这个分组组合框绑定有什么问题？ [英] What's wrong with this grouped combobox binding?

问题描述

我有一个datagridtemplate列，上面有一个分组的组合框。项目显示正确，但标题不正确，实际上显示空格。



我更改了标题字段以匹配显示的数据，标题仍然显示为空。在headertemplate中是否有一个不同于itemtemplate的绑定？



Combobox绑定到一个listcollection视图，其中包含两个字段：Bienes_ID和TipoBienes_ID，并在TipoBienes_ID上进行分组。 br />


主数据网格绑定到包含多个字段的数据视图，包括Bienes_ID。

 <   DataGridTemplateColumn     x：名称  =   ColumnaCombo >  
 <   DataGridTemplateColumn.CellTemplate    >  
 <   DataTemplate    >  
 <   TextBlock    文字  =  {Binding Path = Bienes_ID} >  <   / TextBlock   >  
 <   / DataTemplate  >  
 <   / DataGridTemplateColumn.CellTemplate  >  
 <   DataGridTemplateColumn.CellEditingTemplate    >  
 <   DataTemplate    > ;  
 <   ComboBox     x：名称  =  ComboBienesAgrupados      SelectedValuePath   =  Bienes_ID    ItemsSource   =  {Binding Path = Lista Bienes，RelativeSource = {RelativeSource AncestorType = Window}，UpdateSourceTrigger = PropertyChanged}    SelectedValue  < span class =code-keyword> =  {Binding Bienes_ID}     >  
 <   ComboBox.GroupStyle    >  
 < span class =code-keyword><   GroupStyle  >  
 <   GroupStyle.HeaderTemplate  >  
 <   DataTemplate    >  
 <   TextBox         Text   =  {Binding Path = Bienes_ID}   背景    = < span class =code-keyword> AliceBlue   >  <   / TextBox  >  
 <   / DataTemplate  >  
 <   / GroupStyle.HeaderTemplate  >  
 <   / GroupStyle  >  
 <   / ComboBox.GroupStyle  >  
 <   ComboBox.ItemTemplate    >  
 <   DataTemplate    >  
 
 <   TextBlock    文本  =  {Binding Path = Bienes_ID} >  <   / TextBlock  >  
 <   / DataTemplate  >  
 <   / ComboBox.ItemTemplate  < span class =code-keyword>>  
 <   / ComboBox  >  
 <   / DataTemplate  >  
 <   / DataGridTemplateColumn.CellEditingTemplate  >  
 <   / DataGridTemplateColumn  >  
 

我的尝试：



我设法在itemtemplate中显示TipoBienes_ID字段，所以只有headertemplate没有正确绑定。

解决方案

显然有一个技巧，在标题中我我没有绑定数据视图中的数据对象。相反，我绑定了PropertyGroupDescription对象。因此，不必绑定到TipoBienes_ID，我必须绑定到PropertyGroupDescription.name属性，如下所示：

 <   combobox.groupstyle  >  
 <   groupstyle  >  
 <   groupstyle.headertemplate  >  
 <   datatemplate  >  
 <   textbox     text   =  {Binding Path = Name}    background   =  AliceBlue >  <   / textbox  >  
 <   / datatemplate  >  
 <   / groupstyle.headertemplate  >  
 <   / groupstyle  >  
 
 <   / combobox.groupstyle  >  

I have a datagridtemplatecolumn with a grouped combobox on it. The items are displayed correctly, but the headers are not, actually a blank space appears.

I changed the Header field to match the same as the displayed data and the header still appears empty. Is there a different binding in the headertemplate than in the itemtemplate?

The Combobox is binded to a listcollection view with two fields: Bienes_ID and TipoBienes_ID with grouping on TipoBienes_ID.

The main datagrid is binded to a dataview with several fields, including Bienes_ID.

<DataGridTemplateColumn x:Name="ColumnaCombo">
                      <DataGridTemplateColumn.CellTemplate >
                          <DataTemplate >
                              <TextBlock Text="{Binding Path=Bienes_ID}"></TextBlock>
                          </DataTemplate>
                      </DataGridTemplateColumn.CellTemplate>
                      <DataGridTemplateColumn.CellEditingTemplate >
                          <DataTemplate >
                              <ComboBox x:Name="ComboBienesAgrupados"  SelectedValuePath="Bienes_ID" ItemsSource="{Binding Path=ListaBienes, RelativeSource={RelativeSource AncestorType=Window},UpdateSourceTrigger=PropertyChanged }" SelectedValue="{Binding Bienes_ID}"  >
                                  <ComboBox.GroupStyle >
                                      <GroupStyle>
                                          <GroupStyle.HeaderTemplate>
                                              <DataTemplate >
                                                  <TextBox   Text="{Binding  Path =Bienes_ID }" Background ="AliceBlue" ></TextBox>
                                              </DataTemplate>
                                          </GroupStyle.HeaderTemplate>
                                      </GroupStyle>
                                  </ComboBox.GroupStyle>
                                  <ComboBox.ItemTemplate >
                                      <DataTemplate >

                                          <TextBlock Text="{Binding Path=Bienes_ID}"></TextBlock>
                                      </DataTemplate>
                                  </ComboBox.ItemTemplate>
                              </ComboBox>
                          </DataTemplate>
                      </DataGridTemplateColumn.CellEditingTemplate>
                  </DataGridTemplateColumn>

What I have tried:

I managed to show in the itemtemplate the fields TipoBienes_ID, so only the headertemplate is not binding correctly.

解决方案

Apparently there is a trick, in the header I am not binding against a data object from my dataview. Instead I am binding against PropertyGroupDescription object. So instead of binding to TipoBienes_ID I had to Bind to the PropertyGroupDescription.name property like this:

<combobox.groupstyle>
    <groupstyle>
          <groupstyle.headertemplate>
               <datatemplate>
                   <textbox text="{Binding  Path =Name}" background="AliceBlue"></textbox>
               </datatemplate>
          </groupstyle.headertemplate>
    </groupstyle>

</combobox.groupstyle>

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