<转>如何C#中实现在TreeView查找某一节点

TreeView查找某一节点,通常有两种方法,一种是递归的,一种不是递归,但都是深度优先算法。其中,非递归方法效率高些,而递归算法要简洁一些。

 

第一种,递归算法,代码如下:

    private TreeNode FindNode( TreeNode tnParent, string strValue )

    {

        if( tnParent == null ) return null;

        if( tnParent.Text == strValue ) return tnParent;

 

        TreeNode tnRet = null;

        foreach( TreeNode tn in tnParent.Nodes )

        {

            tnRet = FindNode( tn, strValue );

            if( tnRet != null ) break;

        }

        return tnRet;

    }

 

第二种,非递归算法,代码如下:

    private TreeNode FindNode( TreeNode  tnParent, string strValue )

    {

        if( tnParent == null ) return null;

 

        if( tnParent.Text == strValue ) return tnParent;

        else if( tnParent.Nodes.Count == 0 ) return null;

 

        TreeNode tnCurrent, tnCurrentPar;

 

        //Init node

        tnCurrentPar = tnParent;

        tnCurrent = tnCurrentPar.FirstNode;

 

        while( tnCurrent != null && tnCurrent != tnParent )

        {

            while( tnCurrent != null )

            {

                if( tnCurrent.Text == strValue ) return tnCurrent;

                else if( tnCurrent.Nodes.Count > 0 )

                {

                    //Go into the deepest node in current sub-path

                    tnCurrentPar = tnCurrent;

                    tnCurrent = tnCurrent.FirstNode;

                }

                else if( tnCurrent != tnCurrentPar.LastNode )

                {

                    //Goto next sible node

                    tnCurrent = tnCurrent.NextNode;

                }

                else

                    break;

            }

               

            //Go back to parent node till its has next sible node

            while( tnCurrent != tnParent && tnCurrent == tnCurrentPar.LastNode )

            {

                tnCurrent = tnCurrentPar;

                tnCurrentPar = tnCurrentPar.Parent;

            }

 

            //Goto next sible node

            if( tnCurrent != tnParent )

                tnCurrent = tnCurrent.NextNode;

        }

        return null;

    }

 

       程序调用,如下:

        TreeNode tnRet = null;

        foreach( TreeNode tn in yourTreeView.Nodes )

        {

            tnRet =  FindNode( tn, yourValue );

            if( tnRet != null ) break;

        }


源自:http://blog.csdn.net/Knight94/archive/2006/03/29/642736.aspx

posted on 2007-12-26 16:24 西门潇洒 阅读(...) 评论(...) 编辑 收藏

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