WPF：向客戶端發出某一屬性值已更改的通知INotifyPropertyChanged接口

Person.cs

using System.ComponentModel;

namespace _01_INotifyPropertyChanged
{
    class Person:INotifyPropertyChanged
    {
        private double height;
        private double weight;
        public double Height {
            set
            {
                this.height = value;
            }

            get
            {
                return height;
            }
        }
        public double Weight 
        {
            set
            {
                this.weight = value;
                if (PropertyChanged != null)
                {
                    PropertyChanged(this, new PropertyChangedEventArgs("Weight"));
                }
            }

            get
            {
                return weight;
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
    }
}

MainWindow.xaml

<Window x:Class="_01_INotifyPropertyChanged.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" WindowStartupLocation="CenterScreen" FontSize="14" Loaded="Window_Loaded">
    <Grid>
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition></ColumnDefinition>
                <ColumnDefinition></ColumnDefinition>
                <ColumnDefinition></ColumnDefinition>
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
            </Grid.RowDefinitions>
            <TextBlock Text="身高" VerticalAlignment="Center" HorizontalAlignment="Right"></TextBlock>
            <TextBox Text="{Binding Height}" Name="txtHeight" Grid.Column="1" VerticalAlignment="Center" HorizontalAlignment="Center" Width="58"></TextBox>
            <Button Name="btnHeightIncrease" Content="身高加1" Grid.Column="2" VerticalAlignment="Center" HorizontalAlignment="Left" Click="btnHeightIncrease_Click"></Button>
            <TextBlock Text="體重" Grid.Row="1" VerticalAlignment="Center" HorizontalAlignment="Right"></TextBlock>
            <TextBox Text="{Binding Weight}" Name="txtWeight" Grid.Row="1" Grid.Column="1" VerticalAlignment="Center" HorizontalAlignment="Center" Width="58"></TextBox>
            <Button Name="btnWeightIncrease" Content="體重加1" Grid.Row="1" Grid.Column="2" VerticalAlignment="Center" HorizontalAlignment="Left" Click="btnWeightIncrease_Click"></Button>
            <DataGrid Name="dgPerson" Grid.Row="2" Grid.ColumnSpan="3" BorderBrush="White" Background="White" CanUserAddRows="False"></DataGrid>
        </Grid>
    </Grid>
</Window>

MainWindow.xaml.cs

using System.Collections.Generic;
using System.Windows;
using System.Windows.Documents;

namespace _01_INotifyPropertyChanged
{
    /// <summary>
    /// MainWindow.xaml 的交互邏輯
    /// </summary>
    public partial class MainWindow : Window
    {
        Person person = new Person();
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            List<Person> listPerson = new List<Person>();
            person.Height = 175.3;
            person.Weight = 66.7;
            listPerson.Add(person);

            txtHeight.DataContext = txtWeight.DataContext = person;
            dgPerson.ItemsSource = listPerson;
        }

        private void btnHeightIncrease_Click(object sender, RoutedEventArgs e)
        {
            person.Height++;
            MessageBox.Show(string.Format("身高現在是{0}，但dgPerson綁定的數據沒有刷新。", person.Height));

        }

        private void btnWeightIncrease_Click(object sender, RoutedEventArgs e)
        {
            person.Weight++;
            MessageBox.Show(string.Format("體重現在是{0}，dgPerson已刷新。", person.Weight));
        }
    }
}

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