在 WPF 应用程序中使用 INotifyPropertyChanged

Question

我在 WPF 应用程序中使用 .Net 4.6.1。我们有一个 ObservableCollection 并且我们希望将集合绑定到一个列表视图，该列表视图需要按字母顺序排序并自动更新集合中的新项目。

我使用 CollectionViewSource 并在 Whosebug 上搜索更新我需要使用 INotifyPropertyChanged。但由于某种原因它不起作用:(.

对象class：

using System.Text;
using System.Threading.Tasks;

namespace ObservableCollection
{
    public class AlarmTypes : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        private string name; 
        public AlarmTypes(string _name)
        {
            this.name = _name;
        }

        public string Name
        {
            get { return name; }
            set
            {
                name = value;
                OnPropertyChanged("Name");

            }
        }

        protected void OnPropertyChanged(string prop)
        {
            PropertyChangedEventHandler handler = PropertyChanged;

            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(prop));
            }
        }
    }
}

XAML 文件

<Window x:Class="ObservableCollection.MainWindow"
        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:ObservableCollection"
        xmlns:componentModel="clr-namespace:System.ComponentModel;assembly=WindowsBase"
        xmlns:clr="clr-namespace:System;assembly=mscorlib"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>


        <Grid.Resources>
            <CollectionViewSource x:Name="CollectionViewSource" x:Key="src" Source="{Binding alarmTypes }" IsLiveFilteringRequested="True">
                <CollectionViewSource.LiveSortingProperties>
                    <clr:String>Name</clr:String>
                </CollectionViewSource.LiveSortingProperties>
                <CollectionViewSource.SortDescriptions>
                    <componentModel:SortDescription PropertyName="Name" />
                </CollectionViewSource.SortDescriptions>
            </CollectionViewSource>
        </Grid.Resources>



        <ListView x:Name="lstAlarmTypes" HorizontalAlignment="Left" Height="319" Margin="585,48,0,0" VerticalAlignment="Top" Width="157" ItemsSource="{Binding Source={StaticResource src}}">
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="Name"  DisplayMemberBinding="{Binding Name}" />
                </GridView>
            </ListView.View>
        </ListView>
        <TextBox HorizontalAlignment="Left" Height="23" Margin="10,48,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120" Name="textBox1"/>
        <Button Content="Add item" HorizontalAlignment="Left" Margin="173,51,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click"/>
        <ListView x:Name="LstNames2" HorizontalAlignment="Left" Height="301" Margin="339,66,0,0" VerticalAlignment="Top" Width="180">
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="Name"  DisplayMemberBinding="{Binding Name}"/>
                </GridView>
            </ListView.View>
        </ListView>

    </Grid>
</Window>

XAML.cs 后面的代码：

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace ObservableCollection
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private ObservableCollection<AlarmTypes> alarmTypes = new ObservableCollection<AlarmTypes>();
        private ObservableCollection<AlarmTypes> sortedTypes = new ObservableCollection<AlarmTypes>();


        public MainWindow()
        {
            InitializeComponent();
            LstNames2.ItemsSource = alarmTypes;

            var alarmType = new AlarmTypes("inbraak");            
            alarmTypes.Add(alarmType);

            var alarmType2 = new AlarmTypes("alarm");
            //alarmType.Name = textBox1.Text;
            alarmTypes.Add(alarmType2);

        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            var alarmType = new AlarmTypes(textBox1.Text);
            //alarmType.Name = textBox1.Text;
            alarmTypes.Add(alarmType);


        }
    }
}

我不知道是绑定不起作用还是属性或者我还需要其他东西。第一个列表仅绑定到 Observable 集合，并且在从文本框输入数据时有效。但是具有 collectionViewSource 的第二个列表视图显然不起作用。有什么想法遗漏了吗？

Answer 1

您需要将 alarmTypes 变成 public 属性。

在 WPF 应用程序中使用 INotifyPropertyChanged

Using INotifyPropertyChanged in WPF applicatoin

c#

wpf

.net-4.6.1