wpf binding例子 优化

1、binding源为非控件，而是C#类/实例

窗体（V）代码，

<Window x:Class="WpfBindingApp1.MainWindow"
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:WpfBindingApp1"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<TextBlock Width="160" Height="50" Text="年龄：" Margin="37,192,603,193" FontSize="20"/>
<TextBox Width="160" Height="50" x:Name="tb333" Text="{Binding person.Age}" Margin="134,173,506,212"/>
<TextBlock Width="160" Height="50" Text="姓名：" Margin="37,266,603,119" FontSize="20"/>
<TextBox Width="160" Height="50" x:Name="tb444" Margin="134,247,506,138" Text="{Binding person.Name}" />

<Button x:Name="btn111" Width="80" Height="60" Click="btn111_Click" Margin="360,299,360,76"/>
</Grid>
</Window>

C#后台（VM）代码，这里为了好看，可以把person类改名为xxViewModel

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
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.Navigation;
using System.Windows.Shapes;

namespace WpfBindingApp1
{
public partial class MainWindow : Window
{
public event PropertyChangedEventHandler PropertyChanged;

//要使用{ get; set; }，令其作为属性，而不能是字段。
public PersonViewModel person { get; set; } = new PersonViewModel();

public MainWindow()
{
InitializeComponent();
person.Age = 10;
person.Name = "Tom";

this.DataContext = this;　　//如果这里this.DataContex=person,则界面上 binding直接绑person的属性即可，而不用带person.
}

private void btn111_Click(object sender, RoutedEventArgs e)
{
person.Age += 1;
person.Name += "+2" ;
}
}

public class PersonViewModel: INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;

private string _name;
public string Name
{
get { return _name; }
set
{
_name = value;
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Name"));
}
}
private int _age;
public int Age
{
get { return _age; }
set
{
_age = value;
if (PropertyChanged != null)
{
this.PropertyChanged.Invoke(this, new PropertyChangedEventArgs("Age"));
}
}
}
}
}