1、简单示例如下
1、界面设计如下，通过文本绑定 Name 属性 ，点击按钮修改对象类中name的值，通过通知事件修改界面的值。
2、People类设计如下
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.ComponentModel;namespace WpfAppDemo
{
public class People : INotifyPropertyChanged //向客户端发出某一属性值已更改的通知
{
private int _age; public event PropertyChangedEventHandler PropertyChanged;
private string name;
public string Name
{
get { return name; }
set
{
name = value;
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs("Name"));
}
}
}}
}
3、代码实现
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
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 WpfAppDemo
{
/// <summary>
/// BindingDemo.xaml 的交互逻辑
/// </summary>
public partial class BindingDemo : Window
{
private People _people;
public BindingDemo()
{
InitializeComponent();
Init(); }
private void Init()
{
_people = new People(1, "小红");
//grid 绑定的对象，会先找本身绑定 textbox如果没有绑定name的值则向上找到grid绑定的对象name属性的值
this.grid.DataContext = _people;
} /// <summary>
/// 修改_people对象的值，界面跟着变化
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="RoutedEventArgs"/> instance containing the event data.</param>
private void Button_Click(object sender, RoutedEventArgs e)
{
_people.Name = "test";
}
}
}
2、完善示例demo
1、运行效果如下图：姓名txtbox绑定people中的Name、Age属性，通过按钮修改他们的属性值；选择txtbox绑定listbox选择
项的值，背景颜色使用listbox选择项的值。选择项2：绑定label的txt值。绑定模式Mode：TwoWay 绑定会将源数据发送到目标，如果目标属性的值发生变化，则会将它们发回给源，OneWay 则不会。
1）使用 OneWay 绑定时，每当数据源(ListBox)发生变化时，数据就会从数据源流向目标(TextBlock)。
2）OneTime 绑定也会将数据从源发送到目标；但是，仅当启动了应用程序或 DataContext 发生更改时才会如此操作，因此，它不会侦听源中的更改通知。
3）OneWayToSource 绑定会将数据从目标发送到源。
4）TwoWay 绑定会将源数据发送到目标，但如果目标属性的值发生变化，则会将它们发回给源。
2、前台xaml设置：
<Window x:Class="WpfAppDemo.BindingDemo" Background="Aqua"
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:WpfAppDemo"
mc:Ignorable="d"
Title="主界面" Height="809.132" Width="790.635" WindowStartupLocation="CenterScreen">
<Grid Name="GridInfo" Background="LightSkyBlue">
<Button Content="修改姓名" BorderBrush="Blue" HorizontalAlignment="Left" Margin="10,60,0,0" VerticalAlignment="Top"
Width="75" Click="Button_Click"/>
<TextBox Name="TxtName" BorderBrush="Aqua" HorizontalAlignment="Left" Height="23" Margin="47,32,0,0"
TextWrapping="Wrap" Text="{Binding Path=Name }" VerticalAlignment="Top" Width="120" />
<Label Content="姓名" HorizontalAlignment="Left" Margin="2,28,0,0" VerticalAlignment="Top"/>
<Label Name="LabelTxt" Content="您选择了：" HorizontalAlignment="Left" Margin="139,121,0,0"
VerticalAlignment="Top" RenderTransformOrigin="0.2,3.16"/>
<TextBox HorizontalAlignment="Left" Height="23" Margin="139,214,0,0" TextWrapping="Wrap"
Text="{Binding LabelTxt}" VerticalAlignment="Top" Width="120"/>
<ListBox x:Name="ListStockName" Background="AntiqueWhite" HorizontalAlignment="Left" Height="159"
Margin="21,121,0,0" VerticalAlignment="Top" Width="88">
<ListBoxItem Content="Blue"/>
<ListBoxItem Content="Red"/>
<ListBoxItem Content="Green"/>
<ListBoxItem Content="Gray"/>
<ListBoxItem Content="Cyan"/>
<ListBoxItem Content="GreenYellow"/>
<ListBoxItem Content="Orange"/>
</ListBox>
<TextBox HorizontalAlignment="Left" Height="23" Margin="139,156,0,0" TextWrapping="Wrap"
Background="{Binding ElementName=ListStockName, Path= SelectedItem.Content}"
Text="{Binding ElementName=ListStockName,Path= SelectedItem.Content,Mode=TwoWay}" VerticalAlignment="Top" Width="120"/>
<Label x:Name="LabelTxt1" Content="您选择了2：" HorizontalAlignment="Left" Margin="139,189,0,0" VerticalAlignment="Top" RenderTransformOrigin="0.2,3.16"/>
<TextBox Name="TxtName2" HorizontalAlignment="Left" Height="23" Margin="139,214,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120"/>
<TextBox Name="TextBoxAge" HorizontalAlignment="Left" Height="23" Margin="301,28,0,0"
Text="{Binding Path=Age,Mode=TwoWay}" TextWrapping="Wrap" VerticalAlignment="Top" Width="120"/>
<Button Name="ButtonChangeAge" Content="修改年龄" HorizontalAlignment="Left" Margin="301,61,0,0"
VerticalAlignment="Top" Width="75" Click="ButtonChangeAge_Click"/>
<Label Content="年龄" HorizontalAlignment="Left" Margin="243,28,0,0" VerticalAlignment="Top" RenderTransformOrigin="-4,0.76"/>
<!--Text="{Binding ElementName=LabelTxt1,Path=Content}"-->
</Grid>
</Window>
3、后台代码实现：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
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 WpfAppDemo
{
/// <summary>
/// BindingDemo.xaml 的交互逻辑
/// </summary>
public partial class BindingDemo : Window
{
private People _people;
public BindingDemo()
{
InitializeComponent();
Init();
} private void Init()
{
_people = new People(10, "小明");
//grid 绑定的对象，会先找本身绑定 textbox如果没有绑定name的值则向上找到grid绑定的对象name属性的值
GridInfo.DataContext = _people; //姓名绑定 TextBoxAge.DataContext = _people; //姓名绑定，直接控件绑定
Binding binding = new Binding(); //您选择了2 textbox绑定另一个控件的属性
binding.Source = LabelTxt1;
binding.Path = new PropertyPath("Content");
this.TxtName2.SetBinding(TextBox.TextProperty, binding); //或者在前台绑定 <!--Text="{Binding ElementName=LabelTxt1,Path=Content}"--> BindingOperations.ClearBinding(TxtName2, TextBox.TextProperty); //移除绑定BindingOperations同时还提供了ClearAllBindings方法，只需要传入要清除绑定的目标对象的名称，它就会将所有这个对象的绑定移除。
} /// <summary>
/// 修改_people对象姓名的值，界面跟着变化
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="RoutedEventArgs"/> instance containing the event data.</param>
private void Button_Click(object sender, RoutedEventArgs e)
{
_people.Name = "小华";
} /// <summary>
/// 改变年龄的值，界面跟着变化
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="RoutedEventArgs"/> instance containing the event data.</param>
private void ButtonChangeAge_Click(object sender, RoutedEventArgs e)
{
_people.Age = 30;
}
}
}
4、people类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.ComponentModel;namespace WpfAppDemo
{
public class People : INotifyPropertyChanged
{
private int _age; public event PropertyChangedEventHandler PropertyChanged;
private string name;
protected void Notify(string propName)
{
if (this.PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propName));
} }
public string Name
{
get { return name; }
set
{
name = value;
Notify("Name");
}
} public int Age
{
get { return _age; }
set
{
if (value < 0)
{
value = 0;
}
else
{
_age = value;
}
Notify("Age"); }
} public People(int age, string name)
{
this.Age = age;
this.Name = name;
} public string Action()
{
if (Age < 20)
{
return "小学生";
}
else if (Age < 30 && Age > 20)
{
return "大学";
}
else
{
return "教学";
} }
}
}
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