WPF Datagrid绑定自定义列标题

Question

我试图弄清楚如何使用MVVM模式将WPF DataGrid的列标题和主数据绑定到数据源.我正在寻找的结果将是这样的:

alt text http://brian.vallelunga.com/files/datagrid-custom-headers.PNG

我已成功设置了标题,但我不确定如何绑定标题中的值.具体来说,复选框的IsChecked属性,组合框的选定索引和文本框的值.

我以前使用一个简单的DataTable来填充主网格数据,但是我需要更复杂的东西来保存网格数据和每列的值.或许我可以完全将它们存储为单独的实体.

那么,有没有人知道如何实现这种约束？一个限制是列必须是自动生成的,因为我不知道它们在运行时会是什么.应用程序只是从Excel电子表格加载数据,并且可能存在任意数量的列.

谢谢,Brian

Answer 1

以下是我最终使用MVVM模式进行的操作:

我有两组用于绑定视图模型的数据:一组用于实际网格数据,另一组用于列标题.目前这些属于两个属性:

// INotifyPropertyChanged support not shown for brevity
public DataTable GridData { get; set; } 
public BindingList<ImportColumnInfo> ColumnData { get; set; }

使用两组不同数据的技巧是在网格中.我已经将DataGrid子类化,并为网格提供了一个名为ColumnSource的附加数据源,作为依赖项属性.这是我的视图模型上的ColumnData绑定的内容.然后,我将每个自动生成的列的标题设置为ColumnSource数据源中的适当索引数据.代码如下:

public class ImporterDataGrid : DataGrid
{
    protected override void OnAutoGeneratingColumn(DataGridAutoGeneratingColumnEventArgs e)
    {
        base.OnAutoGeneratingColumn(e);

        int columnIndex = this.Columns.Count;
        var column = new ImporterDataGridColumn();
        column.Header = ColumnSource[columnIndex];
        column.Binding = new Binding(e.PropertyName) { Mode = BindingMode.OneWay };
        e.Column = column;
    }

    public IList ColumnSource
    {
        get { return (IList)GetValue(ColumnSourceProperty); }
        set { SetValue(ColumnSourceProperty, value); }
    }

    public static readonly DependencyProperty ColumnSourceProperty = DependencyProperty.Register("ColumnSource", typeof(IList), typeof(ImporterDataGrid), new FrameworkPropertyMetadata(null));

}

我现在可以在我的列的模板化标头中执行常规数据绑定,这将全部绑定到我的视图模型的ColumnData属性中的数据.

更新:我被要求显示我的网格的XAML.这是非常基本的,但它是:

<Controls:ImporterDataGrid 
    AutoGenerateColumns="True" x:Name="previewDataGrid"
    VerticalScrollBarVisibility="Visible"
    HorizontalScrollBarVisibility="Visible"
    IsReadOnly="True"
    SelectionMode="Extended"
    HeadersVisibility="Column"
    ItemsSource="{Binding PreviewData}"
    ColumnSource="{Binding PreviewColumnData}"
    Style="{StaticResource ImporterDataGridStyle}"
    Background="White" CanUserReorderColumns="False" CanUserResizeRows="False"
    CanUserSortColumns="False" AlternatingRowBackground="#FFFAFAFA" AllowDrop="True" />

这是ImporterColumnHeaderStyle:

<Style x:Key="ImporterDataGridColumnHeaderStyle" TargetType="{x:Type toolkit:DataGridColumnHeader}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type toolkit:DataGridColumnHeader}">
                <Grid>
                    <toolkit:DataGridHeaderBorder Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}" IsClickable="{TemplateBinding CanUserSort}" IsHovered="False" IsPressed="False" SortDirection="{TemplateBinding SortDirection}">
                        <Grid>
                            <CheckBox Height="16" Margin="6,6,16,0" Name="importCheckBox" IsChecked="{Binding Path=Import}" VerticalAlignment="Top">Import Column</CheckBox>
                            <StackPanel IsEnabled="{Binding Path=Import}">
                                <ComboBox Height="24" Margin="6,29,6,0" Name="columnTypeComboBox" VerticalAlignment="Top" SelectedValue="{Binding ColumnType}" ItemsSource="{Binding Source={local:EnumList {x:Type Models:ImportColumnType}}}">
                                </ComboBox>
                                <TextBox Height="23"  Margin="6,6,6,33" Name="customHeadingTextBox" VerticalAlignment="Bottom" Text="{Binding Path=CustomColumnName}" IsEnabled="{Binding ColumnType, Converter={StaticResource ColumnTypeToBooleanConverter}}" />
                            </StackPanel>
                            <TextBlock Height="20" Margin="6,0,6,7" Name="originalHeadingTextBlock" Text="{Binding Path=OriginalColumnName}" VerticalAlignment="Bottom" Foreground="Gray" />
                        </Grid>
                    </toolkit:DataGridHeaderBorder>

                    <Thumb x:Name="PART_LeftHeaderGripper" HorizontalAlignment="Left">
                        <Thumb.Style>
                            <Style TargetType="{x:Type Thumb}">
                                <Setter Property="Width" Value="8"/>
                                <Setter Property="Background" Value="Transparent"/>
                                <Setter Property="Cursor" Value="SizeWE"/>
                                <Setter Property="Template">
                                    <Setter.Value>
                                        <ControlTemplate TargetType="{x:Type Thumb}">
                                            <Border Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}"/>
                                        </ControlTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </Thumb.Style>
                    </Thumb>
                    <Thumb x:Name="PART_RightHeaderGripper" HorizontalAlignment="Right">
                        <Thumb.Style>
                            <Style TargetType="{x:Type Thumb}">
                                <Setter Property="Width" Value="8"/>
                                <Setter Property="Background" Value="Transparent"/>
                                <Setter Property="Cursor" Value="SizeWE"/>
                                <Setter Property="Template">
                                    <Setter.Value>
                                        <ControlTemplate TargetType="{x:Type Thumb}">
                                            <Border Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}"/>
                                        </ControlTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </Thumb.Style>
                    </Thumb>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>