WPF：向客户端发出某一属性值已更改的通知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="体重" 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="体重加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 的交互逻辑

    /// </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("身高现在是{0}，但dgPerson绑定的数据没有刷新。", person.Height));



        }



        private void btnWeightIncrease_Click(object sender, RoutedEventArgs e)

        {

            person.Weight++;

            MessageBox.Show(string.Format("体重现在是{0}，dgPerson已刷新。", person.Weight));

        }

    }

}