Question

所以我尝试了谷歌的一大堆例子，但我似乎无法给出我的树视图复选框....我唯一能想到的是因为我的树的ItemsSource总是在改变

最值得注意的是HierarchicalDataTemplate：

<HierarchicalDataTemplate 
  x:Key="CheckBoxItemTemplate"
  ItemsSource="{Binding Children, Mode=OneTime}"
  >
  <StackPanel Orientation="Horizontal">
    <!-- These elements are bound to a FooViewModel object. -->
    <CheckBox
      Focusable="False" 
      IsChecked="{Binding IsChecked}" 
      VerticalAlignment="Center"
      />
    <ContentPresenter 
      Content="{Binding Name, Mode=OneTime}" 
      Margin="2,0"
      />
  </StackPanel>
</HierarchicalDataTemplate>

我将树的ItemTemplate设置为：

ItemTemplate="{StaticResource CheckBoxItemTemplate}"

但我看不到复选框。我认为这是因为在示例中，数据绑定到Children ...但在我的示例中，我总是更改itemsSource（从树到树，或编辑它，并将其添加回树等）。 ..

任何人都知道如何让它发挥作用？

谢谢！

*的修改 *

添加treeview itemsSource我就去了

tv_master.ItemsSource = t.TreeItems;

其中t.TreeItems是一个包含顶级节点的List ..

我的树视图：

<my:SpecTreeView Margin="8,8,0,12" 
                         x:Name="tv_local" 
                         TreeViewItem.Selected="node_Selected" HorizontalAlignment="Left" Width="304"
                         x:FieldModifier="private" BorderBrush="Black">

编写复选框代码的人使用的原始类：

using System.Collections.Generic;
using System.ComponentModel;

namespace TreeViewWithCheckBoxes
{
    public class FooViewModel : INotifyPropertyChanged
    {
        #region Data

        bool? _isChecked = false;
        FooViewModel _parent;

        #endregion // Data

        #region CreateFoos

        public static List<FooViewModel> CreateFoos()
        {
            FooViewModel root = new FooViewModel("Weapons")
            {
                IsInitiallySelected = true,
                Children =
                {
                    new FooViewModel("Blades")
                    {
                        Children =
                        {
                            new FooViewModel("Dagger"),
                            new FooViewModel("Machete"),
                            new FooViewModel("Sword"),
                        }
                    },
                    new FooViewModel("Vehicles")
                    {
                        Children =
                        {
                            new FooViewModel("Apache Helicopter"),
                            new FooViewModel("Submarine"),
                            new FooViewModel("Tank"),                            
                        }
                    },
                    new FooViewModel("Guns")
                    {
                        Children =
                        {
                            new FooViewModel("AK 47"),
                            new FooViewModel("Beretta"),
                            new FooViewModel("Uzi"),
                        }
                    },
                }
            };

            root.Initialize();
            return new List<FooViewModel> { root };
        }

        FooViewModel(string name)
        {
            this.Name = name;
            this.Children = new List<FooViewModel>();
        }

        void Initialize()
        {
            foreach (FooViewModel child in this.Children)
            {
                child._parent = this;
                child.Initialize();
            }
        }

        #endregion // CreateFoos

        #region Properties

        public List<FooViewModel> Children { get; private set; }

        public bool IsInitiallySelected { get; private set; }

        public string Name { get; private set; }

        #region IsChecked

        /// <summary>
        /// Gets/sets the state of the associated UI toggle (ex. CheckBox).
        /// The return value is calculated based on the check state of all
        /// child FooViewModels.  Setting this property to true or false
        /// will set all children to the same check state, and setting it 
        /// to any value will cause the parent to verify its check state.
        /// </summary>
        public bool? IsChecked
        {
            get { return _isChecked; }
            set { this.SetIsChecked(value, true, true); }
        }

        void SetIsChecked(bool? value, bool updateChildren, bool updateParent)
        {
            if (value == _isChecked)
                return;

            _isChecked = value;

            if (updateChildren && _isChecked.HasValue)
                this.Children.ForEach(c => c.SetIsChecked(_isChecked, true, false));

            if (updateParent && _parent != null)
                _parent.VerifyCheckState();

            this.OnPropertyChanged("IsChecked");
        }

        void VerifyCheckState()
        {
            bool? state = null;
            for (int i = 0; i < this.Children.Count; ++i)
            {
                bool? current = this.Children[i].IsChecked;
                if (i == 0)
                {
                    state = current;
                }
                else if (state != current)
                {
                    state = null;
                    break;
                }
            }
            this.SetIsChecked(state, false, true);
        }

        #endregion // IsChecked

        #endregion // Properties

        #region INotifyPropertyChanged Members

        void OnPropertyChanged(string prop)
        {
            if (this.PropertyChanged != null)
                this.PropertyChanged(this, new PropertyChangedEventArgs(prop));
        }

        public event PropertyChangedEventHandler PropertyChanged;

        #endregion
    }
}

我的TNode课程

public class TNode : TreeViewItem{

    public int Level { get; set; }
    public Boolean IsCheckedStr { get; set; }
    public string Section { get; set; }
    public string Note { get; set; }
    public Boolean Locked { get; set; }
    public string ID { get; set; }
    public int Hierarchy { get; set; }
    public string Type { get; set; }
    public Boolean HasChildren { get; set; }
    public string TextBlock { get; set; }
    public Boolean ShowDetails { get; set; }
    public List<TNode> Dependencies { get; set; }
    public TNode(string id) {
        ID = id;
        Dependencies = new List<TNode>();
    }

我只是想让复选框暂时出现：（

如果您还有其他想看的话，请告诉我

Answer 1

编辑： DataTemplates用于数据，TreeViewItems或其子类是 not 数据，模板将被忽略。您应该在Visual Studio的Output-window中看到有关此错误（这有助于调试任何类型的数据绑定问题）。

看到没有错，您可能想要发布类的代码和TreeView实例声明。

常见错误是缺少通知接口。另外：您是否将TreeView本身的ItemsSource绑定到项目的根列表？

如何使用动态ItemsSource向树视图添加复选框？

1 个答案: