Winform TreeView 查找下一个节点-白红宇

转载:

public static class TreeViewHelper    {        private static IEnumerable
     
       childNodes(this TreeNode node)        {            return node.Nodes.Cast
      
       ()                       .SelectMany(x => x.selfAndChildNodes());        }         private static IEnumerable
       
         selfAndChildNodes(this TreeNode node)        {            return new List
        
         () { node }                       .Union(node.Nodes.Cast
         
          ()                       .SelectMany(x => x.selfAndChildNodes()));        }         private static IEnumerable
          
            nextNodes(this TreeView tree, TreeNode node) { bool after = false; if (node.Parent == null) return tree.Nodes.Cast
           
            () .Select(x => { bool b = after = after || (node == x); return new { x, b }; }) .Where(x => x.b && x.x != node) .SelectMany(x => new List
            
             () { x.x }.Union(x.x.childNodes())); else return node.Parent.Nodes.Cast
             
              () .Select(x => { bool b = after = after || (node == x); return new { x, b }; }) .Where(x => x.b && x.x != node) .SelectMany(x => new List
              
               () { x.x }.Union(x.x.childNodes())) .Union(tree.nextNodes(node.Parent)); } public static IEnumerable
               
                 NextNodes(this TreeView tree, TreeNode node) { if (tree == null || node == null) return new List
                
                 (); return node.childNodes().Union(tree.nextNodes(node)); } public static IEnumerable
                 
                   NextNodes(this TreeView tree) { if (tree == null || tree.SelectedNode == null) return new List
                  
                   (); return tree.NextNodes(tree.SelectedNode); } }

　　如何调用：

var tn = _Tv.NextNodes().FirstOrDefault(x => Regex.IsMatch(x.Text, "(?i)" + txtKey.Text.Trim()));

if (tn == null)

MessageBox.Show("查找完毕");

else

_Tv.SelectedNode = tn;

public static IEnumerable
      
        TreeWhere(this TreeNodeCollection tds, Func
       
         Fun)        {            foreach (TreeNode item in tds)            {                if (Fun(item))                    yield return item;                var list = item.Nodes.TreeWhere(Fun);                foreach (var item1 in list)                    yield return item1;            }        }

如何调用：

var tn = treeView1.Nodes.TreeWhere(x => Regex.IsMatch(x.Text, @"(?i)" + txtKey.Text.Trim()));

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