Binding TwoWay demo

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.ComponentModel;
using System.Windows.Data;


//System.ComponentModel 命名空间提供用于实现组件和控件运行时和设计时行为的类。
//此命名空间包括用于实现属性和类型转换器、绑定到数据源以及授权组件的基类和接口。 


namespace SilverlightApplication2
{
    public partial class text : UserControl
    {
       //一定要是公共的
        User user = null;// new User();
        public text()
        {
            InitializeComponent();   
        }
        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
        //    System.ComponentModel.BindableAttribute
           // Binding 
            user =  new User();
            user.Name = "TerryLee";
            user.Address = "中国 天津";
            //DataContext 数据上下文类型
            //只要把user对象给控件的数据上下文即可
            lblName.DataContext = user;  
            lblAddress.DataContext = user;

        }

        private void ChangeP_Click(object sender, RoutedEventArgs e)
        {
            user.Address = "china beijing";
            user.Name = "muer";

        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            this.CurrentPr.Text = "     name:" + user.Name.ToString() + "   Address:" + user.Address.ToString(); ;
        }

    }

    //INotifyPropertyChanged：向客户端发出某一属性值已更改的通知。
    public class User : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

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

        private string _address;
        public string Address
        {
            get { return _address; }
            set
            {
                _address = value;
                if (PropertyChanged != null)
                {
                    PropertyChanged(this, new PropertyChangedEventArgs("Address"));
                }
            }
        }
    }
}

<UserControl x:Class="SilverlightApplication2.text"
    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"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400" Loaded="UserControl_Loaded">

    <Grid x:Name="LayoutRoot" Background="#46461F">
        <Grid.RowDefinitions>
            <RowDefinition Height="160"></RowDefinition>
            <RowDefinition Height="40"></RowDefinition>
            <RowDefinition Height="40"></RowDefinition>
            <RowDefinition Height="40"></RowDefinition>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="150"></ColumnDefinition>
            <ColumnDefinition Width="*"></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Button Width="100" Height="30" HorizontalAlignment="Left"
                Content="当前页面的属性值"
                Grid.Row="0" 
                Grid.Column="0"
                Click="Button_Click"/>
        <TextBlock Foreground="White" FontSize="18" Text="姓名："
           Grid.Row="1" Grid.Column="0" HorizontalAlignment="Right"/>
        <TextBox x:Name="lblName" FontSize="18"
               Grid.Row="1" Grid.Column="1" HorizontalAlignment="Left"
               Text="{Binding Name,Mode=TwoWay}"/>
        <TextBlock Foreground="White" FontSize="18" Text="位置："
               Grid.Row="2" Grid.Column="0" HorizontalAlignment="Right"/>
        <TextBox x:Name="lblAddress" FontSize="18"
               Grid.Row="2" Grid.Column="1" HorizontalAlignment="Left"
               Text="{Binding Address,Mode=TwoWay}"/>
        <Button Name="ChangeP" Click="ChangeP_Click"
                DataContext="{Binding}"
                Content="改变属性值 "
                HorizontalAlignment="Left"
                Width="78"
                Height="30"
                Grid.Column="1"
                Grid.Row="0"
                ></Button>
        <TextBlock Foreground="White" FontSize="18"
                   x:Name="CurrentPr"
                   Grid.Row="4" 
                   Grid.Column="0"
                   HorizontalAlignment="Left"
                   Grid.ColumnSpan="2"/>
    </Grid>
</UserControl>

总结：通过  Text="{Binding Address,Mode=TwoWay}"  这种方式，当我点击提交按钮的时候不需要写个方法去拿页面上所有元素的值，
只要拿到当前实例化的对象User就可以拿到这个页面的所有的值。这就是MVVM所带来的便捷，可以让开发人员少写很多代码。