Comment : créer une liaison dans du codeHow to: Create a Binding in Code

Cet exemple montre comment créer et définir une Binding dans le code.This example shows how to create and set a Binding in code.

ExempleExample

La classe FrameworkElement et la classe FrameworkContentElement exposent toutes deux une méthode SetBinding.The FrameworkElement class and the FrameworkContentElement class both expose a SetBinding method. Si vous liez un élément qui hérite de l’une de ces classes, vous pouvez appeler directement la méthode SetBinding.If you are binding an element that inherits either of these classes, you can call the SetBinding method directly.

L’exemple suivant crée une classe nommée, MyData, qui contient une propriété nommée MyDataProperty.The following example creates a class named, MyData, which contains a property named MyDataProperty.

public class MyData : INotifyPropertyChanged
{
    private string myDataProperty;

    public MyData() { }

    public MyData(DateTime dateTime)
    {
        myDataProperty = "Last bound time was " + dateTime.ToLongTimeString();
    }

    public String MyDataProperty
    {
        get { return myDataProperty; }
        set
        {
            myDataProperty = value;
            OnPropertyChanged("MyDataProperty");
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
    
    private void OnPropertyChanged(string info)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(info));
        }
    }
}
Public Class MyData
    Implements INotifyPropertyChanged

    ' Events
    Public Event PropertyChanged As PropertyChangedEventHandler _
        Implements INotifyPropertyChanged.PropertyChanged

    ' Methods
    Public Sub New()
    End Sub

    Public Sub New(ByVal dateTime As DateTime)
        Me.MyDataProperty = ("Last bound time was " & dateTime.ToLongTimeString)
    End Sub

    Private Sub OnPropertyChanged(ByVal info As String)
        RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(info))
    End Sub


    ' Properties
    Public Property MyDataProperty As String
        Get
            Return Me._myDataProperty
        End Get
        Set(ByVal value As String)
            Me._myDataProperty = value
            Me.OnPropertyChanged("MyDataProperty")
        End Set
    End Property


    ' Fields
    Private _myDataProperty As String
End Class

L’exemple suivant montre comment créer un objet de liaison pour définir la source de la liaison.The following example shows how to create a binding object to set the source of the binding. L’exemple utilise SetBinding pour lier la propriété Text de myText, qui est un contrôle TextBlock, à MyDataProperty.The example uses SetBinding to bind the Text property of myText, which is a TextBlock control, to MyDataProperty.

// Make a new source.
MyData myDataObject = new MyData(DateTime.Now);      
Binding myBinding = new Binding("MyDataProperty");
myBinding.Source = myDataObject;
// Bind the new data source to the myText TextBlock control's Text dependency property.
myText.SetBinding(TextBlock.TextProperty, myBinding);
' Make a new source.
Dim data1 As New MyData(DateTime.Now)
Dim binding1 As New Binding("MyDataProperty")
binding1.Source = data1
' Bind the new data source to the myText TextBlock control's Text dependency property.
Me.myText.SetBinding(TextBlock.TextProperty, binding1)

Pour obtenir l’exemple de code complet, consultez exemple de liaison de code uniquement.For the complete code sample, see Code-only Binding Sample.

Au lieu d’appeler SetBinding, vous pouvez utiliser la méthode statique SetBinding de la classe BindingOperations.Instead of calling SetBinding, you can use the SetBinding static method of the BindingOperations class. L’exemple suivant appelle BindingOperations.SetBinding au lieu de FrameworkElement.SetBinding pour lier myText à myDataProperty.The following example, calls BindingOperations.SetBinding instead of FrameworkElement.SetBinding to bind myText to myDataProperty.

//make a new source
MyData myDataObject = new MyData(DateTime.Now);
Binding myBinding = new Binding("MyDataProperty");
myBinding.Source = myDataObject;
BindingOperations.SetBinding(myText, TextBlock.TextProperty, myBinding);
Dim myDataObject As New MyData(DateTime.Now)
Dim myBinding As New Binding("MyDataProperty")
myBinding.Source = myDataObject
BindingOperations.SetBinding(myText, TextBlock.TextProperty, myBinding)

Voir aussiSee also