Question

我已经编写了这个代码，用于将模板应用到ComboBox。

这是App.xaml上的代码

        <Style x:Key="{x:Type ComboBox}" TargetType="ComboBox" x:Name="selectedStyleTrigger">
            <Setter Property="SnapsToDevicePixels" Value="True"/>
            <Setter Property="OverridesDefaultStyle" Value="True"/>
            <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
            <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
            <Setter Property="ScrollViewer.CanContentScroll" Value="True"/>
            <Setter Property="Width" Value="150"/>
            <Setter Property="MinHeight" Value="20"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="ComboBox">
                        <Grid>
                            <ToggleButton Name="ToggleButton" Template="{StaticResource ComboBoxToggleButton}" Grid.Column="2" 
                                          Focusable="False" IsChecked="{Binding Path=IsDropDownOpen,
                                Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press" />
                            <ContentPresenter Name="ContentSite" IsHitTestVisible="False" Content="{TemplateBinding SelectionBoxItem}" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" Margin="3,3,23,3" VerticalAlignment="Center" HorizontalAlignment="Left" />
                            <TextBox x:Name="PART_EditableTextBox" Style="{x:Null}" Template="{StaticResource ComboBoxTextBox}" 
                                     HorizontalAlignment="Left" VerticalAlignment="Center" Margin="3,3,23,3" 
                                     Focusable="True" Background="Transparent" Foreground="White" 
                                     Visibility="Hidden" IsReadOnly="{TemplateBinding IsReadOnly}" 
                                     Width="250"/>
                            <Popup Name="Popup" Placement="Bottom" IsOpen="{TemplateBinding IsDropDownOpen}" 
                                   AllowsTransparency="True" Focusable="False" PopupAnimation="Slide" 
                                   Width="200">
                                <Grid Name="DropDown" SnapsToDevicePixels="True" 
                                      MinWidth="{TemplateBinding ActualWidth}" MaxHeight="{TemplateBinding MaxDropDownHeight}">
                                    <Border x:Name="DropDownBorder" Background="#004460" BorderThickness="1" BorderBrush="#004460" />
                                    <ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True">
                                        <StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" />
                                    </ScrollViewer>
                                </Grid>
                            </Popup>
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="HasItems" Value="False">
                                <Setter TargetName="DropDownBorder" Property="MinHeight" Value="95"/>
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="False">
                                <Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
                            </Trigger>
                            <Trigger Property="IsGrouping" Value="True">
                                <Setter Property="ScrollViewer.CanContentScroll" Value="False"/>
                            </Trigger>
                            <Trigger SourceName="Popup" Property="Popup.AllowsTransparency" Value="True">
                                <Setter TargetName="DropDownBorder" Property="CornerRadius" Value="0,0,2,2"/>
                                <Setter TargetName="DropDownBorder" Property="Margin" Value="0,-1,0,0"/>
                            </Trigger>
                            <Trigger Property="IsEditable" Value="True">
                                <Setter Property="IsTabStop" Value="False"/>
                                <Setter TargetName="PART_EditableTextBox" Property="Visibility" Value="Visible"/>
                                <Setter TargetName="ContentSite" Property="Visibility" Value="Hidden"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

我有这个类，它扩展了ComboBox：

public class ComboBoxExtends :ComboBox
{
   public LOCAL_PE_AttivitaXParametri parametri { set; get; }
}

现在我以这种方式在Panel上插入ComboBox：

ComboBoxExtends comboBox = new ComboBoxExtends();
comboBox.Style = Resources["selectedStyleTrigger"] as Style;
grid.Children.Add(comboBox);

我将样式“comboBox.Style = Resources [”selectedStyleTrigger“]设置为Style;”但我没有看到这种风格。

我该如何解决？

Reguards

Answer 1

您已为Style创建了ComboBox，并且正在尝试将其应用于不是ComboBoxExtends的自定义ComboBox课程。为了为您的自定义类声明Style，您需要添加一个XML命名空间前缀，该前缀指向声明它的程序集......可能是这样的：

xmlns:Local="clr-namespace:YourAppName.OptionalFolderName"

然后您可以使用此前缀引用您的自定义类：

<Style TargetType="Local:ComboBoxExtends" x:Key="selectedStyleTrigger">
    ...
</Style>

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