Question

我正在尝试将用户输入从 AddNewStudent 表单传递到我的主 StudentScores 表单（我单击StudentScores表单上的btnAddNew按钮，弹出AddNewStudent表单.. 。我输入我的值...然后按btnOk按钮...希望将值显示在StudentScores列表框中）。但是，我还不熟悉使用类和使用多表单程序，因此我不仅比平常工作慢，而且我一直很难搞清楚这一点。非常感谢任何帮助。

我已经有三个初始化的名称和分数由|分隔管道人物。我试图在StudentScores列表框中以相同的格式显示任何用户输入。我想默认拥有这三个名字和分数。谢谢你的时间。

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 StudentScores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();
    }
}
}

AddNewStudent 表单（我添加新名称和分数并将其发送到StudentScores表单的表单）：

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();

    }
}

}

Answer 1

你应该;

将listBoxStudents中的StudentScores的访问修饰符更改为public

在AddNewStudent表单中实现构造函数以接受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();
}

通过传递AddNewStudent

创建this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表单中，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);

Answer 2

正如 @Oguz 已经解释过，您希望将StudentScores表单作为变量传递给AddNewStudent表单。

这样，您就可以从StudentScores表单访问AddNewStudent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添加新学生。只传递StudentScores表单的变量引用，以便所有更改都反映在原始学生列表中。

Answer 3

在AddNewStudent表单中，永远不会调用此构造函数：

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

所以我认为你想要做的就是改用它来改变它：

   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，您将学生列表传递到可以对其进行更改的表单。

Answer 4

最专业的方法是使用代表

在AddNewstudent表单中，创建一个包含四个必需参数的委托

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

单击AddNewStudent表单中的确定按钮

 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));
            }
        }

点击“添加新按钮”时，在学生分数表格中

  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();

        }

在学生分数表格中写一个委托函数。

  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);
        }

将姓名和分数传递给另一种形式（C＃）

4 个答案: