1 以下是经测试无错的，呵呵，之前在网上看到个代码多多少少有点问题。递归遍历以深度优先，算不得效率高的东西，
　　不过要是树中的项目不是太多，使用上一定是没问题的。到时候有找到效率更好的方法再发上来
  2  /// <summary>   
  3  /// 查找TreeView控件下是否有指定值的节点   
  4  /// </summary>   
  5  /// <param name="tvControl">TreeView控件</param>   
  6  /// <param name="strValue">指定节点值</param>   
  7  /// <returns></returns>   
  8   public static TreeNode FindNode(TreeView tvControl,string strValue)   
  9  {   
 10  TreeNode tnRet = null;   
 11   
 12  foreach (TreeNode tn in tvControl.Nodes)   
 13  {   
 14   
 15  tnRet = FindNode(tn, strValue);   
 16   
 17  if (tnRet != null) break;   
 18   
 19  }   
 20   
 21  return tnRet;   
 22   
 23  }   
 24   
 25  /// <summary>   
 26  /// 查找当前节点下是否有指定值的节点   
 27  /// </summary>   
 28  /// <param name="tnParent">当前节点</param>   
 29  /// <param name="strValue">指定节点值</param>   
 30  /// <returns>TreeNode</returns>   
 31  public static TreeNode FindNode(TreeNode tnParent, string strValue)   
 32  {   
 33  if (tnParent == null) return null;   
 34   
 35  if (tnParent.Value == strValue) return tnParent;   
 36   
 37  TreeNode tnRet = null;   
 38  TreeNode tnTemp = null;   
 39   
 40  foreach (TreeNode tn in tnParent.ChildNodes)   
 41  {   
 42   
 43  tnTemp = FindNode(tn, strValue);   
 44   
 45  if (tnTemp != null && tnTemp.Value == strValue)   
 46  {   
 47  tnRet = tnTemp;   
 48  break;   
 49  }   
 50   
 51  }   
 52   
 53  return tnRet;   
 54   
 55  }  
 56 
 57 /// <summary>
 58  /// 查找TreeView控件下是否有指定值的节点
 59  /// </summary>
 60  /// <param name="tvControl">TreeView控件</param>
 61  /// <param name="strValue">指定节点值</param>
 62  /// <returns></returns>
 63  public static TreeNode FindNode(TreeView tvControl,string strValue)
 64  {
 65  TreeNode tnRet = null;
 66 
 67  foreach (TreeNode tn in tvControl.Nodes)
 68  {
 69 
 70  tnRet = FindNode(tn, strValue);
 71 
 72  if (tnRet != null) break;
 73 
 74  }
 75 
 76  return tnRet;
 77 
 78  }
 79 
 80  /// <summary>
 81  /// 查找当前节点下是否有指定值的节点
 82  /// </summary>
 83  /// <param name="tnParent">当前节点</param>
 84  /// <param name="strValue">指定节点值</param>
 85  /// <returns>TreeNode</returns>
 86  public static TreeNode FindNode(TreeNode tnParent, string strValue)
 87  {
 88  if (tnParent == null) return null;
 89 
 90  if (tnParent.Value == strValue) return tnParent;
 91 
 92  TreeNode tnRet = null;
 93  TreeNode tnTemp = null;
 94 
 95  foreach (TreeNode tn in tnParent.ChildNodes)
 96  {
 97 
 98  tnTemp = FindNode(tn, strValue);
 99 
100  if (tnTemp != null && tnTemp.Value == strValue)
101  {
102  tnRet = tnTemp;
103  break;
104  }
105 
106  }
107 
108  return tnRet;
109 
110  }
111