如何通过将树视图中的节点绑定到 XML 文档的节点来显示树节点 [英] How to display treenodes by binding nodes in the treeview to nodes of the XML document

问题描述

我有一个 Treeview，在其中选择一个节点时，属性和值必须显示在列表框中.
在treeView1_AfterSelect中，文本解析代码依赖于树视图中某个节点的文本表示，可以随时更改，破坏了整个列表显示逻辑.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，以便原始 Xml 数据可以用于显示列表中的文本.我应该在这里写什么?

I have a Treeview where on selecting a node the attributes and values has to be displayed in listbox.
In treeView1_AfterSelect, the text parsing code depends on the textual representation for a node in the tree view, which can be changed at any time and break the entire logic of list display. This strong dependency between the tree view and the list display should be eliminated by binding nodes in the treeview to nodes of the XML document, so that the raw Xml data can be used to display text in the list.What should i write here?

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....

推荐答案

如果我正确理解了问题，您希望在选择 TreeNode 时返回 XmlNode.通常的解决方案是将 XmlNode 存储在 Tag 属性中:

If I understand the question correctly you want to get back to the XmlNode when a TreeNode is selected. The usual solution is to store the XmlNode in the Tag property:

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

并在 AfterSelect 中

and in the AfterSelect

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

这篇关于如何通过将树视图中的节点绑定到 XML 文档的节点来显示树节点的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！