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

Definición

Obtiene o establece el BindingGroup que se usa para el elemento.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

Valor de propiedad

Objeto BindingGroup que se usa para el elemento.The BindingGroup that is used for the element.

Ejemplos

Los ejemplos siguientes forman parte de una aplicación que comprueba si el usuario ha establecido las propiedades de dos objetos en los mismos valores.The following examples are part of an application that checks whether the user has set the properties of two objects to equal values. El primer ejemplo crea dos TextBox controles, cada uno de los cuales está enlazado a un origen de datos diferente.The first example creates two TextBox controls, each of which is bound to a different data source. El StackPanel tiene un BindingGroup que contiene un ValidationRule que comprueba que las dos cadenas son iguales.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>

El ejemplo siguiente se muestra el ValidationRule que utiliza el ejemplo anterior.The following example shows the ValidationRule that the previous example uses. En el Validate invalidación del método, el ejemplo obtiene cada objeto de origen desde el BindingGroup y comprueba si las propiedades de los objetos son iguales.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

Para invocar el ValidationRule, llame a la UpdateSources método.To invoke the ValidationRule, call the UpdateSources method. El ejemplo siguiente se llama UpdateSources cuando se produce el evento click del botón.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

Comentarios

Un BindingGroup puede usarse para validar los valores de varias propiedades de un objeto.A BindingGroup can be used to validate the values of multiple properties of an object. Por ejemplo, suponga que una aplicación solicita al usuario que escriba una dirección y, a continuación, rellena un objeto de tipo Address, que tiene las propiedades Street, City, ZipCode, y Country, con los valores que el usuario proporcionado.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. La aplicación tiene un panel que contiene cuatro TextBox controles, cada uno de los cuales está enlazado a una de las propiedades del objeto.The application has a panel that contains four TextBox controls, each of which is bound to one of the object's properties. Puede usar un ValidationRule en un BindingGroup para validar la Address objeto.You can use a ValidationRule in a BindingGroup to validate the Address object. Por ejemplo, el ValidationRule puede asegurarse de que el código postal es válido para el país o región de la dirección.For example, the ValidationRule can ensure that the zip code is valid for the country/region of the address.

Los elementos secundarios heredan la BindingGroup de sus elementos primarios, al igual que con cualquier otra propiedad heredable.Child elements inherit the BindingGroup from their parent elements, just as with any other inheritable property.

Información sobre propiedades de dependenciaDependency Property Information

Campo de identificadorIdentifier field BindingGroupProperty
Establecen las propiedades de metadatos en trueMetadata properties set to true Inherits

Se aplica a