BindingOperations.GetBindingExpression


   
  



<Window x:Class="WpfApplication1.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:local="clr-namespace:WpfApplication1" 
  Title="ManualUpdateTarget" Height="135" Width="200">
  <Window.Resources>
    <local:Person x:Key="Tom" Name="Tom" Age="11" />
  </Window.Resources>
  <StackPanel DataContext="{StaticResource Tom}">
    <TextBlock Margin="5" VerticalAlignment="Center">Name:</TextBlock>
    <TextBox Margin="5" Name="nameTextBox" Text="{Binding Path=Name}" />
    <TextBlock Margin="5" VerticalAlignment="Center">Age:</TextBlock>
    <TextBox Margin="5" Name="ageTextBox" Text="{Binding Path=Age}" />
    <Button Margin="5" Width="75" Name="birthdayButton">Birthday</Button>
  </StackPanel>
</Window>

//File:Window.xaml.cs

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

namespace WpfApplication1 {
  public class Person {
    string name;
    public string Name {
      get { return this.name; }
      set {
        if( this.name == value ) { return; }
        this.name = value;
      }
    }

    int age;
    public int Age {
      get { return this.age; }
      set {
        if( this.age == value ) { return; }
        this.age = value;
      }
    }

    public Person() { }
    public Person(string name, int age) {
      this.name = name;
      this.age = age;
    }
  }

  public partial class Window1 : System.Windows.Window {
    public Window1() {
      InitializeComponent();
      this.birthdayButton.Click += birthdayButton_Click;
    }

    void birthdayButton_Click(object sender, RoutedEventArgs e) {
      Person person = (Person)this.FindResource("Tom");
      person.Age = person.Age+1;
      BindingOperations.GetBindingExpression(ageTextBox, TextBox.TextProperty).UpdateTarget();

      Console.WriteLine(person.Name);
      Console.WriteLine(person.Age);
    }
  }
}