从单独表单上的列表框编辑记录

Question

在我的程序中，我允许用户从列表框中select 一条学生记录，当他们点击编辑按钮时，一个新的表单会打开。此表格显示他们 select 教过的学生的 ID 和分数。我需要让用户编辑该标记并更新列表框。我在让用户编辑时遇到了麻烦，如果有任何建议，我将不胜感激。（当我在编辑表单中包含用户数据时，我无法弄清楚该怎么做）谢谢。

我不被允许使用 LINQ，因此如果没有它，我将不胜感激。

点击编辑按钮时的主窗体：

private void btnEditMark_Click(object sender, EventArgs e)
{
    string[] s_rec_arr;

    if (lstMarks.SelectedIndex == -1)
    {
        MessageBox.Show("please select a student");
    }
    else
    {
        ModuleData.s_rec = lstMarks.SelectedItem.ToString();
        s_rec_arr = ModuleData.s_rec.Split(':');
        ModuleData.s_id = s_rec_arr[0];
        ModuleData.s_mark = s_rec_arr[1];
        editMark myEditRecordForm = new editMark(); // Opens a form called editMark
        this.Hide(); // Hides the previous form
        myEditRecordForm.ShowDialog(); // Shows the form
    }
}

编辑表单：

public partial class editMark : Form
{
    public editMark()
    {
        InitializeComponent();
        StartPosition = FormStartPosition.CenterScreen;
        txtStudentID.Focus();
    }


    private void btnSubmit_Click(object sender, EventArgs e)
    {

    }

    private void btnClose_Click(object sender, EventArgs e)
    {
        this.Hide();
        Form1 myForm = new Form1();
        myForm.ShowDialog();
    }

    private void editMark_Load(object sender, EventArgs e)
    {
        txtStudentID.Text = ModuleData.s_id;
        txtMark.Text = ModuleData.s_mark;
    }
}

Answer 1

我只写了我 changed.Other 部分与 yours.And 相同的部分代码，因为你希望没有 linq。

首先将 listBox 的修饰符属性设置为 Public 以便从另一个表单访问它。

现在我们开始使用代码。

Form1

public Form1()
{
    InitializeComponent();
    lstMarks.Items.Add("1:Bulutay"); //I don't know your list.This is my guess.
    lstMarks.Items.Add("2:Person2"); //
    lstMarks.Items.Add("3:Person3"); //
    lstMarks.Items.Add("4:Person4"); //
}

private void btnUpdate_Click(object sender, EventArgs e)
{
    string[] s_rec_arr;
    if (lstMarks.SelectedIndex == -1)
    {
        MessageBox.Show("please select a student");
    }
    else
    {
        ModuleData.s_rec = lstMarks.SelectedItem.ToString();
        s_rec_arr = lstMarks.SelectedItem.ToString().Split(':');
        ModuleData.s_id = s_rec_arr[0];
        ModuleData.s_mark = s_rec_arr[1];
        this.Hide(); //We hide our Main Form, it's still running at background and waiting to be shown again.We will use it.
        editMark myEditRecordForm = new editMark(); //Edit Form
        myEditRecordForm.Owner = this;  //We set New Edit Form's owner as this mainForm to access its lstMarks(listBox).
        myEditRecordForm.ShowDialog();
    }
}

表单编辑标记

private void btnSubmit_Click(object sender, EventArgs e)
{
    string data = txtStudentID.Text + ":" + txtMark.Text;
    string[] parts = data.Split(':');

    Form1 mainForm = (Form1)this.Owner; //We get our hidden owner's REFERENCE to mainForm object.

    for (int i = 0; i < mainForm.lstMarks.Items.Count; i++) //loops mainForm.lstMarks.Items.Count
    {
        string[] item = mainForm.lstMarks.Items[i].ToString().Split(':'); //We test all of items one by one.
        if (item[0] == ModuleData.s_id) //if listbox's current item's ID part equals to our static ModuleData.s_id
            mainForm.lstMarks.Items[i] = data;  //Set new data.
    }

    mainForm.Show(); //We show our old Main Form which we hided before.
    this.Close();
}

项目截图。

我选择了 Person3 并单击了“更新”按钮

更改数据

点击提交按钮

更新（新）数据

从单独表单上的列表框编辑记录

editing record from a list box on a separate form

c#

forms

editing