更改 WPF DataGrid 列标题样式、代码隐藏中的菜单可见性？

Question

我有以下“样式”（在 xaml 中定义为资源）。这基本上是一个带有实现行过滤的菜单的“DataGridColumnHeaderStyle”。它使用以下方式分配给 DataGrid： ColumnHeaderStyle="{StaticResource lclDataGridColumnHeaders}"

在代码隐藏中有时我需要禁用在此样式中定义的（行过滤）菜单 (menuColumnOptions)。谁能告诉我如何访问此元素，以便我可以通过 C# 更改其可见性？

我尝试过： myDataGrid.Template.FindName("menuColumnOptions") 但我收到一个错误，必须“应用”有关它的某些内容...

（我想替代解决方案是创建一个重复的“样式”而不使用此菜单并更改所有使用该样式的列...）

<Style x:Key="lclDataGridColumnHeaders" TargetType="{x:Type DataGridColumnHeader}">
<Setter Property="Foreground" Value="{StaticResource appTextColor}"/>
<Setter Property="FontWeight" Value="DemiBold"/>
<Setter Property="Template">
    <Setter.Value>
        <ControlTemplate TargetType="{x:Type DataGridColumnHeader}">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="Auto" />
                    <ColumnDefinition Width="Auto" />
                </Grid.ColumnDefinitions>

                <Border x:Name="BackgroundBorder"
                        BorderThickness="0,1,0,1" 
                        Background="{StaticResource lclDataGridHeaderBackground}" 
                        BorderBrush="Transparent" 
                        Grid.ColumnSpan="2" />

                <ContentPresenter Margin="6,3,6,3" VerticalAlignment="Center" />

                <Path Grid.Column="1" x:Name="SortArrow" Visibility="Collapsed" Data="M0,0 L1,0 0.5,1 z" 
                        Width="8" Height="6" Fill="Gray" Stretch="Fill" Margin="0,0,8,0"
                        VerticalAlignment="Center" RenderTransformOrigin="0.5,0.4" />


                <Menu Grid.Column="3" x:Name="menuColumnOptions" VerticalAlignment="Center" Background="#FFF9F9F7" HorizontalAlignment="Right" >
                    <MenuItem Padding="0" SubmenuOpened="MenuItemColumnOptions_SubmenuOpened">
                        <MenuItem.Header>
                            <Border BorderBrush="{StaticResource appTextColor}" BorderThickness="1" CornerRadius="2" Height="20" Width="20" >
                                <Path Data="M0,0 L1,0 0.5,1 z" Stretch="Fill" Fill="{StaticResource appTextColor}"
                                        Width="10" Height="8" VerticalAlignment="Center" RenderTransformOrigin="0.5,0.4" Margin="2,0"/>
                            </Border>
                        </MenuItem.Header>
                        <MenuItem x:Name="clearFilterMenuItem" Header="Clear Filter..." Click="ClearFilter_Click" IsEnabled="False">
                            <MenuItem.Icon>
                                <Image Source="/IngramBook.WpfTableEditor;component/Images/edit_undohs.png" Width="16" Height="16"/>
                            </MenuItem.Icon>
                        </MenuItem>
                        <Separator />
                        <MenuItem Header="Equals..." Click="CustomAutoFilter_Click" />
                        <MenuItem Header="Does Not Equal..." Click="CustomAutoFilter_Click"/>
                        <Separator />
                        <MenuItem Header="Begins With..." Click="CustomAutoFilter_Click"/>
                        <MenuItem Header="Ends With..." Click="CustomAutoFilter_Click"/>
                        <Separator />
                        <MenuItem Header="Contains..." Click="CustomAutoFilter_Click" />
                        <MenuItem Header="Does Not Contain..." Click="CustomAutoFilter_Click"/>
                        <Separator />
                        <MenuItem Header="Custom Filter..." Click="CustomAutoFilter_Click">
                            <MenuItem.Icon>
                                <Image Source="/IngramBook.WpfTableEditor;component/Images/Filter2HS.png" Width="16" Height="16"/>
                            </MenuItem.Icon>
                        </MenuItem>
                        <Separator />
                        <MenuItem Header="Select Individual Values..." Click="SelectIndividualItems_Click">
                            <MenuItem.Icon>
                                <Image Source="/IngramBook.WpfTableEditor;component/Images/checkboxhs.png" Width="16" Height="16"/>
                            </MenuItem.Icon>
                        </MenuItem>
                        <Separator />
                        <MenuItem Header="Trim Trailing White Spaces..." Click="TrimTrailingWhiteSpaces_Click"/>
                        <MenuItem Header="Capitalization" >
                            <MenuItem.Icon>
                                <Image Source="/IngramBook.WpfTableEditor;component/Images/FontHS.png" Width="16" Height="16"/>
                            </MenuItem.Icon>
                            <MenuItem Header="Capitalize Each Word" Click="CapitalizeEachWord_Click"/>
                            <MenuItem Header="UPPERCASE" Click="Uppercase_Click"/>
                            <MenuItem Header="lowercase" Click="Lowercase_Click"/>
                        </MenuItem>
                        <Separator />
                        <MenuItem Header="Hide Column" Click="HideColumn_Click"/>
                        <Separator />
                        <MenuItem x:Name="deleteColumnMenuItem" Header="Delete Column" Click="dropColumnButton_Click">
                            <MenuItem.Icon>
                                <Image Source="/IngramBook.WpfTableEditor;component/Images/DeleteHS.png" Width="16" Height="16"/>
                            </MenuItem.Icon>
                        </MenuItem>
                    </MenuItem>
                </Menu>

                <Thumb x:Name="PART_LeftHeaderGripper" HorizontalAlignment="Left" Style="{StaticResource ColumnHeaderGripperStyle}"/>
                <Thumb x:Name="PART_RightHeaderGripper" HorizontalAlignment="Right" Style="{StaticResource ColumnHeaderGripperStyle}"/>
            </Grid>
            <ControlTemplate.Triggers>
                <Trigger Property="SortDirection" Value="Ascending">
                    <Setter TargetName="SortArrow" Property="Visibility" Value="Visible" />
                    <Setter TargetName="SortArrow" Property="RenderTransform">
                        <Setter.Value>
                            <RotateTransform Angle="180" />
                        </Setter.Value>
                    </Setter>
                </Trigger>
                <Trigger Property="SortDirection" Value="Descending">
                    <Setter TargetName="SortArrow" Property="Visibility" Value="Visible" />
                </Trigger>
                <Trigger Property="SortDirection" Value="{x:Null}">
                    <Setter TargetName="SortArrow" Property="Visibility" Value="Collapsed" />
                </Trigger>
                <Trigger Property="DisplayIndex" Value="0">
                    <Setter Property="Visibility" Value="Collapsed" TargetName="PART_LeftHeaderGripper" />
                </Trigger>
                <Trigger Property="IsMouseOver" Value="True" >
                    <Setter Property="Background" TargetName="BackgroundBorder" Value="{StaticResource appButtonBackgroundHighlight}" />
                    <Setter Property="BorderBrush" TargetName="BackgroundBorder" Value="Transparent" />
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
    </Setter.Value>
</Setter>

Answer 1

您是否能够为 DataGridColumnHeader 类创建一个附加属性（类型布尔值或可见性）并将菜单的 Enabled 或 Visibility 属性绑定到该附加属性？

http://www.deepcode.co.uk /2008/08/exusing-new-properties-for-control_15.html

编辑：

My thought is that an attached property is going to be simpler as you could just set the visibility in XAML, but I tried a quick test and I think the method you are trying to use should work just as well.

Menu myMenu = (Menu)this.myDataGrid.Template.FindName("menuColumnOptions", this.myDataGrid);
menu.Visibility = System.Windows.Visibility.Hidden;

如果您收到错误，您能否在后面的代码中显示您尝试设置可见性的代码？听起来您可能会在完全构建之前尝试访问 DataGridColumnHeader 的模板（在这种情况下，将代码移至 Loaded 事件可能会解决您的问题）。

编辑2：

<Window x:Class="TestApp11.MainWindow" 
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
  xmlns:l="clr-namespace:TestApp11"
  xmlns:s="clr-namespace:System;assembly=mscorlib"
  Title="Window1" Height="500" Width="800">
    <Grid>
        <Grid.Resources>
            <Style x:Key="MyButtonStyle" TargetType="Button">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type Button}">
                            <Border BorderBrush="Red" BorderThickness="2">
                                <StackPanel>
                                    <TextBlock x:Name="MyTextBlock" Text="Control Template's TextBlock 1" />
                                    <ContentPresenter />
                                    <TextBlock Text="Control Template's TextBlock 2" />
                                </StackPanel>
                            </Border>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </Grid.Resources>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Button x:Name="scottsButton" Style="{StaticResource MyButtonStyle}">
            <TextBlock Text="This Text should appear where the Control Template's ContentPresenter is located."/>
        </Button>
        <Button Grid.Row="1" Content="Click to hide visibility of TextBlock1" Click="Button_Click" />
    </Grid>
</Window>

背后代码：

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        TextBlock tb = (TextBlock)this.scottsButton.Template.FindName("MyTextBlock", this.scottsButton);
        tb.Visibility = System.Windows.Visibility.Hidden;
    }
}

Answer 2

这就是我最终所做的。

我复制了样式并从此副本中删除了菜单。

然后，在代码中我只是使用以下方法设置它：

myDataGrid.ColumnHeaderStyle = (Style)FindResource("lclDataGridLockedColumnHeaders");