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  • INotitypropertyChanged

    WPF数据绑定(要是后台类对象的属性值发生改变,通知在“client界面与之绑定的控件值”也发生改变须要实现INotitypropertyChanged接口)

    MainWindow.xaml

    <Window x:Class="WpfApplication1.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" Loaded="Window_Loaded">
        <Grid>
            <TextBox Text="{Binding Name}"  Height="23" HorizontalAlignment="Left" Margin="122,68,0,0" Name="txtName" VerticalAlignment="Top" Width="120" />
            <TextBox Text="{Binding Age}" Height="23" HorizontalAlignment="Left" Margin="122,124,0,0" Name="txtAge" VerticalAlignment="Top" Width="120" />
            <TextBlock Height="23" HorizontalAlignment="Left" Margin="82,71,0,0" Name="textBlock1" Text="姓名" VerticalAlignment="Top" />
            <TextBlock Height="23" HorizontalAlignment="Left" Margin="82,127,0,0" Name="textBlock2" Text="年龄" VerticalAlignment="Top" />
            <Button Content="Age++" Height="23" HorizontalAlignment="Left" Margin="262,71,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />
            <Button Content="显示Age" Height="23" HorizontalAlignment="Left" Margin="262,124,0,0" Name="button2" VerticalAlignment="Top" Width="75" Click="button2_Click" />
        </Grid>
    </Window>
    

    MainWindow.xaml.cs

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    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 WpfApplication1
    {
        /// <summary>
        /// MainWindow.xaml 的交互逻辑
        /// </summary>
        public partial class MainWindow : Window
        {
            Person p1 = new Person();
            public MainWindow()
            {
                InitializeComponent();
            }
    
            private void Window_Loaded(object sender, RoutedEventArgs e)
            {
                p1.Name = "李大钊";
                p1.Age = 28;
    
                txtName.DataContext = p1;
                txtAge.DataContext = p1;
            }
    
            private void button1_Click(object sender, RoutedEventArgs e)
            {
                p1.Age++;
            }
    
            private void button2_Click(object sender, RoutedEventArgs e)
            {
                MessageBox.Show((p1.Age).ToString());
            }
        }
    }
    

    Model

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.ComponentModel;
    
    namespace WpfApplication1
    {
        /// <summary>
        /// INotifyPropertyChanged接口是向client发出某一属性值已经更改的通知
        /// INotifyPropertyChanged是.net内置的接口,数据绑定DataContext是否实现了INotityPropertyChanged接口,假设实现了,就会监听PropertyChanged得知属性的变化
        /// 假设要求后台对象的值发送改变,界面的值也跟着变,则须要实现INotityPropertyChanged接口。而且在对象属性值变化后触发事件
        /// 假设说后台对象的值会不变,则没有必要实现这个接口
        /// </summary>
        public class Person:INotifyPropertyChanged
        {
            private string name;
            public string Name
            {
                get
                {
                    return name;
                }
    
                set
                {
                   this.name = value;
                   if (PropertyChanged != null)
                   {   //假设Name属性发生了改变,则触发这个事件
                       PropertyChanged(this, new PropertyChangedEventArgs("Name"));
                   }
                }
            }
    
            private int age;
            public int Age
            {
                get
                {
                    return age;
                }
    
                set
                {
                    this.age = value;
                    //假设有人(数据绑定的对象来监听的)监听这个事件(假设有人监听就是不等于null,假设没人监听这个事件就等于null)
                    if (PropertyChanged != null)
                    { 
                        //假设Age属性发生了改变,则触发这个事件
                        PropertyChanged(this,new PropertyChangedEventArgs("Age"));
                    }
                }
            }
    
            public event PropertyChangedEventHandler PropertyChanged;
            
        }
    }
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  • 原文地址:https://www.cnblogs.com/Jeely/p/11075994.html
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