c# - 代码隐藏中的 WPF DataGrid 样式

Question

我的 WPF 应用程序中有一个用于数据网格的 xaml 样式，我现在正在编写一个继承自 DataGrid 的自定义控件，我想在代码隐藏中应用以下样式:

<Style TargetType="DataGrid">

    <!-- Make the border and grid lines a little less imposing -->
    <Setter Property="BorderBrush" Value="#DDDDDD" />
    <Setter Property="HorizontalGridLinesBrush" Value="#DDDDDD" />
    <Setter Property="VerticalGridLinesBrush" Value="#DDDDDD" />

    <Setter Property="RowStyle">
        <Setter.Value>
            <Style TargetType="DataGridRow">
                <Style.Triggers>
                    <!-- Highlight a grid row as the mouse passes over -->
                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter Property="Background" Value="Lavender" />
                    </Trigger>
                </Style.Triggers>
            </Style>
        </Setter.Value>
    </Setter>
    <Setter Property="CellStyle">
        <Setter.Value>
            <Style TargetType="DataGridCell">
                <Style.Triggers>
                    <!-- Highlight selected rows -->
                    <Trigger Property="IsSelected" Value="True">
                        <Setter Property="Background" Value="Lavender" />
                        <Setter Property="BorderBrush" Value="Lavender" />
                        <Setter Property="Foreground" Value="Black" />
                    </Trigger>
                    <!--StartsEditingOnMouseOver-->
                    <!--<Trigger Property="IsMouseOver" Value="True">
                        <Setter Property="IsEditing" Value="True" />
                    </Trigger>-->
                </Style.Triggers>

                <EventSetter Event="PreviewMouseLeftButtonDown" Handler="DataGridCell_PreviewMouseLeftButtonDown" />
                <EventSetter Event="PreviewTextInput" Handler="DataGridCell_PreviewTextInput" />

                <!-- Add some padding around the contents of a cell -->
                <Setter Property="Padding" Value="4,3,4,3" />
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="DataGridCell">
                            <Border Padding="{TemplateBinding Padding}" 
                            Background="{TemplateBinding Background}">
                                <ContentPresenter />
                            </Border>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </Setter.Value>
    </Setter>
</Style>

到目前为止，我有以下代码:

static DionysusDataGrid()
{

  BorderBrushProperty.OverrideMetadata(typeof(DionysusDataGrid), new FrameworkPropertyMetadata(ColorConverter.ConvertFromString("#FFDDDDDD") as Color?));
  HorizontalGridLinesBrushProperty.OverrideMetadata(typeof(DionysusDataGrid), new FrameworkPropertyMetadata(ColorConverter.ConvertFromString("#FFDDDDDD") as Color?));
  VerticalGridLinesBrushProperty.OverrideMetadata(typeof(DionysusDataGrid), new FrameworkPropertyMetadata(ColorConverter.ConvertFromString("#FFDDDDDD") as Color?));

}

但我不知道如何对本身也有样式的“RowStyle”属性做同样的事情。在设置 BorderBrushProperty 时我也收到以下错误:

Default value type does not match type of property 'BorderBrush'."

谁能帮帮我？

谢谢

更新:

我通过将代码更新为以下内容解决了错误:

    static DionysusDataGrid()
{

  BrushConverter converter = new BrushConverter();

  BorderBrushProperty.OverrideMetadata(typeof(DionysusDataGrid), new FrameworkPropertyMetadata((System.Windows.Media.Brush)converter.ConvertFromString("#FFDDDDDD")));
  HorizontalGridLinesBrushProperty.OverrideMetadata(typeof(DionysusDataGrid), new FrameworkPropertyMetadata((System.Windows.Media.Brush)converter.ConvertFromString("#FFDDDDDD")));
  VerticalGridLinesBrushProperty.OverrideMetadata(typeof(DionysusDataGrid), new FrameworkPropertyMetadata((System.Windows.Media.Brush)converter.ConvertFromString("#FFDDDDDD")));

}

Answer 1

要在代码中隐藏样式，适用一些通用规则:

您在 XAML 中键入的任何内容在良好的旧 C# 中都有等效项:

<Style ...>只是System.Windows.Style . Setter也是如此, Trigger ，随你便。

唯一的陷阱来自 ContentProperty attribute 这是分配的默认属性，例如当您这样做时:

<TextBlock>My text here!</TextBlock>

它设置了 TextBlock.Text属性(property)"My text here!" ，因为 TextBlock类标有属性 [ContentProperty("Text")]

最后，当您从 C# 构建时，您需要从最嵌套的元素开始:

<Style TargetType="DataGrid">
    <Setter Property="BorderBrush" Value="#DDDDDD" />
</Style>

变成:

var brushConverter = new BrushConverter();

var bbSetter = new Setter(
    DataGrid.BorderBrushProperty, 
    brushConverter.ConvertFromString("#FFDDDDDD"));

var style = new Style(typeof(DataGrid));    
style.Setters.Add(bbSetter);

由此您应该能够将任何 XAML 转换为 C#，
不过，值得注意的是，您不能将任何 C# 映射到 XAML，例如，您不能在 XAML 中制作动态 Storyboard，但可以在 C# 中制作。