How to sort two ListViews with the same source independently

Question

How to sort two ListViews with the same source independently

Marco Handl 21

Hello guys,

I need some help.

I have one singleton class who holds a ObservableCollection.
Then I have two Windows each has a ListView. The ItemsSource of the views is the ObservableCollection from the Singelton Class.
All will be shown and it works fine.

But, if I sort one ListView on Window A, the other ListView on Window B gets also sorted. Is there a way that I can separatly sort both ListViews without copying the initial collection?

here my initial linking:

//creating the singelton object  
acController = AcController.CreateInstance(m_UAClientHelperAPI);  
//Create the view  
view = (ListCollectionView)CollectionViewSource.GetDefaultView(acController.AlarmList);  
//Sort view  
view.SortDescriptions.Add(new SortDescription("Time", ListSortDirection.Ascending));  
view.Refresh();  
//connect view to ListView  
AlarmListView.ItemsSource = view;

here the main part of the sorting when I press a headerbutton:

        private void Sort(string sortBy, ListSortDirection direction) {  
            ICollectionView dataView =  
              CollectionViewSource.GetDefaultView(AlarmListView.ItemsSource);  
  
            dataView.SortDescriptions.Clear();  
            SortDescription sd = new SortDescription(sortBy, direction);  
            dataView.SortDescriptions.Add(sd);  
            dataView.Refresh();  
        }

Thanks in advance!

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Answer 1

Hi Marco,
you can use 2 different CollectionViewSources and sort each View (of CollectionViewSource) with other SortDescriptions like in following demo:

<Window x:Class="WpfApp1.Window025"  
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
        xmlns:local="clr-namespace:WpfApp025"  
        mc:Ignorable="d"  
        Title="MarcoHandl-3158_20220613" Height="450" Width="400">  
  <Window.DataContext>  
    <local:ViewModel/>  
  </Window.DataContext>  
  <StackPanel>  
    <ListView ItemsSource="{Binding View}" Height="200">  
      <ListView.View>  
        <GridView>  
          <GridViewColumn Header="ID" DisplayMemberBinding="{Binding Id}" Width="100"/>  
          <GridViewColumn Header="Time" DisplayMemberBinding="{Binding Time}" Width="200"/>  
        </GridView>  
      </ListView.View>  
    </ListView>  
    <ListView ItemsSource="{Binding DataView}" Height="200">  
      <ListView.View>  
        <GridView>  
          <GridViewColumn Header="ID" DisplayMemberBinding="{Binding Id}" Width="100"/>  
          <GridViewColumn Header="Time" DisplayMemberBinding="{Binding Time}" Width="200"/>  
        </GridView>  
      </ListView.View>  
    </ListView>  
  </StackPanel>  
</Window>

ViewModel:

using System;  
using System.Collections.ObjectModel;  
using System.ComponentModel;  
using System.Windows;  
using System.Windows.Data;  
  
namespace WpfApp025  
{  
  public class ViewModel  
  {  
    AcController acController;  
    public ViewModel()  
    {  
      //creating the singelton object  
      acController = AcController.CreateInstance();  
      //Create the view  
      cvsView.Source = acController.AlarmList;  
      //Sort view  
      cvsView.View.SortDescriptions.Add(new SortDescription("Time", ListSortDirection.Ascending));  
      //connect view to ListView  
      // -> Binding!  
      cvsDataView.Source = acController.AlarmList;  
  
      DataView.SortDescriptions.Clear();  
      SortDescription sd = new SortDescription("Id", ListSortDirection.Descending);  
      DataView.SortDescriptions.Add(sd);  
      //dataView.Refresh();  
    }  
    private CollectionViewSource cvsView = new CollectionViewSource();  
    public ICollectionView View { get => cvsView.View; }  
  
    private CollectionViewSource cvsDataView = new CollectionViewSource();  
    public ICollectionView DataView { get => cvsDataView.View; }  
  }  

  internal class AcController  
  {  
...  
  }  

  public class Data  
  {  
    public int Id { get; set; }  
    public DateTime Time { get; set; }  
  }  
}

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How to sort two ListViews with the same source independently

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