[英]Cannot bind to ListBox child of ListBox
我綁定到一個列表框,並在列表框內,另一個列表框。
我的模特看起來像
public interface ICriteriaDetail
{
string Title { get; }
int NumberOfEvents { get; }
ICriteriaDetail ChildCriteria { get; }
}
因此,我正在為孩子使用遞歸方法(而不是列表)。
當我綁定到ListView時,我將這些項放在一個列表中,一個在另一個下。
問題是,子項根本沒有顯示!
虛擬數據
public static IEnumerable<ICriteriaDetail> GetCriteriaList()
{
var list = new List<CompoundCriteria.Ui.Model.Interfaces.ICriteriaDetail>();
list.Add(GetCriteriaDetail("My Title", 5, false));
list.Add(GetCriteriaDetail("Other", 3, false));
list.Add(GetCriteriaDetail("Biggy", 8, true));
var child = new CompoundCriteria.Ui.Model.CriteriaDetail.CriteriaDetail("childAgain", 43, null);
var child2 = new CompoundCriteria.Ui.Model.CriteriaDetail.CriteriaDetail("childAgainAgain", 13, child);
list.Add(new CompoundCriteria.Ui.Model.CriteriaDetail.CriteriaDetail("Really big", 86, new CompoundCriteria.Ui.Model.CriteriaDetail.CriteriaDetail("smaller", 15, child2)));
return list;
}
private static ICriteriaDetail GetCriteriaDetail(string title, int events, bool hasChild)
{
if (!hasChild)
return new CompoundCriteria.Ui.Model.CriteriaDetail.CriteriaDetail(title, events, null);
var child = new CompoundCriteria.Ui.Model.CriteriaDetail.CriteriaDetail("child" + title, 13 + events, null);
return new CompoundCriteria.Ui.Model.CriteriaDetail.CriteriaDetail(title, events, child);
}
ViewModel
public MainWindowViewModel()
{
this.Criterias = DatasourceMockup.GetCriteriaList();
}
private IEnumerable<ICriteriaDetail> _criterias;
public IEnumerable<ICriteriaDetail> Criterias
{
get { return _criterias; }
set { _criterias = value; }
}
還有XAML中的ListBox
<ListBox ItemsSource="{Binding Criterias}" >
<ListBox.Resources>
<ControlTemplate x:Key="con">
<StackPanel Orientation="Horizontal">
<StackPanel Margin="15">
<TextBlock Text="{Binding Title}" />
<TextBlock Text="Events: ">
<Run Text="{Binding NumberOfEvents}" />
</TextBlock>
</StackPanel>
<ListBox ItemsSource="{Binding ChildCriteria} Visibility="{Binding ChildCriteria, Converter={StaticResource HideIfNull}}">">
<ListBox.Resources>
<DataTemplate DataType="{x:Type cDetail:CriteriaDetail}">
<TextBlock Text="{Binding Title}" />
</DataTemplate>
</ListBox.Resources>
</ListBox>
</StackPanel>
</ControlTemplate>
<HierarchicalDataTemplate DataType="{x:Type cDetail:CriteriaDetail}">
<Control Template="{StaticResource con}" />
</HierarchicalDataTemplate>
</ListBox.Resources>
</ListBox>
閱讀TreeView,HierarchicalDataTemplate和遞歸數據后 ,似乎HierarchicalDataTemplate
就足夠了(也不需要DataTemplate),但是我迷失了為什么我看不到預期的結果(即使孩子不在理想的地方,我還是希望看到他們)
編輯
我剛剛添加了一個轉換器,如果綁定數據為null,則該轉換器會使ListBox(ControlTemplate內部的一個)隱藏。 我只有3個中的1個(正確)的輪廓(一個空的ListBox),但是它沒有綁定任何內容(標題)。 輸出窗口顯示沒有任何用處...
請注意,兒童沒有限制。 在上面的示例中,有一個父子關系,但也可能是parent-child-child-child等
1)很難理解您的目的,如果您的模型中有ChildCriteria
,而不是IEnumerable<ICriteriaDetail>
,為什么要使用ListBox?
2)你也有綁定錯誤,我改變了XAML
<ListBox ItemsSource="{Binding Criterias}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<StackPanel Margin="15">
<TextBlock Text="{Binding Title}" />
<TextBlock Text="Events: ">
<Run Text="{Binding NumberOfEvents}" />
</TextBlock>
</StackPanel>
<TextBox Text="{Binding Path=DataContext.ChildCriteria.Title,
RelativeSource={RelativeSource Mode=FindAncestor,
AncestorType={x:Type ListBoxItem},
AncestorLevel=1}}"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
並得到
EDIT1:1)我將數據模型更改為
public class CriteriaDetail : ICriteriaDetail
{
public CriteriaDetail(string title, int numberOfEvents, IEnumerable<ICriteriaDetail> childCriteria)
{
Title = title;
NumberOfEvents = numberOfEvents;
ChildCriteria = childCriteria;
}
public string Title { get; set; }
public int NumberOfEvents { get; set; }
public IEnumerable<ICriteriaDetail> ChildCriteria { get; set; }
}
2)將xaml更改為
<TreeView ItemsSource="{Binding Criterias}">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding ChildCriteria}">
<TextBlock Foreground="Red" Text="{Binding Title}"/>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
3)將GetCriteriaDetail更改為
private static ICriteriaDetail GetCriteriaDetail(string title, int events, bool hasChild)
{
if (!hasChild)
return new CriteriaDetail(title, events, null);
var child3 = new CriteriaDetail("child3" + title, 13 + events, null);
var child2 = new CriteriaDetail("child2" + title, 13 + events, new ICriteriaDetail[] { child3 });
var child1 = new CriteriaDetail("child1" + title, 13 + events, new ICriteriaDetail[] { child2 });
return new CriteriaDetail(title, events, new ICriteriaDetail[] {child1});
}
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