BindingOperations.GetBindingExpression : Binding « Windows Presentation Foundation « VB.Net Tutorial






<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.vb

Imports System
Imports System.Collections.Generic
Imports System.Text
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Documents
Imports System.Windows.Input
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Imports System.Windows.Shapes
Imports System.ComponentModel

Namespace WpfApplication1
  Public Class Person
    Private m_name As String
    Public Property Name() As String
      Get
        Return Me.m_name
      End Get
      Set
        If Me.m_name = value Then
          Return
        End If
        Me.m_name = value
      End Set
    End Property

    Private m_age As Integer
    Public Property Age() As Integer
      Get
        Return Me.m_age
      End Get
      Set
        If Me.m_age = value Then
          Return
        End If
        Me.m_age = value
      End Set
    End Property

    Public Sub New()
    End Sub
    Public Sub New(name As String, age As Integer)
      Me.m_name = name
      Me.m_age = age
    End Sub
  End Class

  Public Partial Class Window1
    Inherits System.Windows.Window
    Public Sub New()
      InitializeComponent()
      AddHandler Me.birthdayButton.Click, AddressOf birthdayButton_Click
    End Sub

    Private Sub birthdayButton_Click(sender As Object, e As RoutedEventArgs)
      Dim person As Person = DirectCast(Me.FindResource("Tom"), Person)
      person.Age = person.Age + 1
      BindingOperations.GetBindingExpression(ageTextBox, TextBox.TextProperty).UpdateTarget()

      Console.WriteLine(person.Name)
      Console.WriteLine(person.Age)
    End Sub
  End Class
End Namespace
WPF Binding Operations Get Binding Expression








16.95.Binding
16.95.1.Bind to a Property of a UI ElementBind to a Property of a UI Element
16.95.2.Bind a Property of an Element to ItselfBind a Property of an Element to Itself
16.95.3.Specify a Default Value for a BindingSpecify a Default Value for a Binding
16.95.4.Create a Two-Way BindingCreate a Two-Way Binding
16.95.5.Debug Bindings Using Attached PropertiesDebug Bindings Using Attached Properties
16.95.6.String Array ResourceString Array Resource
16.95.7.Bind animate target value to Canvas(Window) widthBind animate target value to Canvas(Window) width
16.95.8.Display Current Date and Time: binding the DateTime.Now to LabelDisplay Current Date and Time: binding the DateTime.Now to Label
16.95.9.One way and two way bindingOne way and two way binding
16.95.10.Custom Element Binding WindowCustom Element Binding Window
16.95.11.Get XmlElement from Bounded viewGet XmlElement from Bounded view
16.95.12.Customize UpdateSourceExceptionFilterCustomize UpdateSourceExceptionFilter
16.95.13.Assign your own class to DataContent and bind to TextBoxAssign your own class to DataContent and bind to TextBox
16.95.14.Async bindingAsync binding
16.95.15.Null property bindingNull property binding
16.95.16.Binding Property with ExceptionBinding Property with Exception
16.95.17.Hierarchical Binding for three level nested objectsHierarchical Binding for three level nested objects
16.95.18.BindingOperations.GetBindingExpressionBindingOperations.GetBindingExpression
16.95.19.Bind to enum typesBind to enum types
16.95.20.Bind to a MethodBind to a Method
16.95.21.Manual Update TargetManual Update Target
16.95.22.Bind to the Values of an EnumerationBind to the Values of an Enumeration
16.95.23.Master Detail BindingMaster Detail Binding
16.95.24.Data binding using collections composed of mixed types of data.Data binding using collections composed of mixed types of data.
16.95.25.Binding Environment InfoBinding Environment Info
16.95.26.Bind to an ADO.NETDataSetBind to an ADO.NETDataSet
16.95.27.Text Data BindingText Data Binding
16.95.28.Bind to an Existing Object InstanceBind to an Existing Object Instance
16.95.29.Digital ClockDigital Clock
16.95.30.Use Data Triggers to Change the Appearance of Bound DataUse Data Triggers to Change the Appearance of Bound Data