CODEWITHSUNDEEP
c#wpflistviewlistviewitem
Welsh King
Welsh King

Reputation: 3238

Change the background color of a ListViewItem on populate

this is tearing my hair out,

I have a listview

<ListView Canvas.Left="1045"  Canvas.Top="667"  FontSize="25" ItemsSource="{Binding Items}"   FontFamily="Gill Sans MT" Height="173" Name="lvContact" Width="536" SelectionChanged="lvContact_SelectionChanged">

In my code behind im dynamically adding an item to the list

public void UpdateContactList(Hashtable contactList)
{
    this.lvContact.Items.Clear();

    SortedDictionary<string,string> sortedContactList = new SortedDictionary<string,string>();


    foreach (DictionaryEntry de in contactList)
    {
        sortedContactList.Add(de.Key.ToString(), de.Value.ToString());
    }


    foreach (var de in sortedContactList)
    {
        System.Windows.Controls.ListViewItem contactItem = new System.Windows.Controls.ListViewItem();
        string contactItemString = de.Key.ToString();

        System.Windows.Controls.ListViewItem text = new System.Windows.Controls.ListViewItem();

        text.Content = contactItemString;
        if (de.Value == "NLN")
        {
            text.Background = Brushes.Green;
        }
        else
        {
            text.Background = Brushes.Gray;
        }
        lvContact.Items.Add(text);
    }
}

However the background color never changes and the list doesnt update.

Any ideas why ? Many thanks

Upvotes: 0

Views: 1693

Answers (1)

Rachel
Rachel

Reputation: 132658

ListViews can either be bound to an ItemsSource, or you can specify the ListView.Items manually. You cannot have both.

Your ListView definition binds your ListView.ItemsSource, so you cannot manually specify ListView.Items.

Since your ItemsSource is bound to a property Items, then I would assume you have a List<T> or ObservableCollection<T> somewhere called Items with the items for your ListView. To modify the ListView's Items, you should be modifying this collection.

To change the Background color based on a value, I would use a DataTrigger. This will allow you to keep your ItemsSource bindnig, and keeps your data separated from your UI.

<Style TargetType="{x:Type ListViewItem}">
    <Setter Property="Background" Value="Gray" />
    <Style.Triggers>
        <DataTrigger Binding="{Binding Value}" Value="NLN">
            <Setter Property="Background" Value="Green" />
        </DataTriggers>
    </Style.Triggers>
</Style>

Upvotes: 1

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