Question

我有一个Treeview，在选择节点时，必须在列表框中显示属性和值在treeView1_AfterSelect中，文本解析代码依赖于树视图中节点的文本表示，可以随时更改并打破列表显示的整个逻辑。树视图和列表显示之间的这种强依赖性应该通过将树视图中的节点绑定到XML文档的节点来消除，这样原始的Xml数据就可以用来显示列表中的文本。我应该在这里写什么？ / p>

private static void AddingNodesToTree(XmlNode xmlNode,TreeNode tnode)  
        {  
            //Adding nodes to tree while looping through the entire XML file  
            if (xmlNode.HasChildNodes)  
            {  
                XmlNodeList nodeList = xmlNode.ChildNodes;                 
                for (int i = 0; i <= nodeList.Count - 1; i++)  
                {  
                    XmlNode xmladdtreeNode = xmlNode.ChildNodes[i];  
                    String nodetype = "" + xmladdtreeNode.NodeType;  
                    if (nodetype.Equals("Text") || nodetype.Equals("Comment"))    
                    {  
                    tnode.Nodes.Add(new TreeNode(xmladdtreeNode.InnerText));           
                    }  
                    else                                                    
                    {  
                        String name = "<" + xmladdtreeNode.Name;  
                        XmlAttributeCollection attCol = xmladdtreeNode.Attributes; 
                        foreach (XmlAttribute xmlatt in attCol)  
                        {  
                        name += " " + xmlatt.Name + "=\"" + xmlatt.Value + "\"";  
                        }  
                        name +=  ">";  
                        TreeNode tn = new TreeNode(xmladdtreeNode.Name);  
                        tn.Text = name;  
                        tnode.Nodes.Add(tn);  
                        TreeNode treeNode = tnode.Nodes[i];  
                        AddingNodesToTree(xmladdtreeNode,treeNode);   
                        }  
                }//for  
            }//if  
          else 
            {  
                tnode.Text = xmlNode.OuterXml.Trim();
            }//else   
        }//AddingNodesToTree  
        //To show Attributes and values of selected Nodes.  
        private void treeView1_AfterSelect(object sender,TreeViewEventArgs e)  
        {  
            TreeNode treenode = e.Node;   //Node selected in Treeview            
            String text = treenode.Text;  
            String relevent = text;  
            Boolean flag = true;  
            while (flag)  
            {  
                int SpaceIndex = relevent.IndexOf(" ");  
                if (SpaceIndex != -1)  
                {  
                    int indexofEqual = relevent.IndexOf('=', SpaceIndex);  
                    if (indexofEqual != -1)  
                    {  
                        int indexOFValue = relevent.IndexOf("\"", indexofEqual + 2);  
                        if (indexOFValue != -1)  
                        {  
  String attribute = relevent.Substring(SpaceIndex + 1, indexofEqual - SpaceIndex - 1);   
  String value = relevent.Substring(indexofEqual + 2, indexOFValue - indexofEqual - 2);   
  listBox1.Items.Add("Attribute : " + attribute + "   Value : " + value);                 
                            relevent = relevent.Substring(indexOFValue);
                        }
                        else
                        {
                         listBox1.Items.Add("Bad format of the xml file for this node");
                         flag = false;
                        }
                    }
                    else
                    {
                        flag = false;
                    }
                }
                else
                {
                    flag = false;
                }
            }
        }//AfterSelect()

谢谢....

Answer 1

如果我正确理解了这个问题，你想在选择TreeNode时返回XmlNode。通常的解决方案是将XmlNode存储在Tag属性中：

TreeNode tn = new TreeNode();  
tn.Text = name;  
tn.Tag = xmladdtreeNode;

和AfterSelect

TreeNode treenode = e.Node; 
XmlNode xmlNode = (XmlNode) treeNode.Tag;

Answer 2

我试过这个但是在这一行得到了NullRefrenceException attcol上的 foreach（attCol中的XmlAttribute xmlatt）

这是我写的代码..

private void treeView1_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)
    {
        listBox1.Items.Clear();
        XmlNode xNode = e.Node.Tag as XmlNode;
        XmlAttributeCollection attCol = xNode.Attributes; 
        foreach (XmlAttribute xmlatt in attCol)
        {
            listBox1.Items.Add(xmlatt.Name);
            listBox1.Items.Add(xmlatt.Value);

        }
    } //AfterSelect()

如何通过将树视图中的节点绑定到XML文档的节点来显示treenode

2 个答案: