示例:WPF中TreeView自定义TreeNode泛型绑定对象

news2024/11/27 5:41:12

一、目的：在开发中经常需要绑定TreeView，所以定义了一个泛型的TreeNode<T>用来方便绑定对象和复用

二、实现

    public partial class TreeNodeBase<T> : SelectBindable<T>, ITreeNode
    {
        public TreeNodeBase(T t) : base(t)
        {

        }

        private ObservableCollection<TreeNodeBase<T>> _nodes = new ObservableCollection<TreeNodeBase<T>>();

        public ObservableCollection<TreeNodeBase<T>> Nodes
        {
            get { return _nodes; }
            set
            {
                _nodes = value;
                RaisePropertyChanged();
            }
        }
    }

三、环境

VS2022

四、示例

生成测试数据

    public class GetTestTreeNodes : MarkupExtension
    {
        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            var roots = this.GetTreeNodeBases().ToList();
            foreach (var item in roots)
            {
                var n1 = this.GetTreeNodeBases();
                foreach (var item1 in n1)
                {
                    var n2 = this.GetTreeNodeBases();
                    item1.Nodes = n2.ToObservable();
                }
                item.Nodes = n1.ToObservable();
            }
            return roots;
        }
        private IEnumerable<TreeNodeBase<Student>> GetTreeNodeBases()
        {
            int c = Random.Shared.Next(3, 15);
            for (int i = 0; i < c; i++)
            {
                yield return new TreeNodeBase<Student>(Student.Random());
            }

        }
    }

其中TreeNode<T> 的T使用的测试Student，实际开发中可以使用任意需要的类型，这样在不需要额外定义树结构的情况下可以绑定到树节点上

Xaml中如下绑定

  <TreeView ItemsSource="{local:GetTestTreeNodes}">
                <TreeView.ItemTemplate>
                    <HierarchicalDataTemplate ItemsSource="{Binding Nodes}">
                        <TextBlock VerticalAlignment="Center" Text="{Binding Model.Name}" />
                    </HierarchicalDataTemplate>
                </TreeView.ItemTemplate>
            </TreeView>

显示效果如下