Add items to comboBox in WPF

Question

When I have added a comboBox to the WPF window  how do I add items to the comboBox  Int the XAML code for the design or in NameOfWindow xaml cs file

User · Answer

Its better to build ObservableCollection and take advantage of it

public ObservableCollection<string> list = new ObservableCollection<string>();
list.Add("a");
list.Add("b");
list.Add("c");
this.cbx.ItemsSource = list;

cbx is comobobox name

Also Read : Difference between List, ObservableCollection and INotifyPropertyChanged

User · Answer

Scenario 1 - you don t have a data-source for the items You can just populate the ComboBox with static values as follows - From XAML   lt ComboBox Height  quot 23 quot  Name  quot comboBox1 quot  Width  quot 120 quot  gt           lt ComboBoxItem Content  quot X quot   gt           lt ComboBoxItem Content  quot Y quot   gt           lt ComboBoxItem Content  quot Z quot   gt   lt  ComboBox gt     Or  from CodeBehind  private void Window Loaded object sender  RoutedEventArgs e        comboBox1 Items Add  quot X quot        comboBox1 Items Add  quot Y quot        comboBox1 Items Add  quot Z quot         Scenario 2 a - you have a data-source  and the items never get changed You can use the data-source to populate the ComboBox  Any IEnumerable type can be used as the data-source  You need to assign it to the ItemsSource property of the ComboBox and that ll do just fine  it s up to you how you populate the IEnumerable   Scenario 2 b - you have a data-source  and the items might get changed You should use an ObservableCollection lt T gt  as the data-source and assign it to the ItemsSource property of the ComboBox  it s up to you how you populate the ObservableCollection lt T gt    Using an ObservableCollection lt T gt  ensures that whenever an item is added to or removed from the data-source  the change will reflect immediately on the UI

User · Answer

Use this  string   str   new string     Foo    Bar     myComboBox ItemsSource   str  myComboBox SelectedIndex   0    OR  foreach  string s in str      myComboBox Items Add s    myComboBox SelectedIndex   0

User · Answer

You can fill it from XAML or from  cs  There are few ways to fill controls with data  It would be best for You to read more about WPF technology  it allows to do many things in many ways  depending on Your needs  It s more important to choose method based on Your project needs  You can start here  It s an easy article about creating combobox  and filling it with some data

User · Answer

I think comboBox1 Items Add  X    will add string to ComboBox  instead of ComboBoxItem   The right solution is   ComboBoxItem item   new ComboBoxItem    item Content    A   comboBox1 Items Add item

User · Answer

There are many ways to perform this task  Here is a simple one    lt Window x Class  WPF Demo1 MainWindow      xmlns  http   schemas microsoft com winfx 2006 xaml presentation      xmlns x  http   schemas microsoft com winfx 2006 xaml       x Name  TestWindow      Title  MainWindow  Height  500  Width  773  gt    lt DockPanel LastChildFill  False  gt       lt StackPanel DockPanel Dock  Top  Background  Red  Margin  2  gt           lt StackPanel Orientation  Horizontal  x Name  spTopNav  gt               lt ComboBox x Name  cboBox1  MinWidth  120  gt   lt  -- Notice we have used x Name to identify the object that we want to operate upon -- gt               lt  --                  lt ComboBoxItem Content  X   gt                   lt ComboBoxItem Content  Y   gt                   lt ComboBoxItem Content  Z   gt              -- gt               lt  ComboBox gt           lt  StackPanel gt       lt  StackPanel gt       lt StackPanel DockPanel Dock  Bottom  Background  Orange  Margin  2  gt           lt StackPanel Orientation  Horizontal  x Name  spBottomNav  gt           lt  StackPanel gt           lt TextBlock Height  30  Foreground  White  gt Left Docked StackPanel 2 lt  TextBlock gt       lt  StackPanel gt       lt StackPanel MinWidth  200  DockPanel Dock  Left  Background  Teal  Margin  2  x Name  StackPanelLeft  gt           lt TextBlock  Foreground  White  gt Bottom Docked StackPanel Left lt  TextBlock gt        lt  StackPanel gt       lt StackPanel DockPanel Dock  Right  Background  Yellow  MinWidth  150  Margin  2  x Name  StackPanelRight  gt  lt  StackPanel gt       lt Button Content  Button  Height  410  VerticalAlignment  Top  Width  75  x Name  myButton  Click  myButton Click   gt     lt  DockPanel gt    lt  Window gt          Next  we have the C  code       private void myButton Click object sender  RoutedEventArgs e                ComboBoxItem cboBoxItem   new ComboBoxItem       Create example instance of our desired type          Type type1   cboBoxItem GetType            object cboBoxItemInstance   Activator CreateInstance type1      Construct an instance of that type          for  int i   0  i  lt  12  i                          string newName    stringExample    i ToString                  Generate the objects from our list of strings              ComboBoxItem item   this CreateComboBoxItem  ComboBoxItem cboBoxItemInstance   nameExample     newName  newName               cboBox1 Items Add item      Add each newly constructed item to our NAMED combobox                      private ComboBoxItem CreateComboBoxItem ComboBoxItem myCbo  string content  string name                Type type1   myCbo GetType            ComboBoxItem instance    ComboBoxItem Activator CreateInstance type1              Here  we re using reflection to get and set the properties of the type          PropertyInfo Content   instance GetType   GetProperty  Content   BindingFlags Public   BindingFlags Instance           PropertyInfo Name   instance GetType   GetProperty  Name   BindingFlags Public   BindingFlags Instance           this SetProperty lt ComboBoxItem  String gt  Content  instance  content           this SetProperty lt ComboBoxItem  String gt  Name  instance  name            return instance            PropertyInfo prop   type GetProperties rb1           Note  This is using reflection  If you d like to learn more about the basics of reflection and why you might want to use it  this is a great introductory article    An Introduction to Reflection in  NET   If you d like to learn more about how you might use reflection with WPF specifically  here are some resources    Reflection for WPF Rockstars Use the Power of Reflection to Create and Manipulate Managed Objects   And if you want to massively speed up the performance of reflection  it s best to use IL to do that  like this    Fast version of the ActivatorCreateInstance method using IL Fast Dynamic Property and Field Accessors

User · Answer

With OleDBConnection -  connect to Oracle  OleDbConnection con   new OleDbConnection                con ConnectionString    Provider MSDAORA Data Source oracle Persist Security Info True User ID system Password            Unicode True                OleDbCommand comd1   new OleDbCommand  select name from table   con               OleDbDataReader DR   comd1 ExecuteReader                while  DR Read                                  comboBox delete Items Add DR 0                              con Close      That s all

[c#] Add items to comboBox in WPF

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