CODEWITHSUNDEEP
c#.netlist
Christopher
Christopher

Reputation: 371

Updating a List<Class>

I have a list of a class, how do I find edit the class at a particular list location.

I am trying to update a List<Class>, but I have no idea how to pass the values back to the class. i.e. I do not know how to call the list at location 2 changed the class values 1,2,3,4,5 to 6,7,8,9,0

the class is a form and the method I want to use will essentially be:

public FormStudent(int a, string b, int c, double d, char f)
{
    textBoxID.Text = a.ToString();
    textBoxName.Text = b;
    textBoxCredits.Text = c.ToString();
    textBoxTuition.Text = d.ToString();
    if (f == 'R')
        radioButtonResident.Checked = true;
    else
        adioButtonNonResident.Checked = true;
}

My list is: 

  private List<Student> studentList = new List<Student>();

oh! and to make it even more difficult I am getting the list value from a listView via

private void buttonUpdate_Click(object sender, EventArgs e)
{
    Student stu = new Student();

    ListView.SelectedListViewItemCollection selectedItems = listView1.SelectedItems;
    int count = selectedItems.Count;
    for (int i = 0; i < count; i++)
    {                   
        // I NEED THE UPDATE HERE TO CALL \/
        FormStudent stuInfoForm = new FormStudent(stu.Id, stu.Name, stu.Credits, stu.Tuition, stu.Residency);

        studentList.RemoveAt(i);
        stuInfoForm.Owner = this;
        stuInfoForm.ShowDialog();
    }
    refreshList();
}

Upvotes: 0

Views: 6695

Answers (3)

Peyton Crow
Peyton Crow

Reputation: 882

I only use the Id member of student to pass but you can pass it all.

Basically in your main form you had:

 private List<Student> studentList = new List<Student>();

 private void listView1_DoubleClick(object sender, EventArgs e) {
        ListView.SelectedListViewItemCollection selectedItems = listView1.SelectedItems;
        if (selectedItems != null && selectedItems.Count > 0) {
            ListViewItem item = selectedItems[0];
            Form2 form = new Form2(item.Text);
            form.Owner = this;
            form.ShowDialog();

            // Now get the values from the form.
            Student updateStudent = studentList.Find(o => o.Id == form.Student.Id);
            if (updateStudent != null) {
                updateStudent.Id = form.Student.Id;
                // Update the rest of the members.
            }

            // Re-populate your list using the updated student list.
        }
    }

Now in your second form student form:

    private Student _student = new Student();

    public Form2(string id) {
        InitializeComponent();
        textBox1.Text = id;
    }

    public Student Student {
        get {
            return _student;
        }
    }

    private void button1_Click(object sender, EventArgs e) {
        _student.Id = Convert.ToInt32(textBox1.Text);
        this.Close();
    }

Upvotes: 0

Tomas Jansson
Tomas Jansson

Reputation: 23462

Maybe you are missing a databind? It is hard to actually understand what you are doing. It seems like you are removing students at the same time as you are creating them, seems weird.

Upvotes: 0

Christo
Christo

Reputation: 9075

just index it:

List<int> list = new List<int>();
list.Add(1);
list.Add(2);
...
list.Add(5);

list[2] = 7;

Upvotes: 2

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