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POC# databinding on combobox
 

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  1. POC# databinding on combobox
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    <p>I can't understand the following 2 issues given this code. I mapped a combobox to a custom object and I want each time that the selected value change on the combobox, the custom object changes too.</p> <pre><code>public partial class MainForm : Form { private Person _person; public MainForm() { InitializeComponent(); _person = new Person(); //Populating the combox, we have this.comboBoxCities.DataSource = this.cityBindingSource; cityBindingSource.Add(new City("London")); cityBindingSource.Add(new City("Paris")); _person.BirthCity = new City("Roma"); cityBindingSource.Add(_person.BirthCity); cityBindingSource.Add(new City("Madrid")); //Doing the binding comboBoxCities.DataBindings.Add("SelectedItem", _person, "BirthCity"); } private void buttonDisplay_Click(object sender, EventArgs e) { MessageBox.Show("BirthCity=" + _person.BirthCity.Name); } private int i = 0; private void buttonAddCity_Click(object sender, EventArgs e) { City city = new City("City n°" + i++); cityBindingSource.Add(city); comboBoxCities.SelectedItem = city; } } public class Person { private City _birthCity; public City BirthCity { get { return _birthCity; } set { Console.WriteLine("Setting birthcity : " + value.Name); _birthCity = value; } } } public class City { public string Name { get; set; } public City(string name) { Name = name; } public override string ToString() { return Name; } } </code></pre> <p>1 - why when I manually select twice in a row (or more) different value on the combobox, I got only one call to BirthCity.Set witht he last selected value (and the call seems firing only when the combobox lost the focus) ?</p> <p>2 - why when I click buttonAddCity and then buttonDisplay, the diplayed city is not the one selected (not the one displayed in the comobox )</p>
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