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c#wpfvisual-studioxaml

List Box Controls in Visual Studio to Auto-scroll

I am working on a WPF main window and I am using a list box, and I want the list box to auto-scroll whenever new data is added. I used the ListBoxBehavior class in the chosen answer for this question, and I added the following namespaces for the that class in my code:

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Windows;
using System.Windows.Controls;
using System.ComponentModel;

Also, in my XAML, I added the following:

<ListBox x:Name="IncomingData" FontSize="20" Grid.Column="1" Margin="10,10,10,0" Grid.Row="3" ItemsSource="{Binding SourceCollection}" lb:ListBoxBehavior.ScrollOnNewItem="true"/>

However, I am getting the following three errors in my XAML code regarding that line, and they are as following:

  1. Error XDG0006 The namespace prefix "lb" is not defined.
  2. Error XDG0008 ListBoxBehavior is not supported in a Windows Presentation Foundation (WPF) project.
  3. Error XLS0415 The attachable property 'ScrollOnNewItem' was not found in type 'ListBoxBehavior'.

I tried creating an object of a ListBox type ListBox lb = new ListBox(); in the ListBoxBehavior class, but that didn't change the situation. Also, ScrollOnNewItem already exists in the class, so why is it not identifying it? Is there a missing step that I should have done? Any help is much appreciated!

Solution

  • you need to define the lb namespace before using it.

    at the top of your xaml file you ought to see xmlns:x="...". notice you are using it with x:Name.

    same goes for lb. you need to define xmlns:lb="...". intellisense should help you fill in the "...".

    notice xmlns means xml namespace.

    that ought to clear up all 3 errors.