Question

我想根据数据表中绑定到DataGrid的行来为我的DataGrid ColumnHeader着色。但是我怎么能这样做呢？我在Datagrid.Row上使用的方法不起作用，因为显然没有“Column”属性可以使用。

我想出了这个，所以我可以在Colorconverter中使用整个DataGrid，但我无法找到确定当前呈现哪个Columnheader的方法。

XAML：

   <DataGrid x:Name="excelDataTable_ExcelData">
        <Style TargetType="DataGridColumnHeader">
            <Setter Property="Background" Value="{Binding RelativeSource={RelativeSource AncestorType=DataGrid}, Converter={StaticResource ExcelColumnColorConverter}}"></Setter>
        </Style>
    </DataGrid>

Colorconverter背后的代码：

public object Convert(object value, Type targetType, object parameter,   System.Globalization.CultureInfo culture)
{
    var col = (System.Data.DataColumn)value;
    var colStateObj = col.Table.Rows[col.Table.Rows.Count-1][col.ColumnName];
    Enums.RowState colorValue = (Enums.RowState)Enum.Parse(typeof(Enums.RowState), colStateObj.ToString());

    switch (colorValue)
    {
        case Enums.RowState.HeaderRow:
            return Brushes.Gainsboro;
        case Enums.RowState.isIncluded:
            return Brushes.LightGreen;
        case Enums.RowState.NotIncluded:
            return Brushes.LightSalmon;
        default:
            return Brushes.Azure;
    }
}

/// <summary>
/// Converts the value of the hidden Color row to a color on the Data table.
/// </summary>
/// <param name="value">The value</param>
/// <param name="targetType">The type of the binding target.</param>
/// <param name="parameter">The converter parameter.</param>
/// <param name="culture">The culture</param>
/// <returns>
/// EThe converted value or NULL
/// </returns>
/// <exception cref="System.NotImplementedException">Not implemented because it is not needed</exception>
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
    throw new NotImplementedException();
}

Answer 1

我最终使用Multibinding来解决问题：

XAML：

  <Style TargetType="DataGridColumnHeader">
                    <Setter Property="Background">
                        <Setter.Value>
                            <MultiBinding Converter="{StaticResource ExcelColumnColorConverter}">
                                <Binding RelativeSource="{RelativeSource AncestorType=DataGrid}"></Binding>
                                <Binding RelativeSource="{RelativeSource self}" Path="Column"></Binding>
                            </MultiBinding>
                        </Setter.Value>
                    </Setter>
                </Style>

转换器：

 public class ExcelColumnColorConverter : IMultiValueConverter
    {
   public object Convert(object[] value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (!(value[1] == null))
            {
                var dgrid = (DataGrid)value[0];
                var colHeader = ((DataGridTextColumn)value[1]).Header.ToString();

                var dView = (System.Data.DataView)dgrid.ItemsSource;
                var table = dView.Table;

                var rowstateObj = table.Rows[table.Rows.Count - 1][colHeader];
                Enums.RowState colorValue = (Enums.RowState)Enum.Parse(typeof(Enums.RowState), rowstateObj.ToString());

                switch (colorValue)
                {
                    case Enums.RowState.HeaderRow:
                        return Brushes.Gainsboro;
                    case Enums.RowState.isIncluded:
                        return Brushes.LightGreen;
                    case Enums.RowState.NotIncluded:
                        return Brushes.LightSalmon;
                    default:
                        return Brushes.Azure;
                }
            }
            else
            {
                return null;
            }

        }

将Datagrid Columnheader背景绑定到da数据表行

1 个答案: