HierarchicalDataTemplate不工作 [英] HierarchicalDataTemplate not working
本文介绍了HierarchicalDataTemplate不工作的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图用一个HierarchicalDataTemplate递归创建在他们的项目扩展，但是当我用HierarchicalDataTemplate我只得到显示项目的第一级。
请让我知道如果你需要anyore信息。
继承人的什么XAML会是什么样子，如果我分组框标题=SectionHeader>
<的：手写
<&StackPanel的GT;
<扩展VerticalAlignment =评出的标题=SubSectionHeader>
<&StackPanel的GT;
<扩展VerticalAlignment =评出的标题=SubSectionHeader保证金=10,0,0,0>
<&StackPanel的GT;
等......
< / StackPanel的>
< /扩展>
< /扩展>
< / StackPanel的>
< /分组框中>
下面有什么，我有这么远。
XAML中：
< ItemsControl的名称=lstMain的ItemsSource ={结合部分}>
< ItemsControl.ItemTemplate>
<&DataTemplate的GT;
<分组框标题={结合Section.SectionName}>
<的ItemsControl的ItemsSource ={结合小节}的ItemTemplate ={StaticResource的BinderTemplate}/>
< /分组框中>
< / DataTemplate中>
< /ItemsControl.ItemTemplate>
< / ItemsControl的>
< HierarchicalDataTemplate X：键=BinderTemplate的ItemsSource ={绑定路径=小节}数据类型={X：类型本地：SubSectionViewModel}>
<&StackPanel的GT;
<扩展报头={结合SubSection.SubSectionName}/>
< / StackPanel的>
< / HierarchicalDataTemplate>
数据类：
类TopViewModel
{
&的ObservableCollection LT; SectionViewModel> _sections =新的ObservableCollection< SectionViewModel>（）;
公众的ObservableCollection< SectionViewModel>第
{
得到
{
返回_sections;
}
组
{
_sections =价值;
}
}
}
公共类SectionViewModel
{
&的ObservableCollection LT; MaterialViewModel> _materials =新的ObservableCollection< MaterialViewModel>（）;
&的ObservableCollection LT; SubSectionViewModel> _subSections =新的ObservableCollection< SubSectionViewModel>（）;
节_section;
公共部门第
{
得到
{
返回_section;
}
组
{
_section =价值;
}
}
公共字符串MaterialName
{
{返回Section.SectionName; }
集合{Section.SectionName =价值; }
}
公众的ObservableCollection< MaterialViewModel>材料
{
得到
{
返回_materials;
}
组
{
_materials =价值;
}
}
公众的ObservableCollection< SubSectionViewModel>小节
{
得到
{
返回_subSections;
}
组
{
_subSections =价值;
}
}
}
公共类SubSectionViewModel
{
&的ObservableCollection LT; MaterialViewModel> _materials =新的ObservableCollection< MaterialViewModel>（）;
&的ObservableCollection LT; SubSectionViewModel> _subSections =新的ObservableCollection< SubSectionViewModel>（）;
款_subSection;
公众的ObservableCollection< MaterialViewModel>材料
{
得到
{
返回_materials;
}
组
{
_materials =价值;
}
}
公众的ObservableCollection< SubSectionViewModel>小节
{
得到
{
返回_subSections;
}
组
{
_subSections =价值;
}
}
款大众款
{
得到
{
返回_subSection;
}
组
{
_subSection =价值;
}
}
}
解决方案
您缺少在 HierarchicalDataTemplate A键位 - 如何渲染子元素：
< HierarchicalDataTemplate X：键=BinderTemplate
的ItemsSource ={绑定路径=小节}
数据类型={X：类型本地：SubSectionViewModel}>
<&StackPanel的GT;
<扩展报头={结合SubSection.SubSectionName}>
< ItemsControl的保证金=5,0,0,0
的ItemsSource ={结合小节}
的ItemTemplate ={DynamicResource BinderTemplate}/>
< /扩展>
< / StackPanel的>
< / HierarchicalDataTemplate>
编辑：不偷@ BDE的风头，但他/她对使用的大多是正确的数据类型 - 但这是你简化的方式，上述XAML：
<窗口x：类=WpfApplication1.Window1
的xmlns =http://schemas.microsoft.com/winfx/2006/xaml/presentation
的xmlns：X =HTTP： //schemas.microsoft.com/winfx/2006/xaml
的xmlns：地方=CLR的命名空间：WpfApplication1
标题=窗口1HEIGHT =300WIDTH =300>
< Window.Resources>
<！ - 对部分普通模板 - >
<数据类型的DataTemplate ={X：类型本地：SectionViewModel}>
<分组框标题={结合Section.SectionName}>
<的ItemsControl的ItemsSource ={结合小节}/>
< /分组框中>
< / DataTemplate中>
<！ - 为小节分层模板 - >
< HierarchicalDataTemplate
数据类型={X：类型本地：SubSectionViewModel}>
<&StackPanel的GT;
<扩展报头={结合SubSection.SubSectionName}>
< ItemsControl的保证金=5,0,0,0
的ItemsSource ={结合小节}/>
< /扩展>
< / StackPanel的>
< / HierarchicalDataTemplate>
< /Window.Resources>
<网格和GT;
< - ！
无需指定的ItemTemplate如果能WPF苏斯所有的项目类型
- >
< ItemsControl的名称=lstMain的ItemsSource ={结合}节/>
< /网格和GT;
< /窗GT;
I am trying to use a HierarchicalDataTemplate to recursively create expanders with items in them but when I use the HierarchicalDataTemplate I only get the first level of items displayed.
Please let me know if you need anyore information.
Heres the what the xaml would look like if I was writing by hand:
<GroupBox Header="SectionHeader">
<StackPanel >
<Expander VerticalAlignment="Top" Header="SubSectionHeader">
<StackPanel>
<Expander VerticalAlignment="Top" Header="SubSectionHeader" Margin="10,0,0,0">
<StackPanel>
etc......
</StackPanel>
</Expander>
</Expander>
</StackPanel>
</GroupBox>
Heres what I have so far.
Xaml:
<ItemsControl Name="lstMain" ItemsSource="{Binding Sections}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<GroupBox Header="{Binding Section.SectionName}">
<ItemsControl ItemsSource="{Binding SubSections}" ItemTemplate="{StaticResource BinderTemplate}" />
</GroupBox>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<HierarchicalDataTemplate x:Key="BinderTemplate" ItemsSource="{Binding Path=SubSections}" DataType="{x:Type local:SubSectionViewModel}">
<StackPanel>
<Expander Header="{Binding SubSection.SubSectionName}"/>
</StackPanel>
</HierarchicalDataTemplate>
Data Classes:
class TopViewModel
{
ObservableCollection<SectionViewModel> _sections = new ObservableCollection<SectionViewModel>();
public ObservableCollection<SectionViewModel> Sections
{
get
{
return _sections;
}
set
{
_sections = value;
}
}
}
public class SectionViewModel
{
ObservableCollection<MaterialViewModel> _materials = new ObservableCollection<MaterialViewModel>();
ObservableCollection<SubSectionViewModel> _subSections = new ObservableCollection<SubSectionViewModel>();
Section _section;
public Section Section
{
get
{
return _section;
}
set
{
_section = value;
}
}
public string MaterialName
{
get { return Section.SectionName; }
set { Section.SectionName = value; }
}
public ObservableCollection<MaterialViewModel> Materials
{
get
{
return _materials;
}
set
{
_materials = value;
}
}
public ObservableCollection<SubSectionViewModel> SubSections
{
get
{
return _subSections;
}
set
{
_subSections = value;
}
}
}
public class SubSectionViewModel
{
ObservableCollection<MaterialViewModel> _materials = new ObservableCollection<MaterialViewModel>();
ObservableCollection<SubSectionViewModel> _subSections = new ObservableCollection<SubSectionViewModel>();
SubSection _subSection;
public ObservableCollection<MaterialViewModel> Materials
{
get
{
return _materials;
}
set
{
_materials = value;
}
}
public ObservableCollection<SubSectionViewModel> SubSections
{
get
{
return _subSections;
}
set
{
_subSections = value;
}
}
public SubSection SubSection
{
get
{
return _subSection;
}
set
{
_subSection = value;
}
}
}
解决方案
You are missing a key bit in your HierarchicalDataTemplate - how to render the subelements:
<HierarchicalDataTemplate x:Key="BinderTemplate"
ItemsSource="{Binding Path=SubSections}"
DataType="{x:Type local:SubSectionViewModel}">
<StackPanel>
<Expander Header="{Binding SubSection.SubSectionName}">
<ItemsControl Margin="5,0,0,0"
ItemsSource="{Binding SubSections}"
ItemTemplate="{DynamicResource BinderTemplate}"/>
</Expander>
</StackPanel>
</HierarchicalDataTemplate>
EDIT: Not to steal @BDE's thunder, but he/she's mostly correct about the use of DataType - but this is the way you'd "simplify" the above XAML:
<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication1"
Title="Window1" Height="300" Width="300">
<Window.Resources>
<!-- normal template for sections -->
<DataTemplate DataType="{x:Type local:SectionViewModel}">
<GroupBox Header="{Binding Section.SectionName}">
<ItemsControl ItemsSource="{Binding SubSections}"/>
</GroupBox>
</DataTemplate>
<!-- hierarchical template for subsections -->
<HierarchicalDataTemplate
DataType="{x:Type local:SubSectionViewModel}">
<StackPanel>
<Expander Header="{Binding SubSection.SubSectionName}">
<ItemsControl Margin="5,0,0,0"
ItemsSource="{Binding SubSections}"/>
</Expander>
</StackPanel>
</HierarchicalDataTemplate>
</Window.Resources>
<Grid>
<!--
no need to specify ItemTemplate if WPF can suss out all the item types
-->
<ItemsControl Name="lstMain" ItemsSource="{Binding Sections}"/>
</Grid>
</Window>
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