Question

在WPF中，我需要根据与此数据网格中其他行的比较为dataGridRow添加边框。

我无法更改源项属性，因此我想使用转换器来设置与条件匹配的行样式。

如何将当前用作DataGrid ItemsSource的ObservableCollection作为converterParameter传递给转换器？

<DataGrid ItemsSource="{Binding TableItems}" Name="TableDataGrid" AutoGenerateColumns="False" BorderThickness="0">
    <DataGrid.ItemContainerStyle>
        <Style TargetType="DataGridRow">
            <Setter Property="BorderBrush" Value="#FF9E9E9E"/>
            <Setter Property="BorderThickness" Value="{Binding Path=., Converter={StaticResource converter}, ConverterParameter= ??? }"/>
        </Style>
    </DataGrid.ItemContainerStyle>
    <DataGrid.Columns>
    ...
    </DataGrid.Columns>
</DataGrid>

从上面的示例代码中，我想将TableItems作为ConverterParameter传递。

Answer 1

由于您无法绑定绑定的ConverterParameter属性，因此应使用MultiBinding并使转换器实现IMultiValueConverter。

<Setter Property="BorderThickness">
    <Setter.Value>
        <MultiBinding Converter="{StaticResource converter}">
            <Binding Path="."/>
            <Binding Path="DataContext.TableItems"
                     RelativeSource="{RelativeSource AncestorType=DataGrid}"/>
        </MultiBinding>
    </Setter.Value>
</Setter>

Answer 2

您无法将任何内容绑定到ConverterParameter属性，因为它不是依赖项属性。

您可以使用带有多个输入值的IMultiValueConverter：

<DataGrid.ItemContainerStyle>
    <Style TargetType="DataGridRow">
        <Setter Property="BorderBrush" Value="#FF9E9E9E"/>
        <Setter Property="BorderThickness">
            <Setter.Value>
                <MultiBinding Converter="{StaticResource multiConverter}">
                    <Binding Path="." />
                    <Binding Path="DataContext.TableItems" RelativeSource="{RelativeSource AncestorType=DataGrid}" />
                </MultiBinding>
            </Setter.Value>
        </Setter>
    </Style>
</DataGrid.ItemContainerStyle>

或者您可以向转换器添加depenendency属性并将此属性绑定到DataGrid的ItemsSource集合：

public class DataGridConverter : DependencyObject, IValueConverter
{
    public static readonly DependencyProperty SourceCollectionProperty =
         DependencyProperty.Register("SourceCollection", typeof(IEnumerable),
         typeof(DataGridConverter), new FrameworkPropertyMetadata(null));

    public IEnumerable SourceCollection
    {
        get { return (IEnumerable)GetValue(SourceCollectionProperty); }
        set { SetValue(SourceCollectionProperty, value); }
    }


    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return value;
    }

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

<DataGrid ItemsSource="{Binding TableItems}" Name="TableDataGrid" AutoGenerateColumns="False" BorderThickness="0">
    <DataGrid.Resources>
        <local:DataGridConverter x:Key="converter" SourceCollection="{Binding Path=DataContext.TableItems, Source={x:Reference TableDataGrid}}" />
    </DataGrid.Resources>
    <DataGrid.ItemContainerStyle>
        <Style TargetType="DataGridRow">
            <Setter Property="BorderBrush" Value="#FF9E9E9E"/>
            <Setter Property="BorderThickness" Value="{Binding Path=., Converter={StaticResource converter}}"/>
        </Style>
    </DataGrid.ItemContainerStyle>
</DataGrid>

将DataGrid ItemsSource作为converterParameter发送

2 个答案: