将姓名和分数传给另一个表格(C#)

本文关键字：表格 另一个 | 更新日期: 2023-09-27 18:20:38

我正试图将用户输入从我的AddNewStudent表单传递到我的主StudentScores窗体（我单击StudentScores窗体上的"添加新"按钮，AddNewStudent窗体弹出…我输入我的值…然后按"确定"按钮…希望在StudentScore列表框中显示值）。然而，我还不完全熟悉使用类和使用多表单程序，所以我不仅工作速度比平时慢，而且很难弄清楚这一点。非常感谢您的帮助。

我已经有三个初始化的名称和分数，它们用一个|管道字符分隔。我试图在StudentScores列表框中以相同的格式显示任何用户输入。我希望默认情况下有这三个名字和分数。谢谢你抽出时间。

我的学生班：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace My_Program
{
public class Student
{
    public Student()
    {
        this.Scores = new List<int>();

    }
    public Student (string Name, List<int> Scores)
    { this.Name = Name;
        this.Scores = Scores;
    }
    public string Name
    { get;
        set;
    }
    public List<int> Scores
    { get;
      set;
    }
    public override string ToString()
    {
            string names= this.Name;
            foreach (int myScore in Scores)
            { names += "|" + myScore.ToString();

                }
        return names;
    }
    public int GetscoreTotal()
    { int sum = 0;
        foreach (int score in Scores)
        {
            sum += score;

        }
        return sum;
        }
    public int GetScoreCount()
    { return Scores.Count;
    }
    public void addScore(int Score)
    {
        Scores.Add(Score);
    }
}
}

我的主要表格AKA学生成绩表格

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace My_Program
{
public partial class StudentScores : Form
{
    //list of students declared
    public List<Student> studentList = new List<Student>();
    List<Student> Students;
    public StudentScores()
    {
        InitializeComponent();

       // listBoxStudents.DataSource = Students;
    }
    private void StudentScore_Load(object sender, EventArgs e)
    {
        //initialized 3 students for list box upon loading program...
        Students = new List<Student>();
        Student student1 = new Student();
        student1.Name = "George Mendoza";
        student1.Scores.Add(97);
        student1.Scores.Add(71);
        student1.Scores.Add(83);
        Students.Add(student1);
        listBoxStudents.Items.Add(student1);
        Student student2 = new Student();
        student2.Name = "John Doe";
        student2.Scores.Add(99);
        student2.Scores.Add(93);
        student2.Scores.Add(97);
        Students.Add(student2);
        listBoxStudents.Items.Add(student2);
        Student student3 = new Student();
        student3.Name = "Bill Cruz";
        student3.Scores.Add(100);
        student3.Scores.Add(100);
        student3.Scores.Add(100);
        Students.Add(student3);
        listBoxStudents.Items.Add(student3);



    }
    private void btnAddNew_Click(object sender, EventArgs e)
    {
        //calls form2 aka AddNewStudent form.
        AddNewStudent frm = new AddNewStudent();
        frm.ShowDialog();
    }
    private void btnDelete_Click(object sender, EventArgs e)
    {
        //code something that will delete entries...message box is a start
      DialogResult dialog = MessageBox.Show("Are you sure you want to delete your entries?", "Message", MessageBoxButtons.YesNoCancel);
        if (dialog == DialogResult.Yes)
        {
            while (listBoxStudents.SelectedItems.Count > 0)
            {
                listBoxStudents.Items.Remove(listBoxStudents.SelectedItems[0]);
            }
        }
    }
    private void listBoxStudents_SelectedIndexChanged(object sender, EventArgs e)
    {    

    }
    private void btnExit_Click(object sender, EventArgs e)
    {
        this.Close();
    }
}
}

添加新学生表格（我添加新名字和分数并将其发送到StudentScores表格的表格）：

using System;
using System.Collections.Generic;
using System.ComponentModel; 
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace My_Program
{
public partial class AddNewStudent : Form
{
    List<Student> Students;

    public AddNewStudent()
    {
        InitializeComponent();

    }
    public AddNewStudent (List <Student> Students)
    {
        this.Students = Students;
    }

    private void btnCancel_Click(object sender, EventArgs e)
    {
        this.Close(); 
    }
    private void btnAddScore_Click(object sender, EventArgs e)
    {
        int score = Convert.ToInt32(txtScore.Text);
        //...
    }
    private void btnOk_Click(object sender, EventArgs e)
    {
        string name = Convert.ToString(txtName.Text);
        if (name == string.Empty)
        {
            MessageBox.Show("Please enter a name before continuing.", "Entry Error.");
        }
        else
        {
           //stuck here...
        }
        }

    }
    private void btnClearScores_Click(object sender, EventArgs e)
    {
       //clears both the score and scores text box
        txtScore.Text = "";
        txtScores.Text = "";
        txtScore.Focus();
    }
}

}

将姓名和分数传给另一个表格(C#)

您应该；

  1. 将StudentScores中listBoxStudents的访问修饰符更改为public

  2. 实现AddNewStudent表单的构造函数以接受StudentScores实例。将StudentScores实例存储在字段中。

    private StudentScores _studentScoresForm;
public AddNewStudent(StudentScores studentScoresForm) : this()
{
  _studentScoresForm = studentScoresForm;
}
public AddNewStudent()
{
    InitializeComponent();
}

  3. 通过传递this 创建AddNewStudent表单的实例

    private void btnAddNew_Click(object sender, EventArgs e)
{
    //calls form2 aka AddNewStudent form.
    AddNewStudent frm = new AddNewStudent(this);
    frm.ShowDialog();
}

4.在AddNewStudent表格中，当发生更改（添加新学生）并单击"确定"按钮时：

Student student1 = new Student();
student1.Name = name;
student1.Scores.Add(score);
_studentScoresForm.listBoxStudents.Add(student1);

如@Oguz所述，您希望将StudentScores表单作为变量传递给AddNewStudent表单。

这将允许您从AddNewStudent表单访问StudentScores表单中的任何公共属性。换句话说，您可以访问原始学生列表并向其中添加新学生。只传递StudentScores表单的变量引用，因此所有更改都会反映在原始学生列表中。

在AddNewStudent表单中，此构造函数永远不会被调用：

    public AddNewStudent (List <Student> Students)
{
    this.Students = Students;
}

所以我认为你想做的是使用它来改变这个：

   private void btnAddNew_Click(object sender, EventArgs e)
{
    //calls form2 aka AddNewStudent form.
    AddNewStudent frm = new AddNewStudent();
    frm.ShowDialog();
}

到此：

   private void btnAddNew_Click(object sender, EventArgs e)
{
    //calls form2 aka AddNewStudent form.
    AddNewStudent frm = new AddNewStudent(Students);
    frm.ShowDialog();
}

现在，您可以将学生列表传递到表格中，在那里您可以对其进行更改。

最专业的方法是使用委托

在AddNewstudent表单中创建一个具有所需的四个参数的代表

public delegate void PassControl(string a,int b,int c,int d);
public PassControl passControl;

点击AddNewStudent表单中的OK按钮

 private void button1_Click(object sender, EventArgs e)
        {
            if (passControl != null)
            {
                passControl(txtName.Text,int.Parse(txt1.Text),int.Parse(txt2.Text),int.Parse(txt3.Text));
            }
        }

在学生成绩表中点击添加新按钮

  private void btnAddNew_Click(object sender, EventArgs e)
        {
            //calls form2 aka AddNewStudent form.
            AddNewStudent frm = new AddNewStudent();
            frm.passControl = new C2.PassControl(this.PassData);
            frm.ShowDialog();
        }

在学生成绩表中写一个它所指向的委托函数。

  private void PassData(string a,int b,int c,int d)
        {
            Student student1 = new Student();
            student1.Name = a;
            student1.Scores.Add(b);
            student1.Scores.Add(c);
            student1.Scores.Add(d);
            Students.Add(student1);
            listBoxStudents.Items.Add(student1);
        }
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