C# program crashes because listbox items change

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By : craig

Date : November 25 2020, 04:01 AM

fixed the issue. Will look into that further Check that listboxspelers.SelectedItem is not null before you call ToString(). You should also call the ToString() method just once since you pass the same value to all methods:

code :

private void Listboxspelers_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    //set player statistics
    if (listboxspelers != null && listboxspelers.SelectedItem != null)
    {
        string selectedItem = listboxspelers.SelectedItem.ToString();
        lblpositie.Content = "Positie: " + db.GetPositie(selectedItem);
        lbldoelpunten.Content = "Aantal Doelpunten: " + db.GetDoelpunten(selectedItem);
        lblgelekaarten.Content = "Aantal GeleKaarten: " + db.GetGeleKaarten(selectedItem);
        lblRodeKaarten.Content = "Aantal RodeKaarten: " + db.GetRodeKaarten(selectedItem);
    }
}

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WPF - Change one ListBox's Items order affect the other ListBox

By : user3304744

Date : March 29 2020, 07:55 AM

hope this fix your issue From MSDN:

Calling a new form clicking an item in listbox when the listbox items change

By : Jerry Thomas

Date : March 29 2020, 07:55 AM

it should still fix some issue Well,
Let's assume you are using arrays of strings to hold the listbox values.

code :

string[] category1;
string[] category2;

      private void yourComboBoxName_SelectedIndexChanged(object sender, 
    System.EventArgs e) 
{
          if (yourComboBoxName.text == "category1")
                 'populate listbox with that categories options
          elseif (yourComboxName.text == "category2")
                 'populate listbox with that categories options
          end if
 }

 private void yourButtonName_Click(object sender, System.EventArgs e)
{

           if (yourListBoxName.text == "option1")
                 'call form to show
          elseif (yourListBoxName.text == "option2")
                'call form to show
          end if
}

WPF ListBox not updating value of bound items when the items change

By : Sivachandran

Date : March 29 2020, 07:55 AM

Any of those help Apparently you are expecting that the ListBox automagically calls the Multimedia object's ToString() method whenever one if its properties changes. That's not the case.
Instead of relying on ToString, declare a proper ItemTemplate for the ListBox:

code :

<ListBox Name="mediaListBox" ItemsSource="{Binding MyData}" Grid.Row="0">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBlock>
                <Run Text="{Binding Title}"/>
                <Run Text="-"/>
                <Run Text="{Binding Artist}"/>
                <Run Text="["/><Run Text="{Binding Genre}"/><Run Text="]"/>
                <Run Text="{Binding Type}"/>
            </TextBlock>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

<TextBlock>
    <Run Text="{Binding Title}"/> - <Run Text="{Binding Artist}"/> [<Run Text="{Binding Genre}"/>] <Run Text="{Binding Type}"/>
</TextBlock>

WPF: Dynamically change ListBox's ItemTemplate based on ListBox Items Size

By : Benny Tandio

Date : March 29 2020, 07:55 AM

I wish this helpful for you you could use data triggers, or you could use a DataTemplateSelector Here is an article that shows the basics. and here is the MSDN on applying it to the items control (also, a listbox)