Question

我想实现WPF DataGrid分组。我看到的大多数示例都涉及Observablecollection，并且可以正常工作。但是，我的问题是我正在使用数据集，而我的CollectionViewSource被窃听到了数据集。

我按照下面所附的示例进行了尝试，它似乎可以工作。但是，对于行汇总，转换器仅选择第一个条目，而从第二个条目开始不进行汇总。我想念什么？我再次不使用Observablecollection，而是使用老式的DataSet。

这是XAML

<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WpfApplication1" x:Class="MainWindow"
    Title="MainWindow" Height="350" Width="325">
    <Window.Resources>
        <local:SuTotals x:Key="SuTotals"/>
        <local:DataSet1 x:Key="DataSet1"/>
        <CollectionViewSource x:Key="SalesViewSource" Source="{Binding Sales, Source={StaticResource DataSet1}}">
            <CollectionViewSource.GroupDescriptions>
                <PropertyGroupDescription PropertyName="Description" />
            </CollectionViewSource.GroupDescriptions>
        </CollectionViewSource>
    </Window.Resources>
    <Grid>
        <DataGrid  x:Name="SalesDataGrid" AutoGenerateColumns="False" EnableRowVirtualization="True" ItemsSource="{Binding Source={StaticResource SalesViewSource}}"  RowDetailsVisibilityMode="VisibleWhenSelected" >
            <DataGrid.Columns>
                <DataGridTextColumn x:Name="Column1" IsReadOnly="True" Binding="{Binding Description}" Header="Description" Width="*"/>
                <DataGridTextColumn x:Name="Column2" Binding="{Binding Amount, NotifyOnSourceUpdated=True, UpdateSourceTrigger=PropertyChanged}" Header="Amount" Width="100"/>
            </DataGrid.Columns>
            <DataGrid.GroupStyle>
                <GroupStyle>
                    <GroupStyle.ContainerStyle>
                        <Style TargetType="{x:Type GroupItem}">
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="{x:Type GroupItem}">
                                        <Expander IsExpanded="true" BorderBrush="#FFA4B97F" BorderThickness="0,0,0,1">
                                            <Expander.Header>
                                                <Grid>
                                                    <Grid.ColumnDefinitions>
                                                        <ColumnDefinition Width="{Binding ElementName=Column1, Path=ActualWidth}"/>
                                                        <ColumnDefinition Width="{Binding ElementName=Column2, Path=ActualWidth}"/>
                                                    </Grid.ColumnDefinitions>
                                                    <StackPanel Orientation="Horizontal">
                                                        <TextBlock Grid.Column="0" Text="Total: " FontWeight="Bold" Margin="0,0,15,0" TextAlignment="Right"/>
                                                        <TextBlock Grid.Column="1" Text="{Binding Path=ItemCount}"  Margin="0,0,15,0" TextAlignment="Right"/>
                                                    </StackPanel>
                                                    <TextBlock Grid.Column="1" Text="{Binding Path=Items, Converter={StaticResource SuTotals}, NotifyOnTargetUpdated=True, UpdateSourceTrigger=PropertyChanged}"  Margin="0,0,15,0" TextAlignment="Center"/>
                                                </Grid>
                                            </Expander.Header>
                                            <ItemsPresenter />
                                        </Expander>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </GroupStyle.ContainerStyle>
                </GroupStyle>
            </DataGrid.GroupStyle>
        </DataGrid>
    </Grid>
</Window>

这是背后的代码：

VB.NET

Public Class SuTotals
    Implements IValueConverter


    Public Function Convert(value As Object, targetType As Type, parameter As Object, culture As Globalization.CultureInfo) As Object Implements IValueConverter.Convert

        Dim rows As IEnumerable(Of Object) = CType(value, IEnumerable(Of Object))
        Dim c As Integer = 0

        For Each item As Object In rows
            c += item("Amount")
        Next

        Return c

    End Function

    Public Function ConvertBack(value As Object, targetType As Type, parameter As Object, culture As Globalization.CultureInfo) As Object Implements IValueConverter.ConvertBack
        Throw New NotImplementedException
    End Function
End Class

C＃

public class SuTotals : IValueConverter
{
    public object IValueConverter.Convert(object value, Type targetType, object parameter, Globalization.CultureInfo culture)
    {
        IEnumerable<object> rows = (IEnumerable<object>)value;
        int c = 0;
        foreach (object item in rows) {
            c += item("Amount");
        }
        return c;
    }

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

该数据集被命名为 DataSet1 ，该表被命名为销售。它有2列，分别为描述作为字符串和 Amount 作为Double。

使用DataSet的WPF Datagrid分组和行总计

0 个答案: