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......

How to get Binding value of current cell in a WPFToolkit DataGrid

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，如何在重写的GenerateElement方法中访问单元格中的值。

提前致谢，菲尔

Answer 1

我的做法错了。我需要使用IValueConverter并绑定Text和Foreground属性，如此...

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()

和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>

和管道......

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

继承DataGridTextColumn并重写GenerateElement

1 个答案: