Question

有很多Datagrid分组教程和问题，但我似乎无法让我的转换器计算我的项目总数。

情况是我有一个数据网格，显示有时间列的项目，即完成任务的小时数，项目按任务完成日期分组 - 见下文

因此要显示的总数是1/8/16组标题中的7.5

我相信我需要使用Linq使用group属性作为过滤器来查询ObservableCollection，但我很难知道该做什么以及如何做。传递给转换器的集合中的项目似乎只有Group Items而不是下面的项目，就像属于该组的项目不在传递的集合中一样。

任何指针都表示赞赏，如果我错过任何需要的代码，我会清楚地添加它我不太了解这一点 - 提前谢谢

这是我的转换器代码

 public class GroupTotalsToStringConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value is ReadOnlyObservableCollection<Object>)
        {
            var items = (ReadOnlyObservableCollection<Object>)value;
            Decimal total = 0;
            foreach (GroupItem gi in items)
            {
                //sometype of query to add up timespent

            }
            return total.ToString();
        }
        return "";
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return value;
    }

}

我的Datagrid xmal是

<DataGrid AutoGenerateColumns="False" EnableRowVirtualization="True" Height="271" ItemsSource="{Binding}" 
                          Name="enteredticketsDataGrid" RowDetailsVisibilityMode="VisibleWhenSelected" Width="435" 
                           Background="Black" RowBackground="Black" 
                      AlternatingRowBackground="DarkBlue"
                          MouseDoubleClick="enteredticketsDataGrid_MouseDoubleClick" Cursor="Arrow" 
                          IsReadOnly="True" ToolTip="Select the Date From and To and Refresh the grid. Dounle click on a return ticket to open the Edit screen for that ticket.">
                    <DataGrid.Columns>
                        <DataGridTextColumn x:Name="ticketDateColumn" Binding="{Binding Path=TicketDate, StringFormat=\{0:dd/MM/yy\} }" Header="Date" Width="Auto" />
                        <DataGridTextColumn x:Name="statusColumn" Binding="{Binding Path=status}" Header="status" Width="SizeToHeader" />
                        <DataGridTextColumn x:Name="numberColumn" Binding="{Binding Path=number}" Header="number" Width="Auto" />
                        <DataGridTextColumn x:Name="timespentColumn1" Binding="{Binding Path=timespent}" Header="Time" Width="SizeToHeader" />
                        <DataGridTextColumn x:Name="subjectColumn" Binding="{Binding Path=subject}" Header="Subject" Width="Auto" />


                    </DataGrid.Columns>
                    <DataGrid.GroupStyle>
                        <!-- Style for groups at top level. -->
                        <GroupStyle>
                            <GroupStyle.ContainerStyle>
                                <Style TargetType="{x:Type GroupItem}">
                                    <Setter Property="Margin" Value="0,0,0,5"/>
                                    <Setter Property="Template">
                                        <Setter.Value>
                                            <ControlTemplate TargetType="{x:Type GroupItem}">
                                                <Expander IsExpanded="False" Background="#FF112255" BorderBrush="#FF002255" Foreground="#FFEEEEEE" BorderThickness="1,1,1,5">
                                                    <Expander.Header>
                                                        <DockPanel>
                                                            <TextBlock FontWeight="Bold" Text="{Binding Path=Name, Converter={StaticResource StringToDateTimeConverter }}" Margin="5,0,0,0" Width="100"/>
                                                            <TextBlock FontWeight="Bold" Text="{Binding Path=ItemCount}"/>
                                                            <!--<TextBlock FontWeight="Bold" Text="Test"/>-->
                                                            <TextBlock Text="{Binding  Path=Text, Converter={StaticResource GroupTotalsToStringConverter}}"></TextBlock>

                                                        </DockPanel>
                                                    </Expander.Header>
                                                    <Expander.Content>
                                                        <ItemsPresenter />
                                                    </Expander.Content>
                                                </Expander>
                                            </ControlTemplate>
                                        </Setter.Value>
                                    </Setter>
                                </Style>
                            </GroupStyle.ContainerStyle>
                        </GroupStyle>
                    </DataGrid.GroupStyle>
                </DataGrid>

Answer 1

试试这个：

XAML

<Expander.Header>
     <DockPanel>
          <TextBlock FontWeight="Bold" Text="{Binding Path=Name, Converter={StaticResource StringToDateTimeConverter }}" Margin="5,0,0,0" Width="100"/>
          <TextBlock FontWeight="Bold" Text="{Binding Path=ItemCount}"/>

          <TextBlock Text="{Binding  Path=Items, Converter={StaticResource GroupTotalsToStringConverter}, UpdateSourceTrigger=PropertyChanged}" />

     </DockPanel>
</Expander.Header>

这会将您的ItemsCollection作为值提供给Converter。特定的数据类型属于您的ItemsSource，可以通过ConverterCall上的调试找到。

计算列的Datagrid组总计并在Group Header中显示它们

1 个答案: