WPF binging概念

binding
源-目标
binding源是逻辑层的对象
binding目标是UI层的控件对象
怎样才能让一个属性具备通知binding值已经改变的能力呢？

using System;
using System.Collections.Generic;
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.Shapes;

namespace StackPanelDemo
{
    /// <summary>
    /// Window3.xaml 的交互逻辑
    /// </summary>
    public partial class Window3 : Window
    {
        Student student;

        public Window3()
        {
            InitializeComponent();
            student = new Student();

            Binding binding = new Binding();
            binding.Source = student;//给binging指定数据源
            binding.Path = new PropertyPath("Name");//给binging指定访问路径

            BindingOperations.SetBinding(nameTextBox, TextBox.TextProperty,binding);//把数据源和目标连接在一起，第一个参数指定binging的目标，第二个参数指定送达目标的哪个属性，第三个参数指定哪个binging把数据源和目标连接起来
        }

        private void nameBtn_click(object sender, RoutedEventArgs e)
        {
            student.Name += "name";
        }
    }
}

<Window x:Class="StackPanelDemo.Window3"
        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:StackPanelDemo"
        mc:Ignorable="d"
        Title="Window3" Height="450" Width="800">
    <Grid>
        <StackPanel>
            <TextBox Name="nameTextBox" Margin="10"></TextBox>
            <Button Content="show name" Margin="10" Click="nameBtn_click"></Button>
        </StackPanel>
    </Grid>
</Window>

实例2

using System;
using System.Collections.Generic;
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.Shapes;

namespace BindDemo
{
    /// <summary>
    /// Window1.xaml 的交互逻辑
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();

            List<Student> students = new List<Student>();
            students.Add(new Student() { Id = 1, Name = "Tom", Age = 16 });
            students.Add(new Student() { Id = 2, Name = "Tom2", Age = 26 });
            students.Add(new Student() { Id = 2, Name = "Tom3", Age = 36 });

            //listBox设置binding
            aListBox.ItemsSource = students;
            aListBox.DisplayMemberPath = "Name";

            //为TextBox设置binding
            Binding binding = new Binding("SelectedItem.Id") { Source=aListBox};
            aTextBox.SetBinding(TextBox.TextProperty, binding);
        }
    }
}

<Window x:Class="BindDemo.Window1"
        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:BindDemo"
        mc:Ignorable="d"
        Title="Window1" Height="450" Width="800">
    <Grid>
        <StackPanel>
            <TextBlock Text="student id:" Margin="10"></TextBlock>
            <TextBox Name="aTextBox" Margin="10"></TextBox>
            <TextBlock Text="student list" Margin="10"></TextBlock>
            <ListBox Name="aListBox"></ListBox>
        </StackPanel>
    </Grid>
</Window>