BindingBase.BindingGroupName プロパティ
定義
そのバインディングが属している BindingGroup の名前を取得または設定します。Gets or sets the name of the BindingGroup to which this binding belongs.
public:
property System::String ^ BindingGroupName { System::String ^ get(); void set(System::String ^ value); };public string BindingGroupName { get; set; }member this.BindingGroupName : string with get, setPublic Property BindingGroupName As Stringプロパティ値
そのバインディングが属している BindingGroup の名前。The name of the BindingGroup to which this binding belongs.
例
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 TextBox のコントロールを作成し、それぞれが異なるソースにデータをバインドします。は、とを継承しているため、最初ののバインドは TextBox に含まれています。 BindingGroup TextBox DataContext BindingGroupStackPanelThe first example creates two TextBox controls, each of which is data bound to a different source: The binding of the first TextBox is part of the BindingGroup because the TextBox inherits the DataContext and BindingGroup from its parent StackPanel
のとのは TextBox BindingGroup Name BindingGroup BindingGroupName 両方と Binding もに設定さ bindingGroup れているため、2番目ののバインディングはの一部です。The binding on the second TextBox is part of the BindingGroup because the Name of the BindingGroup and the BindingGroupName of the Binding are both set to bindingGroup.
<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" />
次の例は、前の例で使用しているを示して ValidationRule います。The following example shows the ValidationRule that the previous example uses. メソッドでは、 Validate から各ソースオブジェクトを取得し、 BindingGroup 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, 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
注釈
BindingGroupNameが設定されていない場合、バインディング BindingGroup のソースおよびがある DataContext 親要素のが同じオブジェクトである場合にのみ、バインディングはに属し BindingGroup ます。If BindingGroupName is not set, the binding belongs to a BindingGroup only if the binding's source and the DataContext of the parent element that has the BindingGroup are the same object.
BindingGroupNameが値に設定されている場合、次の条件に該当する場合、バインディングはに属し BindingGroup ます。If BindingGroupName is set to a value, the binding belongs to a BindingGroup if the following conditions are true:
Nameとのが BindingGroup BindingGroupName 等価です。The Name of the BindingGroup and BindingGroupName are equal.
は、 BindingGroup バインディングの target 要素の親要素に属しています。The BindingGroup belongs to a parent element of the binding's target element.
BindingGroupNameがに設定されている場合、 null バインディングはの一部ではありません BindingGroup 。If BindingGroupName is set to null, the binding is never a part of a BindingGroup.
を持つ親要素のとは異なるソースを持つバインディングを含めることができます。これには、 DataContext BindingGroup Name BindingGroup BindingGroupName バインドのとのプロパティを同じ値に設定します。You can include bindings that have a source that is different from the DataContext of the parent element that has the BindingGroup by setting Name of the BindingGroup and the BindingGroupName property of a binding to the same value. を持つ親要素のと同じソースを持つバインディングを除外するには、 DataContext BindingGroup Name BindingGroup BindingGroupName バインディングのプロパティを別の値に設定します。You can exclude bindings that have the same source as DataContext of the parent element that has the BindingGroup by setting Name of the BindingGroup and the BindingGroupName property of a binding to different values.