BindingGroup.Name 屬性

定義

取得或設定名稱,這個名稱會識別用來包含和排除 BindingGroup 中 Binding 物件的 BindingGroupGets or sets the name that identifies the BindingGroup, which can be used to include and exclude Binding objects in the BindingGroup.

public:
 property System::String ^ Name { System::String ^ get(); void set(System::String ^ value); };
public string Name { get; set; }
member this.Name : string with get, set
Public Property Name As String

屬性值

可識別 BindingGroup 的名稱。The name that identifies the BindingGroup.

範例

下列範例是應用程式的一部分,它會檢查使用者是否已將兩個物件的屬性設定為相等的值。The following examples are part of an application that checks whether the user has set the properties of two objects to equal values. 第一個範例會建立TextBox兩個控制項,其中每個都系結至不同來源的資料。The first example creates two TextBox controls, each of which are data bound to a different source. 第一個TextBox的系結是的一部分BindingGroup ,因為TextBox會從其DataContext父系BindingGroup StackPanel繼承和。The binding of the first TextBox is part of the BindingGroup because the TextBox inherits the DataContext and BindingGroup from its parent StackPanel.

TextBox二個上的系結是的BindingGroup一部分, Name因為BindingGroup的和BindingGroupName Binding的都是設定為bindingGroupThe 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" />

下列範例ValidationRule會顯示上一個範例使用的。The following example shows the ValidationRule that the previous example uses. 在方法中,此範例會BindingGroup從取得每個來源物件,並檢查物件的屬性是否相等。 ValidateIn 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

備註

如果Name DataContextnull,則系結的來源會與具有BindingGroup參與BindingGroup之專案的相同物件。If Name is null, bindings that have a source that is the same object as the DataContext of the element that has the BindingGroup participate in the BindingGroup.

您可以加入具有來源的系結,該系結的DataContext來源與父元素BindingGroup的不同,其方法Name是將BindingGroup的和BindingGroupName系結的屬性設定為相同的值。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. 您可以排除具有與DataContext父元素BindingGroup相同之來源的系結,其方法是將BindingGroupName系結的BindingGroupName屬性設定為不同的值。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.

適用於