继承DataGridTextColumn并重写GenerateElement

Question

我正在尝试创建一个自定义DataGrid,我可以根据单元格值格式化单个单元格(即;负值为红色文字,后置为绿色)ala这种方法...

如何在WPFToolkit DataGrid中获取当前单元格的绑定值

我还需要将值从负值转换为括号(即:-2.34到(2.34)).我有继承/过度工作.我的问题是,如何访问重写的GenerateElement方法中的单元格中的值.

菲利,提前谢谢

Answer 1

我的做法是错误的。我需要使用 IValueConverter 并绑定 Text 和 Foreground 属性，如下所示......

type FixedDecimalConverter() =
    interface  IValueConverter with
        member this.Convert(value, targetType, parameter, culture) = 
            match value :?> Double with 
                | Globals.DataGridHelper.IsNegative x -> 
                    sprintf "(%.2f%%)" (Math.Abs x) :> obj                        
                | Globals.DataGridHelper.IsPositive x -> 
                    sprintf "%.2f%%" x :> obj

        member this.ConvertBack(value, targetType, parameter, culture) = raise <| NotImplementedException()

type ForegroundValueConverter() =
    interface  IValueConverter with
        member this.Convert(value, targetType, parameter, culture) = 
            match value :?> Double with 
                | Globals.DataGridHelper.IsNegative x -> Globals.DataGridHelper.redBrush :> obj
                | Globals.DataGridHelper.IsPositive x -> Globals.DataGridHelper.greenBrush :> obj

        member this.ConvertBack(value, targetType, parameter, culture) = raise <| NotImplementedException()

还有 Xaml...

<data:DataGridTemplateColumn Header="YTD v. Sector" x:Name="YTDvSector" Visibility="Collapsed">
                            <data:DataGridTemplateColumn.CellTemplate>
                                <DataTemplate>
                                    <TextBlock  TextAlignment="Right" VerticalAlignment="Center"
                                            Text="{Binding ytdSectorReturn.value, Converter={StaticResource fcFixedDecimalConverter}}"
                                            Foreground="{Binding ytdSectorReturn.value, Converter={StaticResource fcForegroundValueConverter}}"/>
                                </DataTemplate>
                            </data:DataGridTemplateColumn.CellTemplate>
                        </data:DataGridTemplateColumn>

还有水管...

<UserControl.Resources>
        <y:FixedDecimalConverter x:Key="fcFixedDecimalConverter" />
        <y:ForegroundValueConverter x:Key="fcForegroundValueConverter" />
    </UserControl.Resources>