添加项目文件。

Wpf.Ui.Extend/UserControls/MultiCheckTreeView.xaml.cs

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+using System.Collections.Generic;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
+using System.Windows.Media;
+
+using Wpf.Ui.Extend.Models;
+
+namespace Wpf.Ui.Extend.UserControls
+{
+    public partial class MultiCheckTreeView : UserControl
+    {
+        /// <summary>
+        ///     构造
+        /// </summary>
+        public MultiCheckTreeView()
+        {
+            InitializeComponent();
+        }
+
+        /// <summary>
+        ///     控件数据
+        /// </summary>
+        private IList<TreeModel> itemsSourceData;
+
+        /// <summary>
+        ///     控件数据
+        /// </summary>
+        public IList<TreeModel> ItemsSourceData
+        {
+            get => itemsSourceData;
+            set
+            {
+                itemsSourceData = value;
+                MultiCheckTree.ItemsSource = itemsSourceData;
+            }
+        }
+
+        /// <summary>
+        ///     获取选中所有项（父节点和子节点）
+        /// </summary>
+        /// <returns></returns>
+        public IList<TreeModel> CheckedItemsIgnoreRelation()
+        {
+            return GetCheckedItemsIgnoreRelation(itemsSourceData);
+        }
+
+        /// <summary>
+        ///     设置对应Id的项为选中状态
+        /// </summary>
+        /// <param name="id"></param>
+        /// <returns></returns>
+        public int SetCheckedById(string id, IList<TreeModel> treeList)
+        {
+            foreach (var tree in treeList)
+            {
+                if (tree.Id.Equals(id))
+                {
+                    tree.IsChecked = true;
+                    return 1;
+                }
+
+                if (SetCheckedById(id, tree.Children) == 1)
+                {
+                    return 1;
+                }
+            }
+
+            return 0;
+        }
+
+        /// <summary>
+        ///     设置对应Id的项为选中状态
+        /// </summary>
+        /// <param name="id"></param>
+        /// <returns></returns>
+        public int SetCheckedById(string id)
+        {
+            foreach (var tree in ItemsSourceData)
+            {
+                if (tree.Id.Equals(id))
+                {
+                    tree.IsChecked = true;
+                    return 1;
+                }
+
+                if (SetCheckedById(id, tree.Children) == 1)
+                {
+                    return 1;
+                }
+            }
+
+            return 0;
+        }
+
+        /// <summary>
+        ///     私有方法，忽略层次关系的情况下，获取选中项
+        /// </summary>
+        /// <param name="list"></param>
+        /// <returns></returns>
+        private IList<TreeModel> GetCheckedItemsIgnoreRelation(IList<TreeModel> list)
+        {
+            IList<TreeModel> treeList = [];
+            foreach (var tree in list)
+            {
+                if (tree.IsChecked == true)
+                {
+                    treeList.Add(tree);
+                }
+
+                //第二次调用方法时由于没有子节点即为空，所以不进行执行下面语句，跳出下面的foreach语句
+                foreach (var child in GetCheckedItemsIgnoreRelation(tree.Children))
+                {
+                    treeList.Add(child);
+                }
+            }
+
+            return treeList;
+        }
+
+        private static DependencyObject VisualUpwardSearch<T>(DependencyObject source)
+        {
+            while (source != null && source.GetType() != typeof(T))
+                source = VisualTreeHelper.GetParent(source);
+
+            return source;
+        }
+
+        /// <summary>
+        ///     全部展开菜单事件
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void menuExpandAll_Click(object sender, RoutedEventArgs e)
+        {
+            if (MultiCheckTree.ItemsSource != null)
+            {
+                foreach (TreeModel tree in MultiCheckTree.ItemsSource)
+                {
+                    tree.IsExpanded = true;
+                    tree.SetChildrenExpanded(true);
+                }
+            }
+        }
+
+        /// <summary>
+        ///     全部选中事件
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void menuSelectAll_Click(object sender, RoutedEventArgs e)
+        {
+            if (MultiCheckTree.ItemsSource != null)
+            {
+                foreach (TreeModel tree in MultiCheckTree.ItemsSource)
+                {
+                    tree.IsChecked = true;
+                    tree.SetChildrenChecked(true);
+                }
+            }
+        }
+
+        /// <summary>
+        ///     选中所有子项菜单事件
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void menuSelectAllChild_Click(object sender, RoutedEventArgs e)
+        {
+            if (MultiCheckTree.SelectedItem != null)
+            {
+                var tree = (TreeModel)MultiCheckTree.SelectedItem;
+                tree.IsChecked = true;
+                tree.SetChildrenChecked(true);
+            }
+        }
+
+        /// <summary>
+        ///     全部折叠菜单事件
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void menuUnExpandAll_Click(object sender, RoutedEventArgs e)
+        {
+            if (MultiCheckTree.ItemsSource != null)
+            {
+                foreach (TreeModel tree in MultiCheckTree.ItemsSource)
+                {
+                    tree.IsExpanded = false;
+                    tree.SetChildrenExpanded(false);
+                }
+            }
+        }
+
+        /// <summary>
+        ///     全部取消选中
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void menuUnSelectAll_Click(object sender, RoutedEventArgs e)
+        {
+            if (MultiCheckTree.ItemsSource != null)
+            {
+                foreach (TreeModel tree in MultiCheckTree.ItemsSource)
+                {
+                    tree.IsChecked = false;
+                    tree.SetChildrenChecked(false);
+                }
+            }
+        }
+
+        private void treeNode_Click(object sender, RoutedEventArgs e)
+        {
+            if (VisualUpwardSearch<TreeViewItem>(e.OriginalSource as DependencyObject) is TreeViewItem item)
+            {
+                item.Focus();
+                if (MultiCheckTree.SelectedItem != null)
+                {
+                    var tree = (TreeModel)MultiCheckTree.SelectedItem;
+                    tree.SetChildrenChecked();
+                    tree.SetParentChecked();
+                }
+
+                e.Handled = true;
+            }
+        }
+
+        /// <summary>
+        ///     鼠标右键事件
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void TreeViewItem_PreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e)
+        {
+            if (VisualUpwardSearch<TreeViewItem>(e.OriginalSource as DependencyObject) is TreeViewItem item)
+            {
+                item.Focus();
+                e.Handled = true;
+            }
+        }
+    }
+}