FrameworkElement.BindingGroup FrameworkElement.BindingGroup FrameworkElement.BindingGroup FrameworkElement.BindingGroup Property

Définition

Obtient ou définit le BindingGroup utilisé pour l'élément.Gets or sets the BindingGroup that is used for the element.

public:
 property System::Windows::Data::BindingGroup ^ BindingGroup { System::Windows::Data::BindingGroup ^ get(); void set(System::Windows::Data::BindingGroup ^ value); };
[System.Windows.Localizability(System.Windows.LocalizationCategory.NeverLocalize)]
public System.Windows.Data.BindingGroup BindingGroup { get; set; }
member this.BindingGroup : System.Windows.Data.BindingGroup with get, set
Public Property BindingGroup As BindingGroup

Valeur de propriété

BindingGroup utilisé pour l'élément.The BindingGroup that is used for the element.

Exemples

Les exemples suivants font partie d’une application qui vérifie si l’utilisateur a défini les propriétés de deux objets de valeurs identiques.The following examples are part of an application that checks whether the user has set the properties of two objects to equal values. Le premier exemple crée deux TextBox contrôles, chacun d’eux est lié à une autre source de données.The first example creates two TextBox controls, each of which is bound to a different data source. Le StackPanel a un BindingGroup qui contient un ValidationRule qui vérifie que les deux chaînes sont égales.The StackPanel has a BindingGroup that contains a ValidationRule that checks that the two strings are equal.

<StackPanel>
  <StackPanel.Resources>
    <src:Type1 x:Key="object1" />
    <src:Type2 x:Key="object2" />
  </StackPanel.Resources>

  <StackPanel Name="sp1"
              Margin="5"
              DataContext="{Binding Source={StaticResource object1}}"
              Validation.ValidationAdornerSite="{Binding ElementName=label1}"
              Orientation="Horizontal"
              HorizontalAlignment="Center">

    <StackPanel.BindingGroup>
      <BindingGroup Name="bindingGroup">
        <BindingGroup.ValidationRules>
          <src:BindingGroupValidationRule ValidatesOnTargetUpdated="True" />
        </BindingGroup.ValidationRules>
      </BindingGroup>
    </StackPanel.BindingGroup>

    <TextBlock Text="First string" />

    <TextBox Width="150"
             Text="{Binding Path=PropertyA}" />

    <TextBlock Text="Second string" />

    <TextBox Width="150"
             Text="{Binding Source={StaticResource object2}, 
      Path=PropertyB, BindingGroupName=bindingGroup, 
      TargetNullValue=please enter a string}" />

  </StackPanel>

  <Label Name="label1"
         Content="{Binding ElementName=sp1, Path=(Validation.Errors)[0].ErrorContent}"
         Margin="5"
         Foreground="Red"
         HorizontalAlignment="Center" />

  <Button HorizontalAlignment="Center"
          Click="Button_Click"
          IsDefault="True">
    _Submit
  </Button>

  <StackPanel Orientation="Horizontal">
    <TextBlock Text="First string:"
               FontWeight="Bold" />
    <TextBlock Text="{Binding Source={StaticResource object1}, 
      Path=PropertyA, TargetNullValue=--}" />
  </StackPanel>

  <StackPanel Orientation="Horizontal">
    <TextBlock Text="Second string:"
               FontWeight="Bold" />
    <TextBlock Text="{Binding Source={StaticResource object2}, 
      Path=PropertyB, TargetNullValue=--}" />
  </StackPanel>
</StackPanel>

L’exemple suivant montre le ValidationRule qui utilise l’exemple précédent.The following example shows the ValidationRule that the previous example uses. Dans le Validate substitution de méthode, l’exemple obtient chaque objet source à partir de la BindingGroup et vérifie si les propriétés des objets sont égale.In the Validate method override, the example gets each source object from the BindingGroup and checks whether the properties of the objects are equal.

public class Type1
{
    public string PropertyA { get; set; }

    public Type1()
    {
        PropertyA = "Default Value";
    }
}

public class Type2
{
    public string PropertyB { get; set; }

    public Type2()
    {
    }
}

public class BindingGroupValidationRule : ValidationRule
{
    public override ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo)
    {
        BindingGroup bg = value as BindingGroup;

        Type1 object1 = null;
        Type2 object2 = null;

        foreach (object item in bg.Items)
        {
            if (item is Type1)
            {
                object1 = item as Type1;
            }

            if (item is Type2)
            {
                object2 = item as Type2;
            }
        }

        if (object1 == null || object2 == null)
        {
            return new ValidationResult(false, "BindingGroup did not find source object.");
        }

        string string1 = bg.GetValue(object1, "PropertyA") as string;
        string string2 = bg.GetValue(object2, "PropertyB") as string;

        if (string1 != string2)
        {
            return new ValidationResult(false, "The two strings must be identical.");
        }

        return ValidationResult.ValidResult;

    }

}
Public Class Type1
    Public Property PropertyA() As String

    Public Sub New()
        PropertyA = "Default Value"
    End Sub
End Class

Public Class Type2
    Public Property PropertyB() As String

    Public Sub New()
    End Sub
End Class

Public Class BindingGroupValidationRule
    Inherits ValidationRule
    Public Overrides Function Validate(ByVal value As Object, ByVal cultureInfo As System.Globalization.CultureInfo) As ValidationResult
        Dim bg As BindingGroup = TryCast(value, BindingGroup)

        Dim object1 As Type1 = Nothing
        Dim object2 As Type2 = Nothing

        For Each item As Object In bg.Items
            If TypeOf item Is Type1 Then
                object1 = TryCast(item, Type1)
            End If

            If TypeOf item Is Type2 Then
                object2 = TryCast(item, Type2)
            End If
        Next item

        If object1 Is Nothing OrElse object2 Is Nothing Then
            Return New ValidationResult(False, "BindingGroup did not find source object.")
        End If

        Dim string1 As String = TryCast(bg.GetValue(object1, "PropertyA"), String)
        Dim string2 As String = TryCast(bg.GetValue(object2, "PropertyB"), String)

        If string1 <> string2 Then
            Return New ValidationResult(False, "The two strings must be identical.")
        End If

        Return ValidationResult.ValidResult

    End Function

End Class

Pour appeler le ValidationRule, appelez le UpdateSources (méthode).To invoke the ValidationRule, call the UpdateSources method. L’exemple suivant appelle UpdateSources lorsque l’événement click du bouton se produit.The following example calls UpdateSources when the click event of the button occurs.

private void Button_Click(object sender, RoutedEventArgs e)
{
    sp1.BindingGroup.UpdateSources();
}
Private Sub Button_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
    sp1.BindingGroup.UpdateSources()
End Sub

Remarques

Un BindingGroup peut être utilisé pour valider les valeurs de plusieurs propriétés d’un objet.A BindingGroup can be used to validate the values of multiple properties of an object. Par exemple, supposons qu’une application invite l’utilisateur à entrer une adresse et remplit ensuite un objet de type Address, qui a les propriétés Street, City, ZipCode, et Country, avec les valeurs que l’utilisateur fourni.For example, suppose that an application prompts the user to enter an address and then populates an object of type Address, which has the properties Street, City, ZipCode, and Country, with the values that the user provided. L’application a un panneau qui contient quatre TextBox contrôles, chacun d’eux est lié à une des propriétés de l’objet.The application has a panel that contains four TextBox controls, each of which is bound to one of the object's properties. Vous pouvez utiliser un ValidationRule dans un BindingGroup pour valider le Address objet.You can use a ValidationRule in a BindingGroup to validate the Address object. Par exemple, le ValidationRule pouvez vous assurer que le code postal est valide pour le pays/région de l’adresse.For example, the ValidationRule can ensure that the zip code is valid for the country/region of the address.

Les éléments enfants héritent le BindingGroup à partir de leurs éléments parents, tout comme avec toute autre propriété pouvant être héritées.Child elements inherit the BindingGroup from their parent elements, just as with any other inheritable property.

Informations sur les propriétés de dépendanceDependency Property Information

Champ d’identificateurIdentifier field BindingGroupProperty
La valeur des propriétés de métadonnées trueMetadata properties set to true Inherits

S’applique à