Add comboBox items from code behind. [WPF]

Question

I grabbed this code from MSDN. What Im trying to do is similar, but use a list instead of three different strings. so say

List<string> strList = new List<string>();
strList.Add("Created with C#");
strList.Add("Item 2");
strList.Add("Item 3");

  //MSDN CODE BELOW
    cbox = new ComboBox();
        cbox.Background = Brushes.LightBlue;
        cboxitem = new ComboBoxItem();
        cboxitem.Content = "Created with C#";
        cbox.Items.Add(cboxitem);
        cboxitem2 = new ComboBoxItem();
        cboxitem2.Content = "Item 2";
        cbox.Items.Add(cboxitem2);
        cboxitem3 = new ComboBoxItem();
        cboxitem3.Content = "Item 3";
        cbox.Items.Add(cboxitem3);

        cv2.Children.Add(cbox);

Tried to do cbox.Items.Add(strList); Also tried a forloop to loop through each element, but that doesn't work either. Any ideas how I can achieve this?

XAML:

          <Grid x:Name="grid44" DataContext="{StaticResource tBLPERMITSViewSource}" HorizontalAlignment="Left" VerticalAlignment="Top" Width="409">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="Auto"/>
                                <ColumnDefinition Width="Auto"/>
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto"/>
                            </Grid.RowDefinitions>
                            <Label Content="SPR PACKET ASSIGMENT" Grid.Column="0" HorizontalAlignment="Left" Margin="3" Grid.Row="0" VerticalAlignment="Center" FontWeight="Bold"/>
                            <ComboBox x:Name="sPR_ASSIGNEDComboBox" Grid.Column="1" DisplayMemberPath="SPR_ASSIGNED" HorizontalAlignment="Left" Height="Auto" Text="{Binding SPR_ASSIGNED}" ItemsSource="{Binding Items}" Margin="3,5,-114.35,5" Grid.Row="0" VerticalAlignment="Center" Width="238.35" Background="White" IsReadOnly="True" IsEditable="True" >

                            </ComboBox>
                        </Grid>

Have you tried setting the .ItemsSource property of the combobox to a list of strings? e.g cbox.ItemsSource = new list<string>{"item1", "item2", "item3"}; — User92
– User92, Commented Jul 22, 2015 at 11:46
I have, it shows up blank. but with the right amount of items in the list though. Not sure whats happening. — Gisiota
– Gisiota, Commented Jul 22, 2015 at 15:25
So if I add say five items to a list, under the combobox ill see five empty slots. Ill add an image so you see what I mean. (in the image: "bro" is brought from the property of the xaml text="{binding field"}". Ill also add the xaml to make things more clear.) the content of combobox is brought from the list, but its not showing the string text. — Gisiota
– Gisiota, Commented Jul 22, 2015 at 15:37
Is it a standard WPF combobox, or you have you edited the template for it? — User92
– User92, Commented Jul 22, 2015 at 15:38

User92 · Accepted Answer · 2015-07-22 15:56:45Z

9

Set the items programmatically:

Code-behind:

    private void PopulateComboBox()
    {
        cBox.ItemsSource = new List<string> { "Item1", "Item2", "Item3"};
    }

XAML:

<ComboBox Width="200" Height="30"  x:Name="cBox" />

Bind to a collection of items:

    public class DummyClass
    {
        public int Value { get; set; }
        public string DisplayValue { get; set;}
    }

    public ObservableCollection<DummyClass> DummyClassCollection
    {
        get
        {
            return new ObservableCollection<DummyClass>
            {
                new DummyClass{DisplayValue = "Item1", Value = 1},
                new DummyClass{DisplayValue = "Item2", Value = 2},
                new DummyClass{DisplayValue = "Item3", Value = 3},
                new DummyClass{DisplayValue = "Item4", Value = 4},
            };
        }
    }

XAML:

<ComboBox Width="200" Height="30"  x:Name="cBox" ItemsSource="{Binding DummyClassCollection}" DisplayMemberPath="DisplayValue" />

answered Jul 22, 2015 at 15:56

User92

3261 silver badge6 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

User92 Over a year ago

It's worth noting that a list could've been used for the collection since it is returning the same data whenever the get is accessed, but I used an observable collection out of pure habit, which has built in notification of the collection changing, so the combox would be updated were the collection it is bound to change.

Daniel · Accepted Answer · 2020-04-02 02:21:11Z

3

If you don't want to do this following a binding/mvvm pattern, it is quite simple to just do the following:

foreach (var item in items)
{
    _comboBox.Items.Add(item);
    _comboBox.SelectedValuePath = "ID";
    _comboBox.DisplayMemberPath = "Name";
}

Which can be accessed later like so:

var id = _comboBox.SelectedValue;

answered Apr 2, 2020 at 2:21

Daniel

11.1k22 gold badges90 silver badges120 bronze badges

Comments

Community · Accepted Answer · 2017-05-23 11:44:10Z

0

You can use data binding. Data binding allows you to bind the dynamic data from your list to the combobox and have it generated and filled with the content you are passing through.

Binding WPF Combobox to a Custom List

edited May 23, 2017 at 11:44

CommunityBot

11 silver badge

answered Jul 22, 2015 at 11:58

CalusV

12 bronze badges

Comments

benjil · Accepted Answer · 2021-08-04 12:32:08Z

I solved Add and Remove ComboBox items from code behind simply by synchronization of my dictionary Ienumerable Keys with the ComboBox ItemsSource property, and then making a Refresh() of Items property when adding or removing items:

Dictionary<string,Object> dico=new Dictionary<string,Object>();
dico.Add("obj1",obj1);
dico.Add("obj2",obj2);
dico.Add("obj3",obj3);
...
ComboBox combobox=new ComboBox();
combobox.ItemsSource=dico.Keys;

string key=a_key;
Object obj=an_object;
// add //
if (dico.ContainsKey(key)==false)
{
    dico.Add(key,obj);
    combobox.Items.Refresh();
    combobox.SelectedItem=key;
}
// remove //
if (dico.ContainsKey(key)==true)
{
    dico.Remove(key);
    combobox.Items.Refresh();
}

Collectives™ on Stack Overflow

Add comboBox items from code behind. [WPF]

4 Answers 4

1 Comment

Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

1 Comment

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related