C# WPF：如何将重复DataGrid列样式转为资源并单次绑定对象？

核心思路：通过BindingProxy传递列索引，让通用样式动态绑定对应Aps对象 #

WPF的DataGridCell上下文是行数据，无法直接获取列索引，因此需要借助**绑定代理（BindingProxy）**传递列的索引信息，让通用样式能根据索引动态绑定Aps集合里的对应项。

步骤1：实现BindingProxy类 #

这个类用于在资源中传递绑定值（此处为列索引）：

public class BindingProxy : Freezable
{
    protected override Freezable CreateInstanceCore()
    {
        return new BindingProxy();
    }

    public object Data
    {
        get => GetValue(DataProperty);
        set => SetValue(DataProperty, value);
    }

    public static readonly DependencyProperty DataProperty =
        DependencyProperty.Register("Data", typeof(object), typeof(BindingProxy), new UIPropertyMetadata(null));
}

步骤2：定义通用样式资源 #

在Resources中统一编写单元格样式和文本块样式，通过BindingProxy动态获取列索引：

<Window.Resources>
    <!-- 通用单元格样式 -->
    <Style x:Key="GenericDataGridCellStyle" TargetType="DataGridCell" BasedOn="{StaticResource dgc}">
        <Setter Property="ToolTip" Value="{Binding Aps[{Binding Data, Source={StaticResource ColumnIndexProxy}}].ToolTipText}" />
        <Setter Property="ContextMenu" Value="{StaticResource contextMenu}" />
        <Setter Property="Background" Value="{Binding Aps[{Binding Data, Source={StaticResource ColumnIndexProxy}}].CellBackground}" />
        <Setter Property="Foreground" Value="{Binding Aps[{Binding Data, Source={StaticResource ColumnIndexProxy}}].CellForeground}" />
        <Setter Property="BorderBrush" Value="{Binding Aps[{Binding Data, Source={StaticResource ColumnIndexProxy}}].CellBorderBrush}" />
        <Setter Property="BorderThickness" Value="{Binding Aps[{Binding Data, Source={StaticResource ColumnIndexProxy}}].CellBorderThickness}" />

        <Style.Triggers>
            <Trigger Property="IsSelected" Value="True">
                <Setter Property="Background" Value="{Binding Aps[{Binding Data, Source={StaticResource ColumnIndexProxy}}].CellBackground}" />
                <Setter Property="Foreground" Value="{Binding Aps[{Binding Data, Source={StaticResource ColumnIndexProxy}}].CellForeground}" />
            </Trigger>
        </Style.Triggers>
    </Style>

    <!-- 通用文本块样式 -->
    <Style x:Key="GenericTextBlockStyle" TargetType="TextBlock" BasedOn="{StaticResource tb}" />
</Window.Resources>

步骤3：简化DataGrid列定义 #

每个列只需指定索引、Header和绑定，直接引用通用样式即可：

<materialDesign:DataGridTextColumn x:Name="Jan" Header="Jan" Binding="{Binding Aps[0].CellValue}">
    <materialDesign:DataGridTextColumn.Resources>
        <!-- 当前列专属的索引代理 -->
        <local:BindingProxy x:Key="ColumnIndexProxy" Data="0"/>
    </materialDesign:DataGridTextColumn.Resources>
    <DataGridTextColumn.CellStyle>
        <StaticResource ResourceKey="GenericDataGridCellStyle"/>
    </DataGridTextColumn.CellStyle>
    <DataGridTextColumn.ElementStyle>
        <StaticResource ResourceKey="GenericTextBlockStyle"/>
    </DataGridTextColumn.ElementStyle>
</materialDesign:DataGridTextColumn>

<materialDesign:DataGridTextColumn x:Name="Feb" Header="Feb" Binding="{Binding Aps[1].CellValue}">
    <materialDesign:DataGridTextColumn.Resources>
        <local:BindingProxy x:Key="ColumnIndexProxy" Data="1"/>
    </materialDesign:DataGridTextColumn.Resources>
    <DataGridTextColumn.CellStyle>
        <StaticResource ResourceKey="GenericDataGridCellStyle"/>
    </DataGridTextColumn.CellStyle>
    <DataGridTextColumn.ElementStyle>
        <StaticResource ResourceKey="GenericTextBlockStyle"/>
    </DataGridTextColumn.ElementStyle>
</materialDesign:DataGridTextColumn>

<!-- 剩余10列依此类推，仅修改索引、Name和Header -->

可选优化：改用DataGridTemplateColumn #

如果允许替换列类型，可以把单元格内容也封装到通用模板中，进一步简化代码：

<Window.Resources>
    <!-- 通用单元格内容模板 -->
    <DataTemplate x:Key="GenericCellTemplate">
        <TextBlock Text="{Binding Aps[{Binding Data, Source={StaticResource ColumnIndexProxy}}].CellValue}" 
                   Style="{StaticResource tb}"/>
    </DataTemplate>
</Window.Resources>

<!-- 列定义示例 -->
<materialDesign:DataGridTemplateColumn x:Name="Jan" Header="Jan">
    <materialDesign:DataGridTemplateColumn.Resources>
        <local:BindingProxy x:Key="ColumnIndexProxy" Data="0"/>
    </materialDesign:DataGridTemplateColumn.Resources>
    <DataGridTemplateColumn.CellStyle>
        <StaticResource ResourceKey="GenericDataGridCellStyle"/>
    </DataGridTemplateColumn.CellStyle>
    <DataGridTemplateColumn.CellTemplate>
        <StaticResource ResourceKey="GenericCellTemplate"/>
    </DataGridTemplateColumn.CellTemplate>
</materialDesign:DataGridTemplateColumn>

关键说明 #

• 绑定代理的作用是突破WPF绑定上下文限制，让单元格样式能获取到列的索引值；
• 每个列的Resources中定义独立的ColumnIndexProxy，确保样式绑定对应索引的Aps对象；
• 所有重复的样式逻辑集中到通用资源中，后续修改只需维护一处即可。

内容的提问来源于stack exchange，提问作者Kariko