Hello, I'm having trouble getting a part of this program to work... the update student part is supposed to update/edit student's scores.
When i run the program i cant get the bttnUpdate to work in the frmMaintStudentScores.cs. can someone help me fix it?
the other parts of the program are working.
frmUpdateStudentScores.cs
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 WindowsFormsApplication4
{
public partial class frmUpdateStudentScores : Form
{
public static Dictionary<string, List<int>> tmpStudents;
BindingSource bs = new BindingSource();
public static int selected;
public frmUpdateStudentScores()
{
InitializeComponent();
}
private void frmUpdateStudentScores_Load(object sender, EventArgs e)
{
tmpStudents = frmMaintStudentScores.students.ToDictionary(p => p.Key, p => p.Value.ToList());
}
private void frmUpdateStudentScores_Activated(object sender, EventArgs e)
{
txtName.Text = tmpStudents.Keys.ElementAt(frmMaintStudentScores.selected);
bs.DataSource = tmpStudents.Values.ElementAt(frmMaintStudentScores.selected);
lbxScores.DataSource = bs;
lbxScores.Focus();
}
private void bttnAdd_Click(object sender, EventArgs e)
{
Form addScore = new frmAddScore();
addScore.ShowDialog();
bs.ResetBindings(false);
}
private void BttnOk_Click(object sender, EventArgs e)
{
frmMaintStudentScores.students = tmpStudents;
this.Close();
}
private void bttnRemove_Click(object sender, EventArgs e)
{
tmpStudents.Values.ElementAt(frmMaintStudentScores.selected).RemoveAt(lbxScores.SelectedIndex);
bs.ResetBindings(false);
}
private void bttnUpdate_Click(object sender, EventArgs e)
{
selected = lbxScores.SelectedIndex;
Form updateScore = new frmUpdateScore();
updateScore.ShowDialog();
bs.ResetBindings(false);
}
private void bttnClreaScores_Click(object sender, EventArgs e)
{
tmpStudents.Values.ElementAt(frmMaintStudentScores.selected).RemoveRange(
0, tmpStudents.Values.ElementAt(frmMaintStudentScores.selected).Count);
bs.ResetBindings(false);
}
}
}
main form: frmMaintStudentScores.cs
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 WindowsFormsApplication4
{
public partial class frmMaintStudentScores : Form
{
public static Dictionary<string, List<int>> students = new Dictionary<string, List<int>>();
public static int selected;
public frmMaintStudentScores()
{
InitializeComponent();
}
// private frmMaintStudentScores parentForm;
private void frmStudentScores_Load(object sender, EventArgs e)
{
students.Add("Peter Cornell", new List<int> { 20, 30, 50 });
students.Add("Joe Whatsits", new List<int> { 24, 44, 34 });
students.Add("Jane Harris", new List<int> { 64, 43, 65 });
AddToListbox();
}
private void AddToListbox()
{
foreach (var student in students)
{
StringBuilder sb = new StringBuilder();
sb.Append(student.Key.ToString());
sb.Append(" - ");
for (int i = 0; i < student.Value.Count; i++)
{
sb.Append(student.Value[i]);
if (i != student.Value.Count - 1)
{
sb.Append(", ");
}
}
lbxStudents.Items.Add(sb);
lbxStudents.SetSelected(0, true);
UpdateInfo();
}
}
private void UpdateInfo()
{
try
{
txtScoreTotal.Text = students.Values.ElementAt(lbxStudents.SelectedIndex).Sum().ToString();
txtScoreCount.Text = students.Values.ElementAt(lbxStudents.SelectedIndex).Count.ToString();
txtAverage.Text = Math.Round(students.Values.ElementAt(lbxStudents.SelectedIndex).Average()).ToString();
}
catch (Exception)
{
txtScoreTotal.Text = "";
txtScoreCount.Text = "";
txtAverage.Text = "";
}
}
private void lbxStudents_SelectedIndexChanged(object sender, EventArgs e)
{
UpdateInfo();
}
private void bttnAddNew_Click(object sender, EventArgs e)
{
Form addNewStudent = new frmAddNewStudent();
addNewStudent.ShowDialog();
lbxStudents.Items.Clear();
AddToListbox();
}
private void btnUpdate_Click(object sender, EventArgs e)
{
Form updateScores = new frmUpdateStudentScores();
int index = lbxStudents.SelectedIndex;
if (lbxStudents.Items.Count > 0)
{
updateScores.ShowDialog();
}
lbxStudents.Items.Clear();
AddToListbox();
}
private void bttnDelete_Click(object sender, EventArgs e)
{
students.Remove(students.Keys.ElementAt(lbxStudents.SelectedIndex));
lbxStudents.Items.Clear();
AddToListbox();
if (students.Count == 0)
{
txtScoreTotal.Text = "";
txtScoreCount.Text = "";
txtAverage.Text = "";
}
}
private void frmStudentScores_Activated(object sender, EventArgs e)
{
UpdateInfo();
}
}
}
}}
