Question

我对WPF比较陌生，有时会让我的头脑爆炸。但是，我确实喜欢它背后的力量，特别是当与MVVM模型一起使用时。

我的ControlTemplate包含Button。我在自定义控件中使用ControlTemplate。我想在自定义控件上添加一个属性，该属性将绑定到Button内ControlTemplate的命令属性。基本上，它是ComboBox，右侧有Button，允许用户弹出搜索对话框。由于此控件可能多次出现在用户控件上，因此我需要能够将每个控件绑定到不同的命令（搜索产品，搜索客户等）。

但是，我一直无法弄清楚如何做到这一点。

以下是一些示例XAML：




        
            
        
    

<Style TargetType="{x:Type m:SelectionFieldControl}">
    <Setter Property="LookupTemplate" Value="{StaticResource LookupTemplate}" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type m:SelectionFieldControl}">
                <Border BorderThickness="{TemplateBinding Border.BorderThickness}" 
                            Padding="{TemplateBinding Control.Padding}" 
                            BorderBrush="{TemplateBinding Border.BorderBrush}" 
                            Background="{TemplateBinding Panel.Background}" 
                            SnapsToDevicePixels="True"
                            Focusable="False">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto" MinWidth="0" 
                                              SharedSizeGroup="{Binding LabelShareSizeGroupName, 
                                                                        RelativeSource={RelativeSource FindAncestor, 
                                                                               AncestorType={x:Type m:BaseFieldControl}}}" />
                            <ColumnDefinition Width="1*" />
                            <ColumnDefinition Width="Auto" 
                                              SharedSizeGroup="{Binding WidgetsShareSizeGroupName, 
                                                                        RelativeSource={RelativeSource FindAncestor, 
                                                                               AncestorType={x:Type m:BaseFieldControl}}}" />
                        </Grid.ColumnDefinitions>

                        <!-- Customized Value Part -->
                        <ComboBox x:Name="PART_Value" 
                                  Grid.Column="1"
                                  Margin="4,2,0,1" 
                                  SelectedValue="{Binding Path=SelectionField.Value, 
                                                          RelativeSource={RelativeSource FindAncestor, 
                                                                                         AncestorType={x:Type m:SelectionFieldControl}}}"

                                  IsEnabled="{Binding Field.IsNotReadOnly,
                                                      RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type m:SelectionFieldControl}}}"
                                  Visibility="{Binding Field.IsInEditMode, Converter={StaticResource TrueToVisible},
                                                       RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type m:SelectionFieldControl}}}"

                                  FontFamily="{StaticResource FontFamily_Default}" FontSize="11px">
                            <ComboBox.ItemsPanel>
                                <ItemsPanelTemplate>
                                    <VirtualizingStackPanel IsVirtualizing="True" 
                                                            VirtualizationMode="Recycling"/>
                                </ItemsPanelTemplate>
                            </ComboBox.ItemsPanel>
                        </ComboBox>

                        <StackPanel Grid.Column="2" 
                                    Orientation="Horizontal" 
                                    Name="PART_Extra"
                                    Focusable="False">

                            <ContentControl Name="PART_LookupContent"
                                            Template="{Binding LookupTemplate, 
                                                               RelativeSource={RelativeSource FindAncestor, 
                                                                                              AncestorType={x:Type m:SelectionFieldControl}}}" 
                                            Focusable="False"/>
                        </StackPanel>
                    </Grid>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

我以为我可以通过做这样的事情来实现它：

但它不起作用。

非常感谢任何帮助。

Answer 1

卫生署！

这确实有效。问题是我的依赖属性在注册属性时没有使用UIPropertyMetadata作为属性Meta数据。

public ICommand ShowSearchCommand { get { return (ICommand)GetValue(ShowSearchCommandProperty); } set { SetValue(ShowSearchCommandProperty, value); } }



    public static readonly DependencyProperty ShowSearchCommandProperty =
        DependencyProperty.Register("ShowSearchCommand", typeof(ICommand),
            typeof(SelectionFieldControl),
            new UIPropertyMetadata(OnShowSearchCommandChanged));

    static void OnShowSearchCommandChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {

    }

public static readonly DependencyProperty ShowSearchCommandProperty = DependencyProperty.Register("ShowSearchCommand", typeof(ICommand), typeof(SelectionFieldControl), new UIPropertyMetadata(OnShowSearchCommandChanged)); static void OnShowSearchCommandChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e) { }

在WPF中，如何在控制模板中获取命令以绑定到父级中的属性？

1 个答案: