FrameworkElement.BindingGroup プロパティ

定義

要素に使用される BindingGroup を取得または設定します。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

プロパティ値

要素に使用される BindingGroupThe BindingGroup that is used for the element.

属性

次の例は、ユーザーが2つのオブジェクトのプロパティを等しい値に設定したかどうかを確認するアプリケーションの一部です。The following examples are part of an application that checks whether the user has set the properties of two objects to equal values. 最初の例では、2つの TextBox コントロールを作成し、それぞれが異なるデータソースにバインドされます。The first example creates two TextBox controls, each of which is bound to a different data source. StackPanel には、2つの文字列が等しいことを確認する ValidationRule を含む BindingGroup があります。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>

次の例では、前の例で使用している ValidationRule を示します。The following example shows the ValidationRule that the previous example uses. Validate メソッドのオーバーライドでは、この例では BindingGroup から各ソースオブジェクトを取得し、オブジェクトのプロパティが等しいかどうかを確認します。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

ValidationRuleを呼び出すには、UpdateSources メソッドを呼び出します。To invoke the ValidationRule, call the UpdateSources method. 次の例では、ボタンの click イベントが発生したときに UpdateSources を呼び出します。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

注釈

BindingGroup を使用すると、オブジェクトの複数のプロパティの値を検証できます。A BindingGroup can be used to validate the values of multiple properties of an object. たとえば、ユーザーにアドレスを入力するように求めるメッセージが表示され、Address型のオブジェクトが設定されているとします。このオブジェクトには、StreetCityZipCodeCountryというプロパティがユーザーが指定した値と共に格納されます。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. このアプリケーションには、4つの TextBox コントロールを含むパネルがあり、それぞれがオブジェクトのプロパティの1つにバインドされています。The application has a panel that contains four TextBox controls, each of which is bound to one of the object's properties. BindingGroup 内の ValidationRule を使用して、Address オブジェクトを検証できます。You can use a ValidationRule in a BindingGroup to validate the Address object. たとえば、ValidationRule は、住所の国/地域に対して郵便番号が有効であることを確認できます。For example, the ValidationRule can ensure that the zip code is valid for the country/region of the address.

子要素は、他の継承可能なプロパティと同様に、親要素から BindingGroup を継承します。Child elements inherit the BindingGroup from their parent elements, just as with any other inheritable property.

依存プロパティ情報Dependency Property Information

識別子フィールドIdentifier field BindingGroupProperty
メタデータプロパティが true に設定されるMetadata properties set to true Inherits

適用対象