Question

对于以下情况，我无法使数据绑定正常工作：

模型 - DetailEntries的集合，以及DailyDetailSet的一些集体属性：

[AddINotifyPropertyChangedInterface]
public class DailyDetailsSet
{
    public DailyDetailsSet(DateTime startDate, ObservableCollection<DailyDetailEntry> entries)
    {
        this.StartDate = startDate;
        this.Entries = entries;
    }

    public DateTime StartDate { get; }

    public decimal TotalHours => this.Entries.Sum(x => x.TotalHours);
    public string TotalHoursFormatted => this.TotalHours.ToFormattedDurationString();

    public ObservableCollection<DailyDetailEntry> Entries { get;  }

    public DetailsGroupingHeader DetailsGroupingHeader => new DetailsGroupingHeader(this.StartDate, this.TotalHours);

}

[AddINotifyPropertyChangedInterface]
public class DailyDetailEntry
{
    //some properties
}

public class DetailsGroupingHeader
{
    //Some text and color properties and overriden Equals() method to allow grouping
}

ViewModel - 从数据库中检索DailyDetailsSet的集合：

    [AddINotifyPropertyChangedInterface]
    public class EntryListViewModel : ViewModelBase
       {
         public ObservableCollection<DailyDetailsSet> EntrySets { get; set; }
       }
    }

一个视图应该包含一个列表框，它应该包含所有DailyDetailEntries，根据DetailsGroupingHeader（它真正比较输入日期）分组到每一天的组中。

查看：

<UserControl.Resources>
            <CollectionViewSource x:Key="Sets" Source="{Binding Path=EntrySets}">
                <CollectionViewSource.GroupDescriptions>
                <PropertyGroupDescription PropertyName="DetailsGroupingHeader" />
                </CollectionViewSource.GroupDescriptions>
            </CollectionViewSource>
    </UserControl.Resources>

        <ListView ItemsSource="{Binding}" DataContext="{StaticResource Sets}"  DockPanel.Dock="Bottom" Margin="5">

            <ListView.View >
                    <GridView >
                        <GridViewColumn DisplayMemberBinding="{Binding StartTimeFormatted}" Header="Start" Width="60"  />
                        <GridViewColumn DisplayMemberBinding="{Binding Comment}" Header="Comment"  >
                    </GridViewColumn>
                    </GridView>
                </ListView.View>
            <ListView.GroupStyle>
                <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" BorderBrush="#FFA4B97F" 
                                                  BorderThickness="0,0,0,1">
                                            <Expander.Header>
                                                <DockPanel>
                                                    <TextBlock Foreground="{Binding Path=Name.EntryColor}"  FontWeight="Bold" Text="{Binding Path=Name.TotalHoursFormatted}"/>
                                                    <TextBlock Foreground="{Binding Path=Name.EntryColor}"  FontWeight="Bold" Text=" hours - "/>
                                                    <TextBlock Foreground="{Binding Path=Name.EntryColor}" FontWeight="Bold" Text="{Binding Path=Name.EntryDateFormatted}"/>
                                                    <TextBlock Foreground="{Binding Path=Name.EntryColor}" FontWeight="Bold" Text=" Entries: "/>
                                                    <TextBlock Foreground="{Binding Path=Name.EntryColor}" FontWeight="Bold" Text="{Binding Path=ItemCount}"/>
                                                </DockPanel>
                                            </Expander.Header>
                                            <Expander.Content>
                                                <ItemsPresenter />
                                            </Expander.Content>
                                        </Expander>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </GroupStyle.ContainerStyle>
                </GroupStyle>
            </ListView.GroupStyle>
            </ListView>

现在，它不能完全正常工作 - 我无法让CollectionViewSource基于内部集合工作（每个EntrySet包含应该是实际数据源的Entries集合 - EntrySet用于分组和自定义组头显示）。

当前代码给出以下结果：因此，这表明绑定'排序'有效，但组内不包含实际条目（只有DailyDetailEntry和DailyDetailSet中相同的单个属性。）

如何使listview使用集合的集合属性作为项目源？我在绑定中尝试了很多不同的ItemsSource声明，包括指定Path或类似<CollectionViewSource x:Key="Sets" Source="{Binding Path=EntrySets/Entries}">的语法，但在大多数情况下结果更糟。

WPF将集合集合绑定到父集合对象属性上的列表视图和组

0 个答案: