我在XAML中声明了element。
RibbonComboBox由于我不完全理解的原因，为了操纵组合框中的项目，我需要<RibbonGroup Header="Category">
<RibbonComboBox Name="cboCategory" Label="Category" HorizontalContentAlignment="Left">
<RibbonGallery Name="galCategory">
<RibbonGalleryCategory Name="catCategory" DisplayMemberPath="Text">
</RibbonGalleryCategory>
</RibbonGallery>
</RibbonComboBox>
<RibbonComboBox Name="cboSubcategory" Label="Subcategory:" HorizontalContentAlignment="Left">
<RibbonGallery Name="galSubcategory">
<RibbonGalleryCategory Name="catSubcategory" DisplayMemberPath="Text">
</RibbonGalleryCategory>
</RibbonGallery>
</RibbonComboBox>
</RibbonGroup>
的一些成员，我需要RibbonComboBox的其他成员，而某些任务需要成员{ {1}}。
因此，根据RibbonGallery的实例，如何找到子RibbonGalleryCategory和RibbonComboBox元素？没有RibbonGallery或RibbonGalleryCategory属性。
我在网上找到了以下代码，用于查找控件的子元素：
Controls但是，当这段代码编译时，Children总是在我通过我的组合框时返回0。所以无法找到对照的孩子。
修改
通过名称protected T GetChildOfType<T>(DependencyObject depObj) where T : DependencyObject
{
if (depObj == null)
return null;
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
{
var child = VisualTreeHelper.GetChild(depObj, i);
var result = (child as T) ?? GetChildOfType<T>(child);
if (result != null)
return result;
}
return null;
}
，我假设这个类是用于查找可视元素，并且库可能不是一个单独的可视元素。所以我想我需要知道如何遍历不可视的子元素？
答案 0 :(得分：2)
我做了两种不同的方法。一个是嵌套元素，一个是简单的ComboBox。按钮填充并阅读ComboBox和RibbonGalleryCategory
<强> XAML
<StackPanel>
<Button Content="Fill me :)" Width="80" Height="20" Click="FillMe_OnClick"/>
<Ribbon>
<RibbonGroup Header="Category">
<RibbonComboBox Name="cboCategory" Label="Category" HorizontalContentAlignment="Left">
<ComboBoxItem>Item 1</ComboBoxItem>
<ComboBoxItem>Item 2</ComboBoxItem>
<ComboBoxItem>Item 3</ComboBoxItem>
<ComboBoxItem>Item 4</ComboBoxItem>
</RibbonComboBox>
<RibbonComboBox Name="cboSubcategory" Label="Subcategory:" HorizontalContentAlignment="Left">
<RibbonGallery Name="galSubcategory">
<RibbonGalleryCategory Name="catSubcategory" DisplayMemberPath="Text">
</RibbonGalleryCategory>
</RibbonGallery>
</RibbonComboBox>
</RibbonGroup>
</Ribbon>
<Button Content="Read me" Width="80" Height="20" Click="ReadMeCat_OnClick"></Button>
<Button Content="Read me too" Width="80" Height="20" Click="ReadMeCombo_OnClick"></Button>
</StackPanel>
<强>代码隐藏
public MainWindow()
{
InitializeComponent();
}
private void FillMe_OnClick(object sender, RoutedEventArgs e)
{
this.catSubcategory.Items.Add(new { Text = "Hello" });
this.catSubcategory.Items.Add(new { Text = "World" });
this.catSubcategory.Items.Add(new { Text = "Hello" });
this.catSubcategory.Items.Add(new { Text = "Moon" });
}
private void ReadMeCat_OnClick(object sender, RoutedEventArgs e)
{
var result = catSubcategory.Items.Cast<dynamic>().Aggregate("", (current, xx) => (string) (current + (xx.Text + "\n")));
MessageBox.Show(result);
}
private void ReadMeCombo_OnClick(object sender, RoutedEventArgs e)
{
var result = cboCategory.Items.Cast<ComboBoxItem>().Aggregate("", (current, xx) => current + (xx.Content.ToString() + "\n"));
MessageBox.Show(result);
}
注意
我认为这不需要太多解释。如果您仍然需要，请致电;）
请注意，这不是应该如何完成的。 WPF通过Bindings和MVVM释放它的真正力量。我也可以为你提供这样的例子。
修改
是的，你是对的。除非您使用RibbonGalleryCategory - 方法，否则将显示ComboBox项目但无法选择。
关于这个问题的另一个愚蠢的事情是，RibbonGallery实际上并不是真正的控件。它只是一个带有ControlTemplate的ItemsControl，无法找到VisualTreeHelper。
在我看来，如果你从一开始就不使用MVVM和DataBinding，那么使用那些控件会使一切变得更加复杂。
使用DataBinding，一切都像魅力一样。很遗憾，您仍然需要使用RibbonGallery和RibbonGalleryCategory。或者你只是放置一个Ribbon风格的常见ComboBox
编辑2 - 简单的MVVM方法
<强>代码
public partial class MainWindow : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
public MainWindow()
{
InitializeComponent();
this.Ponies.Add(new Pony() { Id = 0, Color = Brushes.DeepSkyBlue, Name = "Slayer" });
this.Ponies.Add(new Pony() { Id = 1, Color = Brushes.DeepPink, Name = "Murder" });
this.Ponies.Add(new Pony() { Id = 2, Color = Brushes.Yellow, Name = "Brutal" });
this.DataContext = this;
}
private ObservableCollection<Pony> _ponies = new ObservableCollection<Pony>();
private Pony _selectedPony;
public ObservableCollection<Pony> Ponies => this._ponies;
public Pony SelectedPony {
get { return _selectedPony; }
set {
if (this._selectedPony == value) return;
_selectedPony = value;
this.OnPropertyChanged("SelectedPony");
}
}
}
public class Pony : INotifyPropertyChanged
{
public int Id { get; set; }
private string _name;
public string Name {
get { return this._name; }
set {
this._name = value;
this.OnPropertyChanged("Name");
}
}
public Brush Color { get; set; }
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
<强> XAML
<Window x:Class="MyNameSpace.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
x:Name="root"
Title="Try WPF!"
mc:Ignorable="d">
<Grid >
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
<Ribbon>
<RibbonGroup Header="Category">
<RibbonComboBox Label="Category" HorizontalContentAlignment="Left" >
<RibbonGallery SelectedItem="{Binding SelectedPony}">
<RibbonGalleryCategory ItemsSource="{Binding Ponies}" >
<RibbonGalleryCategory.ItemTemplate>
<DataTemplate>
<TextBlock Name="tb" Text="{Binding Name}" Background="{Binding Color}"/>
</DataTemplate>
</RibbonGalleryCategory.ItemTemplate>
</RibbonGalleryCategory>
</RibbonGallery>
</RibbonComboBox>
</RibbonGroup>
</Ribbon>
</Grid>
</Window>
如您所见，功能更多，代码更少：）