Question

我遇到了多重绑定WPF AutoCompleteBox的问题。我是多绑定到FirstNameTextBox和LastNameTextBox文本属性，如图所示和MainWindow。在我的转换器中，我正在尝试访问始终返回Nothing的AutoCompleteBox.Text。我也尝试过SelectedItem，并且没有返回任何内容而不是用户输入的文本。有什么建议？感谢

<my1:AutoCompleteBox IsTextCompletionEnabled="True" FilterMode="StartsWith" TextBoxBase.TextChanged="CompanySearchTBox_TextChanged" Height="23" VerticalAlignment="Center" HorizontalAlignment="Stretch" Name="companyNameTBox" Grid.Row="6" Grid.ColumnSpan="2" Margin="119,0,1,0">
        <my1:AutoCompleteBox.Text>
           <MultiBinding Converter="{StaticResource multiTextBoxConverter}" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged">
              <MultiBinding.Bindings>
                <Binding ElementName="firstNameTBox" Path="Text" />
                <Binding ElementName="lastNameTBox" Path="Text" />
                <Binding Path="DataContext" RelativeSource="{RelativeSource AncestorType={x:Type Window}}" />
              </MultiBinding.Bindings>                            
           </MultiBinding>
        </my1:AutoCompleteBox.Text>
</my1:AutoCompleteBox>

在我的转换器中 我从参数中获取对MainWindow的引用，并尝试获取始终返回Nothing的AutoCompleteBox.Text。有什么建议？感谢

 mainWindow = CType(values.ElementAt(2), MainWindow)
 _logicalName = mainWindow.companyNameTBox.Text

更新了MultiTextBoxConverter.Convert

Public Function Convert(ByVal values() As Object, ByVal targetType As System.Type,        ByVal parameter As Object, ByVal culture As System.Globalization.CultureInfo) As Object Implements System.Windows.Data.IMultiValueConverter.Convert
        Dim firstname = values.ElementAt(0).ToString
        Dim lastname = values.ElementAt(1).ToString
        Dim mainWindow As MainWindow, _logicalName As String = Nothing
        Dim clientInfo As Jewellery.ClientInfo = Nothing          

        If Not TryCast(values.ElementAt(2), MainWindow) Is Nothing Then
            mainWindow = CType(values.ElementAt(2), MainWindow)
            clientInfo = CType(mainWindow.FormGrid.DataContext, Jewellery.ClientInfo)
            If Not clientInfo Is Nothing Then
                If mainWindow.IsChecked = True Then
                    _logicalName = firstname + " " + lastname
                Else
                    _logicalName = mainWindow.companyNameTBox.Text

                End If

            End If
            If Not clientInfo Is Nothing Then clientInfo.Company.CompanyName = _logicalName
        End If
        Return _logicalName
    End Function
 Public Function ConvertBack(ByVal value As Object, ByVal targetTypes() As System.Type, ByVal parameter As Object, ByVal culture As System.Globalization.CultureInfo) As Object() Implements System.Windows.Data.IMultiValueConverter.ConvertBack
        Dim obj(3) As Object
        obj(0) = Binding.DoNothing
        obj(1) = Binding.DoNothing
        obj(2) = Binding.DoNothing
        Return obj
    End Function

基本上它正在测试是否选中了复选框，如果为true，则返回_logicalName = FirstName +“”+ LastName，否则返回AutoCompleteBox.Text

解决方案

 Public Function ConvertBack(ByVal value As Object, ByVal targetTypes() As System.Type, ByVal parameter As Object, ByVal culture As System.Globalization.CultureInfo) As Object() Implements System.Windows.Data.IMultiValueConverter.ConvertBack
        Dim obj(3) As Object
        obj(0) = Binding.DoNothing
        obj(1) = Binding.DoNothing
        ****obj(2) = Binding.SourceUpdatedEvent****
        Return obj
    End Function
<!-- Added this as 3rd parameter to Multibinding code above -->
<Binding RelativeSource="{RelativeSource Self}" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" Path="Text" />

WPF AutocompleteBox多重绑定

0 个答案: