将多个TreeViews显示为WPF中TreeViewItems列表的ObservableCollection

using System.Collections.ObjectModel;
using System.Linq;
using System.Windows.Controls;

public ObservableCollection<TreeViewItem> MergeTreeViews(TreeView... treeViews)
{
    var mergedCollection = new ObservableCollection<TreeViewItem>();

    foreach (var treeView in treeViews)
    {
        AddTreeItemsToCollection(treeView.Items, mergedCollection);
    }

    return mergedCollection;
}

private void AddTreeItemsToCollection(ItemCollection items, ObservableCollection<TreeViewItem> collection)
{
    foreach (TreeViewItem item in items)
    {
        collection.Add(item);

        // Recursively add child items
        if (item.HasItems)
        {
            AddTreeItemsToCollection(item.Items, collection);
        }
    }
}

// 假设你已经在XAML中定义了treeView1和treeView2
var mergedItems = MergeTreeViews(treeView1, treeView2);

// 现在mergedItems包含了两个TreeView的所有项

private void AddTreeItemsToCollection(ItemCollection items, ObservableCollection<TreeViewItem> collection)
{
    foreach (TreeViewItem item in items)
    {
        if (!collection.Contains(item))
        {
            collection.Add(item);
            if (item.HasItems)
            {
                AddTreeItemsToCollection(item.Items, collection);
            }
        }
    }
}