使用converterParameter的Datagrid单元格样式

时间:2016-09-20 15:41:02

标签: c# wpf datagrid

如何在datagrid单元格的样式设置器中使用converterParameter? 我需要知道转换器中的元素名称或属性名称。

XAML:

<Window.Resources>
    <view:IsEnabledCellConverter x:Key="IsEnabledCellConverter"/>
    <Style x:Key="CellStyle" TargetType="{x:Type DataGridCell}">
        <Setter Property="IsEnabled" 
                Value="{Binding 
                        Path=Item,
                        Converter={StaticResource ResourceKey=IsEnabledCellConverter}, 
                        ConverterParameter={?????}}"
                        RelativeSource={RelativeSource AncestorType={x:Type DataGridRow}} />
    </Style>
.../...

<Datagrid>
     <DataGrid.Columns>
         <DataGridTextColumn x:Name="Design" 
                             CellStyle="{StaticResource CellStyle}" 
                             Value="{Binding Path=Design}"/>
         <DataGridTextColumn x:Name="FooBar" 
                             CellStyle="{StaticResource CellStyle}" 
                             Value="{Binding Path=Foobar}"/>
     </DataGrid.Columns>
</Datagrid>

转换器类:

class IsEnabledCellConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        string p = (string)parameter;
        MyItem item = (MyItem)value;

        switch (p)
        {
            case "Design":
                return string.IsNullOrEmpty(item.Reference);
                break;
            case "FooBar":
                return item.Something != true;
                break;
            default:
                return true;
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

编辑:我添加了一些细节来了解需求。 所以我的所有列IsEnabled道具都绑定了这个全局转换器有两个原因:

  1. 它更容易维护
  2. 需要启用某些列,具体取决于其他项值的值。

1 个答案:

答案 0 :(得分:2)

您应该使用DisplayIndexHeader,并相应地设置ConverterParameter

<Style x:Key="CellStyle" TargetType="{x:Type DataGridCell}">
    <Style.Triggers>
        <DataTrigger Binding="{Binding Column.DisplayIndex, RelativeSource={RelativeSource Self}}" Value="0">
            <Setter Property="IsEnabled" 
                    Value="{Binding 
                            Path=Item,
                            Converter={StaticResource ResourceKey=IsEnabledCellConverter}, 
                            ConverterParameter=0,
                            RelativeSource={RelativeSource AncestorType={x:Type DataGridRow}}}" />
        </DataTrigger>
        <DataTrigger Binding="{Binding Column.DisplayIndex, RelativeSource={RelativeSource Self}}" Value="1">
            <Setter Property="IsEnabled" 
                    Value="{Binding 
                            Path=Item,
                            Converter={StaticResource ResourceKey=IsEnabledCellConverter}, 
                            ConverterParameter=1,
                            RelativeSource={RelativeSource AncestorType={x:Type DataGridRow}}}" />
        </DataTrigger>
    </Style.Triggers>
</Style>

请告诉我这是否解决了您的问题。