显示控件时出现问题

Question

我试图将标签存储在ComboBox中，并带有类别 - 类似this。

但是，组合框项目出现，像这样：

这是我迄今所做的：

的App.xaml

<DataTemplate x:Key="groupStyle"> 
    <Label FontWeight="Bold" Content="{Binding Name}"/> 
</DataTemplate> 

代码背后

ComboBox comboBox1 = new ComboBox(); 

    GroupStyle style = new GroupStyle(); 
    style.HeaderTemplate = (DataTemplate)this.FindResource("groupStyle"); 
    comboBox1.GroupStyle.Add(style); 
    comboBox1.DisplayMemberPath = "Item"; 
    ObservableCollection<CategoryItem<Label>> items = new ObservableCollection<CategoryItem<string>>(); 

    Label label = new Label(); 
    TextBlock block = new TextBlock(); 
    block.Text = "Text"; 
    label.Content = block; 

    items.Add(new CategoryItem<Label> { Category = "Category", Item = label }); 

    CollectionViewSource cvs = new CollectionViewSource(); 
    cvs.GroupDescriptions.Add(new PropertyGroupDescription("Category")); 
    cvs.Source = items; 

    Binding b = new Binding(); 
    b.Source = cvs; 
    BindingOperations.SetBinding(comboBox1, ComboBox.ItemsSourceProperty, b); 

public class CategoryItem<T> 
{ 
    public T Item { get; set; } 
    public string Category { get; 
} 

Answer 1

您应该使用ItemContainerStyle。然而，你可能有App.xaml中看看this

<DataTemplate x:Key="groupStyle"> 
    <TextBlock FontWeight="Bold" Text="{Binding Name}"/> 
</DataTemplate> 
<Style TargetType="{x:Type ComboBoxItem}" x:Key="comboBoxItemStyle"> 
    <Setter Property="Template" > 
     <Setter.Value> 
      <ControlTemplate> 
       <Label Background="Red" Content="{Binding Item}"/> 
      </ControlTemplate> 
     </Setter.Value> 
    </Setter> 
</Style> 

后面的代码：

ComboBox comboBox1 = new ComboBox(); 

GroupStyle style = new GroupStyle(); 
style.HeaderTemplate = (DataTemplate)this.FindResource("groupStyle"); 
comboBox1.GroupStyle.Add(style); 
comboBox1.DisplayMemberPath = "Item"; 

// Here is what you are looking for 
comboBox1.ItemContainerStyle = (Style)this.FindResource("comboBoxItemStyle"); 


ObservableCollection<CategoryItem<string>> items = new ObservableCollection<CategoryItem<string>>(); 

CollectionViewSource cvs = new CollectionViewSource(); 
cvs.GroupDescriptions.Add(new PropertyGroupDescription("Category")); 
cvs.Source = items; 

Binding b = new Binding(); 
b.Source = cvs; 
BindingOperations.SetBinding(
      comboBox1, ComboBox.ItemsSourceProperty, b);