Question

我无法弄明白。我错过了约束Textblock？每当我在TextBlock中选择一个新项目时，我都需要ListView更新。

这是我制作的样本。我是真正的应用程序，我使用ListView1中的id从我的数据库中获取要在textBlock中显示的内容..

我知道WPF绑定到属性，我需要实现INotifyPropertyChanged，但是我无法正确绑定绑定或者我错过了其他内容？

我添加了DateTime.Now.TosString()只是为了更清楚地了解TextBlock是否发生变化。

XAML：

<Window x:Class="WpfSO.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="30"/>
            <RowDefinition />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition />
        </Grid.ColumnDefinitions>

        <TextBlock Grid.Row="0" x:Name="txtBlockPerson" 
                                Text="{Binding MyPerson}" />


        <ListView Grid.Row="1" Grid.Column="0" x:Name="ListView1" 
                  ItemsSource="{Binding ListData}" 
                  IsSynchronizedWithCurrentItem="True" 
                  SelectionChanged="ListView1_SelectionChanged">

            <ListView.ItemContainerStyle>
                <Style TargetType="ListViewItem">
                    <Setter Property="HorizontalContentAlignment" Value="Left" />
                </Style>
            </ListView.ItemContainerStyle>

            <ListView.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Text="{Binding Name}"></TextBlock>
                    </StackPanel>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
    </Grid>
</Window>

C＃

using System;
using System.ComponentModel;
using System.Windows;
using System.Collections.ObjectModel;

namespace WpfSO
{
    public partial class MainWindow : Window
    {
        private ObservableCollection<Person> ListData { get; set; }
        private const string _myName = "You clicked on: ";
        public Person MyPerson { get; set; }

        public MainWindow()
        {
            InitializeComponent();

            // TextBlock
            MyPerson = new Person(_myName);
            txtBlockPerson.DataContext = MyPerson;

            // ListView
            ListData = new ObservableCollection<Person>();
            var p1 = new Person("p1");
            var p2 = new Person("p2");
            ListData.Add(p1);
            ListData.Add(p2);

            ListView1.ItemsSource = ListData;
        }

        private void ListView1_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
        {
            MyPerson.Name = _myName + ListView1.SelectedItem + ". Time: " +DateTime.Now.ToString(); 
        }
    }

    public class Person : INotifyPropertyChanged
    {
        private string _name;
        public event PropertyChangedEventHandler PropertyChanged;

        public string Name
        {
            get { return _name; }
            set
            {
                if (value != _name)
                {
                    _name = value;
                    OnPropertyChanged("PersonName");
                }
            }
        }

        public Person(string name)
        {
            Name = name;
        }

        // Create the OnPropertyChanged method to raise the event 
        protected void OnPropertyChanged(string name)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(name));
            }
        }
    }
}

Answer 1

OnPropertyChanged需要具有正确的属性名称..

而不是OnPropertyChanged("PersonName");使用

OnPropertyChanged("Name");

将TextBlock绑定到ListView更改的属性

1 个答案: