How to bind a list which is a property of an object to DataGridView?

Mas Bagol Published at Dev

Mas Bagol

I have two object. One of them has a property which is a list of other object. For example, I have an object Klass that has students property that contains a list of Student objects. I need my DataGridView to display data of students of the selected Klass object which is selected via a ComboBox. So, whenever I change the selected Klass with ComboBox, the data DataGridView will display a list of students according to the selected Klass object.

The simplified code written like this:

Student class:

public class Student
{
    public string name { get; set; }
    public string address { get; set; }
}

Klass class:

public class Klass
{
    public string name { get; set; }
    public BindingList<Student> students { get; set; }
}

Is there anyway to do that?

Tim Eeckhaut

Set the combobox displaymember:

        public Form1()
        {
            InitializeComponent();

            comboBox1.DisplayMember = "name";
            comboBox1.SelectedIndexChanged += comboBox1_SelectedIndexChanged;
        }

Fill the combobox with Klasselements:

        private void Form1_Load(object sender, EventArgs e)
        {
            BindingList<Klass> klassList = new BindingList<Klass>(Util.CreateMockupData());
            comboBox1.DataSource = klassList;
        }

Implement handler to the combobox to set the datasource of the datagridview:

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            var selectedKlass = comboBox1.SelectedItem as Klass;
            if (selectedKlass != null)
            {
                dataGridView1.DataSource = selectedKlass.students;
            }
        }

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