更改WPF DataGrid列标题样式，代码中的菜单可见性？ [英] Change WPF DataGrid Column Header Style, Menu Visibility in Code Behind?

问题描述

我有以下样式（在xaml中定义为资源）。这基本上是一个DataGridColumnHeaderStyle，具有实现行过滤的菜单。它被分配给DataGrid使用：ColumnHeaderStyle ={StaticResource lclDataGridColumnHeaders}

I have the following "Style" (defined as a Resource in xaml). This is basically a "DataGridColumnHeaderStyle" with a Menu that implements Row filtering. It is assigned to the DataGrid using: ColumnHeaderStyle="{StaticResource lclDataGridColumnHeaders}"

有时候在代码后面我需要禁用（行过滤）菜单（menuColumnOptions） ，这是在这种风格定义。任何人都可以告诉我如何访问这个元素，所以我可以通过C＃更改其可见性？

There are times in Code Behind I need to disable the (row filtering) Menu (menuColumnOptions), which is defined in this Style. Can anyone tell me how to access this element so I can change its Visibility via C#?

我尝试过：myDataGrid.Template.FindName（menuColumnOptions），但我收到一个错误，关于它的事情必须应用...

I tried: myDataGrid.Template.FindName("menuColumnOptions") but I received an error, something about it must be "applied"...

（我想替代解决方案是创建一个重复的样式，没有此菜单，并更改所有的列使用这种风格...）

(I suppose the alternative solution is to create a duplicate "Style" WITHOUT this Menu and change all the Columns to use that style...)

<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>

推荐答案

这是我最后做的。

我复制了样式，并从此副本中删除了菜单。

I copied the Style and removed the Menu from this Copy.

然后，在代码中我只是使用以下设置：

Then, in code I just set it using:

myDataGrid.ColumnHeaderStyle =（Style）FindResource lclDataGridLockedColumnHeaders）;

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

这篇关于更改WPF DataGrid列标题样式，代码中的菜单可见性？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！