以编程方式将 Column 添加到 Datagrid，在选择时保持蓝色背景样式

Question

我的 Window 上有一个数据网格，在 XAML 中添加了 2 列，在后面的代码中添加了 1 列。通过添加背景设置为 null 的 DataGridCell 样式，我设法从前 2 列中删除了蓝色。但是在后面的代码中我无法让它工作。

这是Window.xaml

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:System="clr-namespace:System;assembly=mscorlib" x:Class="WpfApp1.MainWindow"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Window.Resources>
        <Style TargetType="{x:Type DataGridCell}">
            <Setter Property="Background" Value="{x:Null}" />
            <Setter Property="BorderBrush" Value="{x:Null}" />
            <Style.Triggers>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="Background" Value="{x:Null}" />
                    <Setter Property="BorderBrush" Value="{x:Null}" />
                </Trigger>
            </Style.Triggers>
        </Style>

    </Window.Resources>
    <Grid>
        <DataGrid x:Name="CandidatesEpisodesMatrix" 
                  ColumnWidth="*"
                  AutoGenerateColumns="False" CanUserAddRows="False" HeadersVisibility="Column" SnapsToDevicePixels="True" SelectionUnit="Cell" RowDetailsVisibilityMode="Collapsed" >
            <DataGrid.Columns>
                <DataGridTextColumn Binding="{Binding Name}" />
                <DataGridCheckBoxColumn/>
                <!-- Other columns are added dynamically -->
            </DataGrid.Columns>
            <System:Object/>
            <System:Object/>
        </DataGrid>
    </Grid>
</Window>

这是我背后的代码：

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

        AddMatrixColumn();
    }

    private void AddMatrixColumn()
    {
        var factory = new FrameworkElementFactory(typeof(CheckBox));
        var columnCellTemplate = new DataTemplate(typeof(CheckBox));
        columnCellTemplate.VisualTree = factory;
        var style = new Style();
        style.Setters.Add(new Setter(HorizontalAlignmentProperty, HorizontalAlignment.Stretch));
        style.Triggers.Add(new DataTrigger
        {
            Binding = new Binding("IsSelected"),
            Value = true,
            Setters =
            {
                new Setter(BackgroundProperty, Brushes.BlueViolet),
                new Setter(BorderBrushProperty, Brushes.Aqua),
            }
        });
        var headerStyle = new Style();
        headerStyle.Setters.Add(new Setter(HorizontalAlignmentProperty, HorizontalAlignment.Center));
        var column = new DataGridTemplateColumn();
        column.Header = "episode.Name";
        column.HeaderStyle = headerStyle;
        column.CellTemplate = columnCellTemplate;
        column.CellStyle = style;

        CandidatesEpisodesMatrix.Columns.Add(column);
    }
}

我曾希望通过在样式中添加触发器来更改背景颜色，但没有成功。我做错了什么？

Answer 1

找到了！我几乎和扳机在一起了。不是 DataTrigger，而是正常的 Trigger。触发器应该是这样的：

        style.Triggers.Add(new Trigger
        {
            Property = DataGridCell.IsSelectedProperty,
            Value = true,
            Setters =
            {
                new Setter(BackgroundProperty, Brushes.Transparent),  // Or whatever color
                new Setter(BorderBrushProperty, Brushes.Transparent),
            }
        });

以编程方式将 Column 添加到 Datagrid，在选择时保持蓝色背景样式

Programmatically added Column to Datagrid keeps blue background style when selected

c#

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