /// Gets or sets the message
    /// </summary>
    public string Message { get; set; }
}

//
///节课
/// 
公共课组
{
/// 
///创建节的新实例
/// 
/// 
/// 
/// 
/// 
/// 
公共部分（int crn、字符串courseId、字符串timeDays、字符串roomNumber、int讲师）
：此（crn、courseId、timeDays、roomNumber、讲师，“”）
{
}
/// 
///创建节的新实例
/// 
/// 
/// 
/// 
/// 
/// 
/// 
公共部分（int crn、字符串courseId、字符串timeDays、字符串roomNumber、int讲师、字符串消息）
{
这个.Crn=Crn；
this.CourseId=CourseId；
this.TimeDays=TimeDays；
this.RoomNumber=RoomNumber；
这个。讲师=讲师；
this.Message=消息；
}
/// 
///获取或设置crn
/// 
公共int Crn{get；set；}
/// 
///获取或设置课程id
/// 
公共字符串CourseId{get；set；}
/// 
///获取或设置每天的时间
/// 
公共字符串TimeDays{get；set；}
/// 
///获取或设置房间号
/// 
公共字符串RoomNumber{get；set；}
/// 
///获取或设置讲师
/// 
公共int讲师{get；set；}
/// 
///获取或设置消息
/// 
公共字符串消息{get；set；}
}

既然这是一项作业，你应该能够讨论它是如何运作的。基本上，

Schedule

类包含一个节的私有集合。

Add

方法通过调用节构造函数来添加一个

节

如果您使用的是数据访问，则只需删除集合并直接使用数据库即可。
您会遇到什么样的错误？如果您将问题本地化，则会有所帮助，否则此问题不适合StackOverflow。将节添加到计划列表是一个错误。当我看到名为
deleteDB（）
的函数时，我会感到害怕。它是用于学校的，而不是真实的数据库。这是教我们如何做任何我感到困惑的事情
/// <summary>
/// Section class
/// </summary>
public class Section
{
    /// <summary>
    /// Creates a new instance of a section
    /// </summary>
    /// <param name="crn"></param>
    /// <param name="courseId"></param>
    /// <param name="timeDays"></param>
    /// <param name="roomNumber"></param>
    /// <param name="instructor"></param>
    public Section(int crn, string courseId, string timeDays, string roomNumber, int instructor)
        :this(crn, courseId, timeDays, roomNumber, instructor, "")
    {
    }

    /// <summary>
    /// Creates a new instance of a section
    /// </summary>
    /// <param name="crn"></param>
    /// <param name="courseId"></param>
    /// <param name="timeDays"></param>
    /// <param name="roomNumber"></param>
    /// <param name="instructor"></param>
    /// <param name="message"></param>
    public Section(int crn, string courseId, string timeDays, string roomNumber, int instructor, string message)
    {
        this.Crn = crn;
        this.CourseId = courseId;
        this.TimeDays = timeDays;
        this.RoomNumber = roomNumber;
        this.Instructor = instructor;
        this.Message = message;
    }

    /// <summary>
    /// Gets or sets the crn
    /// </summary>
    public int Crn { get; set; }

    /// <summary>
    /// gets or sets the course id
    /// </summary>
    public string CourseId { get; set; }

    /// <summary>
    /// gets or sets the time days
    /// </summary>
    public string TimeDays { get; set; }

    /// <summary>
    /// gets or sets the room number
    /// </summary>
    public string RoomNumber { get; set; }

    /// <summary>
    /// Gets or sets the instructor
    /// </summary>
    public int Instructor { get; set; }

    /// <summary>
    /// Gets or sets the message
    /// </summary>
    public string Message { get; set; }
}