How to bind a List to a ComboBox

Question

I want to connect a BindingSource to a list of class objects and then objects value to a ComboBox  Can anyone suggest how to do it   public class Country       public string Name   get  set        public IList lt City gt  Cities   get  set         public Country                 Cities   new List lt City gt               is my class and I want to bind its name field to a BindingSource which could be then associated with a ComboBox

User · Answer

public MainWindow        List lt person gt  personList   new List lt person gt          personList Add new person   name    rob   age   32          personList Add new person   name    annie   age   24          personList Add new person   name    paul   age   19           comboBox1 DataSource   personList      comboBox1 DisplayMember    name        comboBox1 SelectionChanged    new SelectionChangedEventHandler comboBox1 SelectionChanged       void comboBox1 SelectionChanged object sender  SelectionChangedEventArgs e        person selectedPerson   comboBox1 SelectedItem as person      messageBox Show selectedPerson name   caption goes here        boom

User · Answer

As you are referring to a combobox  I m assuming you don t want to use 2-way databinding  if so  look at using a BindingList   public class Country       public string Name   get  set        public IList lt City gt  Cities   get  set        public Country string  name                Cities   new List lt City gt             Name    name              List lt Country gt  countries   new List lt Country gt    new Country  UK                                          new Country  Australia                                          new Country  France       var bindingSource1   new BindingSource    bindingSource1 DataSource   countries   comboBox1 DataSource   bindingSource1 DataSource   comboBox1 DisplayMember    Name   comboBox1 ValueMember    Name     To find the country selected in the bound combobox  you would do something like  Country country    Country comboBox1 SelectedItem    If you want the ComboBox to dynamically update you ll need to make sure that the data structure that you have set as the DataSource implements IBindingList  one such structure is BindingList lt T gt      Tip  make sure that you are binding the DisplayMember to a Property on the class and not a public field  If you class uses public string Name   get  set    it will work but if it uses public string Name  it will not be able to access the value and instead will display the object type for each line in the combo box

User · Answer

If you are using a ToolStripComboBox there is no DataSource exposed   NET 4 0    List lt string gt  someList   new List lt string gt     someList Add  value    someList Add  value    someList Add  value     toolStripComboBox1 Items AddRange someList ToArray

User · Answer

public class Country       public string Name   get  set        public IList lt City gt  Cities   get  set         public Country                 Cities   new List lt City gt              public class City        public string Name   get  set        List lt Country gt  Countries   new List lt Country gt        new Country               Name    Germany           Cities                         new City  Name    Berlin                new City  Name    Hamburg                        new Country               Name    England           Cities                         new City  Name    London                new City  Name    Birmingham                      bindingSource1 DataSource   Countries  member CountryComboBox DataSource   bindingSource1 DataSource  member CountryComboBox DisplayMember    Name   member CountryCombo  Box ValueMember    Name     This is the code I am using now

User · Answer

For a backgrounder  there are 2 ways to use a ComboBox ListBox  1  Add Country Objects to the Items property and retrieve a Country as Selecteditem  To use this you should override the ToString of Country   2  Use DataBinding  set the DataSource to a IList  List lt    and use DisplayMember  ValueMember and SelectedValue  For 2  you will need a list of countries first      not tested  schematic  List lt Country gt  countries                fill   comboBox1 DataSource   countries  comboBox1 DisplayMember  Name   comboBox1 ValueMember  Cities     And then in the SelectionChanged   if  comboBox1 Selecteditem    null       comboBox2 DataSource comboBox1 SelectedValue

User · Answer

Try something like this   yourControl DataSource   countryInstance Cities    And if you are using WebForms you will need to add this line   yourControl DataBind

[c#] How to bind a List to a ComboBox?

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