雨中即景

xaml

<Window x:Class="WpfApplication2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="150" Width="300">
  <StackPanel Margin="15">
    <WrapPanel>
      <TextBlock>Before Label Name:</TextBlock>
      <Label Content="{Binding Path=Name, ElementName=theLabel}"/>
      <TextBlock>After Label Name:</TextBlock>
      <Label Name="theLabel" Content="{Binding Name}" />
    </WrapPanel>
    <WrapPanel>
    <Button Click="Button_Click">Button</Button>
    </WrapPanel>
  </StackPanel>
</Window>

 

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;

using System.ComponentModel;

namespace WpfApplication2
{
  /// 

  /// MainWindow.xaml 的互動邏輯
  /// 
  public partial class MainWindow : Window
  {
    class TestObject : INotifyPropertyChanged
    {
      private string _name;

      public string Name
      {
        get
        {
          return _name;
        }

        set
        {
          if (_name == value) return;

          _name = value;
          OnPropertyChanged("Name");
        }
      }

      #region INotifyPropertyChanged Members

      public event PropertyChangedEventHandler PropertyChanged;

      protected virtual void OnPropertyChanged(string propertyName)
      {
        if (PropertyChanged != null)
        {
          PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
      }

      #endregion
    }
    TestObject t = new TestObject();
    public MainWindow()
    {
      InitializeComponent();
      this.DataContext = this;
      theLabel.DataContext = t;
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
      t.Name = "Foo";
    }
  }
}