C# ComboBox SelectedItem not Updating

My problem is that after I select a item in the ComboBox, the first item or "default" item of the combobox stays empty but if I click the combobox the values beneath show up are selectable etc. but I want the clicked one to show in the "default/first" place.

What I tried so far

XAML:

<ComboBox Margin="55,0,0,10" Height="20" Width="145" VerticalAlignment="Center" HorizontalAlignment="Left"
ItemsSource="Binding TabItems, Source=StaticResource MainWindowViewModelRefactored, Mode=TwoWay"
SelectedItem="Binding SelectedItem, Source=StaticResource MainWindowViewModelRefactored, Mode=TwoWay"
DisplayMemberPath="Header">
</ComboBox>


Property:

public TabItem SelectedItem
get
return _selectedItem;

set
UpdateTCVCollection(value);
_selectedItem = value;
NotifyPropertyChanged("SelectedItem");




If I open up the combobox the selecteditem is highlighted, but I also want it to be shown in the "first place" when the ComboBox is closed.

2 Answers
2

You can add a method when the index has changed, then remove the item that the user selected and add it at the begining.

I've set the value of Sorted to false because that way the value you selected won't be reorganized in your ComboBox.

Sorted

false

private void ComboBox1_SelectedIndexChanged(object sender, EventArgs e)
RadItem selectedItem = ComboBox1.SelectedItem as RadItem;

if (selectedItem != null)
ComboBox1.Items.Remove(selectedItem);
ComboBox1.Items.Sorted = true;
ComboBox1.Items.Sorted = false;
ComboBox1.Items.Insert(0, selectedItem);
ComboBox1.Text = selectedItem.Text;




Add the UpdateSourceTrigger to your Combobox.

UpdateSourceTrigger=PropertyChanged


Example:

<ComboBox Margin="55,0,0,10" Height="20" Width="145" VerticalAlignment="Center" HorizontalAlignment="Left"
ItemsSource="Binding TabItems, Source=StaticResource MainWindowViewModelRefactored, Mode=TwoWay"
SelectedItem="Binding SelectedItem, Source=StaticResource MainWindowViewModelRefactored, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged"
DisplayMemberPath="Header">
</ComboBox>


Have a look to this MSDN link

That should help you with your problem.

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