ComboBox Adding Text and Value to an Item no Binding Source

Question

In C  WinApp  how can I add both Text and Value to the items of my ComboBox  I did a search and usually the answers are using  Binding to a source    but in my case I do not have a binding source ready in my program    How can I do something like this   combo1 Item 1     DisplayText   combo1 Item 1  Value    useful Value

User · Answer

An example using DataTable   DataTable dtblDataSource   new DataTable    dtblDataSource Columns Add  DisplayMember    dtblDataSource Columns Add  ValueMember    dtblDataSource Columns Add  AdditionalInfo     dtblDataSource Rows Add  Item 1   1   something useful 1    dtblDataSource Rows Add  Item 2   2   something useful 2    dtblDataSource Rows Add  Item 3   3   something useful 3     combo1 Items Clear    combo1 DataSource   dtblDataSource  combo1 DisplayMember    DisplayMember   combo1 ValueMember    ValueMember         Get additional info    foreach  DataRowView drv in combo1 Items                string strAdditionalInfo   drv  AdditionalInfo   ToString               Get additional info for selected item     string strAdditionalInfo    combo1 SelectedItem as DataRowView   AdditionalInfo   ToString          Get selected value    string strSelectedValue   combo1 SelectedValue ToString

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I liked fab s answer but didn t want to use a dictionary for my situation so I substituted a list of tuples      set up your data public static List lt Tuple lt string  string gt  gt  List   new List lt Tuple lt string  string gt  gt      new Tuple lt string  string gt   Item1    Item2         bind to the combo box comboBox DataSource   new BindingSource List  null   comboBox ValueMember    Item1   comboBox DisplayMember    Item2      Get selected value string value     Tuple lt string  string gt  queryList SelectedItem  Item1

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Don t know if this will work for the situation given in the original post  never mind the fact that this is two years later   but this example works for me   Hashtable htImageTypes   new Hashtable    htImageTypes Add  JPEG      jpg    htImageTypes Add  GIF      gif    htImageTypes Add  BMP      bmp     foreach  DictionaryEntry ImageType in htImageTypes        cmbImageType Items Add ImageType     cmbImageType DisplayMember    key   cmbImageType ValueMember    value     To read your value back out  you ll have to cast the SelectedItem property to a DictionaryEntry object  and you can then evaluate the Key and Value properties of that   For instance   DictionaryEntry deImgType    DictionaryEntry cmbImageType SelectedItem  MessageBox Show deImgType Key          deImgType Value

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You can use this code to insert some items into a combo box with text and value   C   private void ComboBox SelectionChanged 1 object sender  SelectionChangedEventArgs e        combox Items Insert 0   Copenhagen        combox Items Insert 1   Tokyo        combox Items Insert 2   Japan        combox Items Insert 0   India           XAML   lt ComboBox x Name  combox  SelectionChanged  ComboBox SelectionChanged 1   gt

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Bind combobox to dictionary Dictionary lt string  string gt test   new Dictionary lt string  string gt             test Add  1    dfdfdf            test Add  2    dfdfdf            test Add  3    dfdfdf            comboBox1 DataSource   new BindingSource test  null           comboBox1 DisplayMember    Value           comboBox1 ValueMember    Key       Get combobox selection  in handler  string value     KeyValuePair lt string  string gt  comboBox1 SelectedItem  Value

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You can use Dictionary Object instead of creating a custom class for adding text and value in a Combobox   Add keys and values in a Dictionary Object   Dictionary lt string  string gt  comboSource   new Dictionary lt string  string gt     comboSource Add  1    Sunday    comboSource Add  2    Monday      Bind the source Dictionary object to Combobox   comboBox1 DataSource   new BindingSource comboSource  null   comboBox1 DisplayMember    Value   comboBox1 ValueMember    Key     Retrieve Key and value   string key     KeyValuePair lt string string gt  comboBox1 SelectedItem  Key  string value     KeyValuePair lt string string gt  comboBox1 SelectedItem  Value    Full Source   Combobox Text nd Value

User · Answer

You should use dynamic object to resolve combobox item in run-time   comboBox DisplayMember    Text   comboBox ValueMember    Value    comboBox Items Add new   Text    Text   Value    Value        comboBox SelectedItem as dynamic  Value

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This is a very simple solution for windows forms if all is needed is the final value as a  string   The items  names will be displayed on the Combo Box and the selected value can be easily compared    List lt string gt  items   new List lt string gt         populate list with test strings for  int i   0  i  lt  100  i                items Add i ToString         set data source testComboBox DataSource   items    and on the event handler get the value  string  of the selected value  string test   testComboBox SelectedValue ToString

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If anyone is still interested in this  here is a simple and flexible class for a combobox item with a text and a value of any type  very similar to Adam Markowitz s example    public class ComboBoxItem lt T gt        public string Name      public T value   default T        public ComboBoxItem string Name  T value                this Name   Name          this value   value             public override string ToString                 return Name            Using the  lt T gt  is better than declaring the value as an object  because with object you d then have to keep track of the type you used for each item  and cast it in your code to use it properly   I ve been using it on my projects for quite a while now  It is really handy

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I had the same problem  what I did was add a new ComboBox with just the value in the same index then the first one  and then when I change the principal combo the index in the second one change at same time  then I take the value of the second combo and use it   This is the code   public Form1         eventos   cliente GetEventsTypes usuario        foreach  EventNo no in eventos                cboEventos Items Add no eventno ToString      --   no description ToString             cboEventos2 Items Add no eventno ToString              private void lista SelectedIndexChanged object sender  EventArgs e        lista2 Items Add lista SelectedItem ToString        private void cboEventos SelectedIndexChanged object sender  EventArgs e        cboEventos2 SelectedIndex   cboEventos SelectedIndex

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Further to Adam Markowitz s answer  here is a general purpose way of  relatively  simply setting the ItemSource values of a combobox to be enums  while showing the  Description  attribute to the user   You d think everyone would want to do this so that it would be a  NET one liner  but it just isn t  and this is the most elegant way I ve found    First  create this simple class for converting any Enum value into a ComboBox item   public class ComboEnumItem       public string Text   get  set        public object Value   get  set         public ComboEnumItem Enum originalEnum                this Value   originalEnum          this Text   this ToString               public string ToString                 FieldInfo field   Value GetType   GetField Value ToString             DescriptionAttribute attribute   Attribute GetCustomAttribute field  typeof DescriptionAttribute   as DescriptionAttribute          return attribute    null   Value ToString     attribute Description            Secondly in your OnLoad event handler  you need to set the source of your combo box to be a list of ComboEnumItems based on every Enum in your Enum type  This can be achieved with Linq  Then just set the DisplayMemberPath       void OnLoad object sender  RoutedEventArgs e                comboBoxUserReadable ItemsSource   Enum GetValues typeof EMyEnum                            Cast lt EMyEnum gt                             Select v   gt  new ComboEnumItem v                            ToList             comboBoxUserReadable DisplayMemberPath    Text           comboBoxUserReadable SelectedValuePath   Value           Now the user will select from a list of your user friendly Descriptions  but what they select will be the enum value which you can use in code  To access the user s selection in code  comboBoxUserReadable SelectedItem will be the ComboEnumItem and comboBoxUserReadable SelectedValue will be the EMyEnum

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You must create your own class type and override the ToString   method to return the text you want   Here is a simple example of a class you can use   public class ComboboxItem       public string Text   get  set        public object Value   get  set         public override string ToString                 return Text            The following is a simple example of its usage   private void Test         ComboboxItem item   new ComboboxItem        item Text    Item text1       item Value   12       comboBox1 Items Add item        comboBox1 SelectedIndex   0       MessageBox Show  comboBox1 SelectedItem as ComboboxItem  Value ToString

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This is one of the ways that just came to mind    combo1 Items Add new ListItem  Text    Value     And to change text of or value of an item  you can do it like this   combo1 Items 0  Text    new Text    combo1 Items 0  Value    new Value     There is no class called ListItem in Windows Forms  It only exists in ASP NET  so you will need to write your own class before using it  the same as  Adam Markowitz did in his answer     Also check these pages  they may help      How add an item to a combobox How to  Add and Remove Items from a Windows Forms ComboBox  ListBox  or CheckedListBox Control

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set  comboBox1 DisplayMember    Value      to add  comboBox1 Items Add new KeyValuePair  2    This text is displayed        to access the  tag  property  string tag     KeyValuePair lt  string  string  gt  comboBox1 SelectedItem  Key   MessageBox Show tag

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This is how Visual Studio 2013 does it   Single item   comboBox1- gt Items- gt AddRange gcnew cli  array lt  System  Object    gt  1    L Combo Item 1        Multiple Items   comboBox1- gt Items- gt AddRange gcnew cli  array lt  System  Object    gt  3        L Combo Item 1       L Combo Item 2       L Combo Item 3        No need to do class overrides or include anything else  And yes the comboBox1- gt SelectedItem and comboBox1- gt SelectedIndex calls still work

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Class creat   namespace WindowsFormsApplication1       class select               public string Text   get  set            public string Value   get  set              Form1 Codes   namespace WindowsFormsApplication1       public partial class Form1   Form               public Form1                         InitializeComponent                List lt select gt  sl   new List lt select gt                 sl Add new select     Text       Value                      sl Add new select     Text    AAA   Value    aa                  sl Add new select     Text    BBB   Value    bb                  comboBox1 DataSource   sl              comboBox1 DisplayMember    Text                      private void comboBox1 SelectedIndexChanged object sender  EventArgs e                         select sl1   comboBox1 SelectedItem as select              t1 Text   Convert ToString sl1 Value

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Better solution here   Dictionary lt int  string gt  userListDictionary   new Dictionary lt int  string gt             foreach  var user in users                        userListDictionary Add user Id user Name                      cmbUser DataSource   new BindingSource userListDictionary  null           cmbUser DisplayMember    Value           cmbUser ValueMember    Key     Retreive Data  MessageBox Show cmbUser SelectedValue ToString

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You can use anonymous class like this   comboBox DisplayMember    Text   comboBox ValueMember    Value    comboBox Items Add new   Text    report A   Value    reportA      comboBox Items Add new   Text    report B   Value    reportB      comboBox Items Add new   Text    report C   Value    reportC      comboBox Items Add new   Text    report D   Value    reportD      comboBox Items Add new   Text    report E   Value    reportE        UPDATE  Although above code will properly display in combo box  you will not be able to use SelectedValue or SelectedText properties of ComboBox  To be able to use those  bind combo box as below   comboBox DisplayMember    Text   comboBox ValueMember    Value    var items   new          new   Text    report A   Value    reportA          new   Text    report B   Value    reportB          new   Text    report C   Value    reportC         new   Text    report D   Value    reportD         new   Text    report E   Value    reportE        comboBox DataSource   items

User · Answer

You may use a generic Type   public class ComboBoxItem lt T gt        private string Text   get  set        public T Value   get  set         public override string ToString                 return Text             public ComboBoxItem string text  T value                Text   text          Value   value            Example of using a simple int-Type   private void Fill ComboBox comboBox                comboBox Items Clear            object   list                                 new ComboBoxItem lt int gt   Architekt   1                   new ComboBoxItem lt int gt   Bautr  ger   2                   new ComboBoxItem lt int gt   Fachbetrieb Installateur   3                   new ComboBoxItem lt int gt   GC-Haus   5                   new ComboBoxItem lt int gt   Ingenieur- Planungsb  ro   9                   new ComboBoxItem lt int gt   Wowi   17                   new ComboBoxItem lt int gt   Endverbraucher   19                          comboBox Items AddRange list

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This is similar to some of the other answers  but is compact and avoids the conversion to dictionary if you already have a list   Given a ComboBox  combobox  on a windows form and a class SomeClass with the string type property Name   List lt SomeClass gt  list   new List lt SomeClass gt      combobox DisplayMember    Name   combobox DataSource   list    Which means that the SelectedItem is a SomeClass object from list  and each item in combobox will be displayed using its name

[c#] ComboBox: Adding Text and Value to an Item (no Binding Source)

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