Using filter method of listview in WPF

[kinakira2013]

Hi,

I want to filter information (Name/Age/..) from textbox and show results in a listview (WPF) as an example from https://wpf-tutorial.com/listview-control/listview-filtering/ . However, There was an error and my program stopped. When I debugged this program, it stopped at the code line:

InitializeComponent();

 Please advise me,

Thanks & Best Regards,

Kin

[_gile]

Hi,

Beyond the fact that your question has nothing to do with AutoCAD programming (which is the subject of this forum), it is impossible to answer your question with so little information.

The code in the link you give works correctly. You certainly copied it wrong.

[kinakira2013]

Hi @_gile ,

I mean that I want to create a dialog WPF with a Filter function via AutoCAD command method.

       [CommandMethod("SEARCHTEST")]
        public void cmd_SearchTest()
        {            
            var SearchDialog = new Search();
            var result = AcAp.ShowModalWindow(SearchDialog);
        }

Code-behind:

using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;

namespace Test
{    
    public partial class Search : Window
    {
        public Search()
        {
            InitializeComponent();
            List<User> items = new List<User>();
            items.Add(new User() { Name = "John Doe", Age = 42 });
            items.Add(new User() { Name = "Jane Doe", Age = 39 });
            
            lvSearch.ItemsSource = items;

            CollectionView view = (CollectionView)CollectionViewSource.GetDefaultView(lvSearch.ItemsSource);

            view.Filter = User_Filter;            
        }

        private void TxtSearch_TextChanged(object sender,TextChangedEventArgs e)
        {              
            CollectionViewSource.GetDefaultView(lvSearch.ItemsSource).Refresh();            
        }

        private bool User_Filter(object item)
        {
            if (string.IsNullOrEmpty(txtSearch.Text))
            {
                return true;
            }
            else
            {
                return (item as User).Name.IndexOf(txtSearch.Text, StringComparison.OrdinalIgnoreCase)>=0;
            }
        }

        public class User
        {
            public string Name { get; set; }
            public int Age { get; set; }            
        }
   }
}

When I run this command, an error message appears as bellow photo

Best Regards,

Kin

[_gile · Accepted solution]

It works for me like this:

XAML

<Window x:Class="Test.Search"
        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"
        mc:Ignorable="d"
        Title="FilteringSample" Height="200" Width="300">
    <DockPanel Margin="10">
        <TextBox DockPanel.Dock="Top" Margin="0,0,0,10" Name="txtSearch" TextChanged="TxtSearch_TextChanged" />
        <ListView Name="lvSearch">
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="Name" Width="120" DisplayMemberBinding="{Binding Name}" />
                    <GridViewColumn Header="Age" Width="50" DisplayMemberBinding="{Binding Age}" />
                </GridView>
            </ListView.View>
        </ListView>
    </DockPanel>
</Window>

Code behind:

using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;

namespace Test
{
    public partial class Search : Window
    {
        public Search()
        {
            InitializeComponent();
            List<User> items = new List<User>();
            items.Add(new User() { Name = "John Doe", Age = 42 });
            items.Add(new User() { Name = "Jane Doe", Age = 39 });

            lvSearch.ItemsSource = items;

            CollectionView view = (CollectionView)CollectionViewSource.GetDefaultView(lvSearch.ItemsSource);

            view.Filter = User_Filter;
        }

        private void TxtSearch_TextChanged(object sender, TextChangedEventArgs e)
        {
            CollectionViewSource.GetDefaultView(lvSearch.ItemsSource).Refresh();
        }

        private bool User_Filter(object item)
        {
            if (string.IsNullOrEmpty(txtSearch.Text))
            {
                return true;
            }
            else
            {
                return (item as User).Name.IndexOf(txtSearch.Text, StringComparison.OrdinalIgnoreCase) >= 0;
            }
        }

        public class User
        {
            public string Name { get; set; }
            public int Age { get; set; }
        }
    }
}

Commands class:

using Autodesk.AutoCAD.Runtime;

using AcAp = Autodesk.AutoCAD.ApplicationServices.Application;

namespace Test
{
    public class Commands
    {
        [CommandMethod("SEARCHTEST")]
        public void cmd_SearchTest()
        {
            var SearchDialog = new Search();
            var result = AcAp.ShowModalWindow(SearchDialog);
        }
    }
}

[kinakira2013]

Thanks for your test, _gile !

Maybe some causes from my system, I'm trying to find them.

Best Regards,

Kin