How to trigger SelectionChanged event when ComboBox selected Index is same not necessarily changed in WPF C#?

Question

Hi there, I have a simple WPF application where a different window will open if I select the last item of a Combo box. my code is working successfully but there some issue on my code. I want some more functionality. Suppose, I select the last item, A window will appear. if I select the last item again then the another window will not appear again, that only works if I select another item after that again the last item.

I want to open that different window again and again by selecting the last item it does not matter if I select the last item, last time or not.

Here is my C# code in MainWindow.xaml.cs :

 private void cmb1_SelectionChanged(object sender, SelectionChangedEventArgs e) {  
      
       Window1 win1 = new Window1();  
      
       if (cmb1.SelectedIndex == cmb1.Items.Count - 1)  
      
       {  
         win1.Show();  
      
       } else {  
      
         win1.Close();  
      
       }  
      
     }  

Here I also tried by putting cmb1.SelectedIndex = -1; after win1.Show();. It works but it behaves abnormally that means my ComboBox became blank which I obviously don't want.

Here is my XAML code :

<Grid x:Name="Grid">  
<ComboBox x:Name="cmb1" Width="400" Height="25" SelectionChanged="cmb1_SelectionChanged" >  
<ComboBoxItem >item1</ComboBoxItem>  
<ComboBoxItem>item2</ComboBoxItem>  
<ComboBoxItem>item3</ComboBoxItem>  
<ComboBoxItem>item4</ComboBoxItem>  
</ComboBox>  
</Grid>  

My final approach is to Create a proper ViewModel and use DataBinding with simple properties instead. But I don't know How to do that in this scenario.

Answer 1

I know it's late, but have you tried "ComboBox.SelectedItems.Clear"?

Answer 2

Using the MVVM code below can achieve the same effect as yours.

MainWindow.xaml:

 <Window.DataContext>  
        <local:ViewModel/>  
    </Window.DataContext>  
    <StackPanel x:Name="Grid">  
         
        <ComboBox Name="cb2" Width="400" Height="30" ItemsSource="{Binding List}"  
                  DisplayMemberPath="Name"  
            SelectedValuePath="Name"  
                  SelectedIndex="{Binding Selected}">  
             
        </ComboBox>  
    </StackPanel>  

Codebehind:
252381-4444.txt

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