How to set the Highlight brush to random color

Question

I have this code below that sets the color to random, how to set the selected Listbox item to random??

private void button_Click(object sender, RoutedEventArgs e)
{
Brush brush = new SolidColorBrush(Color.FromRgb((byte)r.Next(1, 255),
(byte)r.Next(1, 255), (byte)r.Next(1, 233)));
label1.Background = brush;
}

Answer 1

Welcome to our Microsoft Q&A platform!

I made a demo,you can try it:

 <Window.Resources>  
        <Style x:Key="_ListBoxItemStyle" TargetType="ListBoxItem">  
            <Setter Property="Template">  
                <Setter.Value>  
                    <ControlTemplate TargetType="ListBoxItem">  
                        <Border Name="_Border"  
                                Padding="2"  
                                SnapsToDevicePixels="true">  
                            <ContentPresenter />  
                        </Border>  
                        <ControlTemplate.Triggers>  
                            <Trigger Property="IsSelected" Value="true">  
                                <Setter TargetName="_Border" Property="Background" Value="{Binding Scb}"/>  
                                 
                            </Trigger>  
                        </ControlTemplate.Triggers>  
                    </ControlTemplate>  
                </Setter.Value>  
            </Setter>  
        </Style>  
    </Window.Resources>  
    <StackPanel>  
        <ListBox SelectionChanged="ListBox1_SelectionChanged" Name="listBox1"  ItemContainerStyle="{DynamicResource _ListBoxItemStyle}" ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.HorizontalScrollBarVisibility="Auto">  
            <ListBoxItem>1</ListBoxItem>  
            <ListBoxItem>2</ListBoxItem>  
            <ListBoxItem>3</ListBoxItem>  
         
        </ListBox>  
    </StackPanel>  

  public partial class MainWindow : Window  
    {  
        public MainWindow()  
        {  
            InitializeComponent();  
            this.DataContext = new MyViewModel();  
        }  
  
        private void ListBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)  
        {  
            this.DataContext = new MyViewModel();  
        }  
  
    }  
  
    public class MyViewModel : INotifyPropertyChanged  
    {  
        public event PropertyChangedEventHandler PropertyChanged;  
  
        Random r = new Random();  
        private SolidColorBrush _scb = new SolidColorBrush();  
        public SolidColorBrush Scb  
        {  
            get { return _scb; }  
            set { _scb = value; PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Scb")); }  
        }  
        public MyViewModel()  
        {  
            Scb= new SolidColorBrush(Color.FromRgb((byte)r.Next(1, 255), (byte)r.Next(1, 255), (byte)r.Next(1, 233)));  
  
        }  
    }  

Thanks.