学步园

http://www.cnblogs.com/wts/archive/2007/03/26/688760.html

前两天被winform的treeview搞晕了，现在终于有时间了，把自己用到的知识简单的写出来。供和我一样初用winform 的treeview的同志批评指正。
        一。treeview的托拽的实现（树与树之间的）：
            首先，你要两棵树了，以treeview1和treeview2来说。设置其allowdrop属性为true。
               添加拖拽函数

private void treeView_ItemDrag(object sender, System.Windows.Forms.ItemDragEventArgs e)
{
            DoDragDrop(e.Item, DragDropEffects.Move);
        }

private void treeView_DragEnter(object sender, System.Windows.Forms.DragEventArgs e)
{
         e.Effect = DragDropEffects.Move;
        }

private void treeView_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
{
            TreeNode NewNode;
if(e.Data.GetDataPresent("System.Windows.Forms.TreeNode", false))
{
                Point pt = ((TreeView)sender).PointToClient(new Point(e.X, e.Y));
                TreeNode DestinationNode = ((TreeView)sender).GetNodeAt(pt);
                NewNode = (TreeNode)e.Data.GetData("System.Windows.Forms.TreeNode");
if(DestinationNode.TreeView != NewNode.TreeView)
{
                    DestinationNode.Nodes.Add((TreeNode) NewNode.Clone());
                    DestinationNode.Expand();
                }
            }
        }

这是实现拖拽在主要代码，接下来就是初始化的时候构造几个节点，在form的page_load函数里加入

private void my1_Load(object sender, System.EventArgs e)
{       
            TreeNode ParentNode1;
            TreeNode ParentNode2;
            ParentNode1 = treeView1.Nodes.Add("WTS");
            ParentNode2.Tag = "";
            ParentNode1.Nodes.Add("WTS1");
            ParentNode1.Nodes[0].Tag = "";
            ParentNode1.Nodes.Add("WTS2");   
            ParentNode1.Nodes[1].Tag = "";
            ParentNode1.Expand();
            ParentNode2 = treeView2.Nodes.Add("wts");
            ParentNode2.Tag = "";
            ParentNode2.Nodes.Add("wts1");
            ParentNode2.Nodes[0].Tag = "";
            ParentNode2.Nodes.Add("wts2");
            ParentNode2.Nodes[1].Tag = "";
            ParentNode2.Expand();
this.treeView1.ItemDrag += new System.Windows.Forms.ItemDragEventHandler(this.treeView_ItemDrag);
this.treeView2.ItemDrag += new System.Windows.Forms.ItemDragEventHandler(this.treeView_ItemDrag);
this.treeView1.DragEnter += new System.Windows.Forms.DragEventHandler(this.treeView_DragEnter);
this.treeView2.DragEnter += new System.Windows.Forms.DragEventHandler(this.treeView_DragEnter);
this.treeView1.DragDrop += new System.Windows.Forms.DragEventHandler(this.treeView_DragDrop);
this.treeView2.DragDrop += new System.Windows.Forms.DragEventHandler(this.treeView_DragDrop);
        }

就可以了。
   二。动态添加节点及和XML交互。
           这个方法很多，这里就不多介绍，贴出部分代码，请批评指正：

创建根节点#region 创建根节点
private TreeNode CreateNewNode()
{
            TreeNode node = new TreeNode(this.txtTitle.Text.Trim());
            node.Tag = "";
return node;
        }
#endregion
从XML中得到数据#region 从XML中得到数据
private void GetDataFromXML ()
{
//从XML中读取数据到TreeView           
try
{
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load("Menu.xml");

                XmlNodeList xmlNodes = xmlDoc.DocumentElement.ChildNodes;

this.treeView1.BeginUpdate();
this.treeView1.Nodes.Clear();
                XmlNodeToTreeNode(xmlNodes, this.treeView1.Nodes);
this.treeView1.EndUpdate();
            }
catch
{
            }

        }
#endregion
向XML中写数据#region 向XML中写数据
private void InsertDataIntoXML ()
{
//将TreeView保存到XML文件中           
            XmlDocument doc = new XmlDocument();
            doc.LoadXml("<Menu></Menu>");
            XmlNode root = doc.DocumentElement;
            doc.InsertBefore(doc.CreateXmlDeclaration("1.0", "utf-8", "yes"), root);
            TreeNodeToXml(this.treeView1.Nodes, root);
            doc.Save("Menu.xml");
        }
#endregion
TreeNodeToXml#region TreeNodeToXml
private void TreeNodeToXml(TreeNodeCollection treeNodes, XmlNode xmlNode)
{
            XmlDocument doc = xmlNode.OwnerDocument;
foreach (TreeNode treeNode in treeNodes)
{
                XmlNode element = doc.CreateNode("element", "Item", "");
                XmlAttribute attr = doc.CreateAttribute("WTS");
                treeNode.Tag ="";
                attr.Value = treeNode.Text;
                element.Attributes.Append(attr);
                element.AppendChild(doc.CreateCDataSection(treeNode.Tag.ToString()));
                xmlNode.AppendChild(element);

if (treeNode.Nodes.Count > 0)
{
                    TreeNodeToXml(treeNode.Nodes, element);
                }
            }
        }
#endregion
XmlNodeToTreeNode#region XmlNodeToTreeNode
private void XmlNodeToTreeNode(XmlNodeList xmlNode, TreeNodeCollection treeNode)
{
foreach (XmlNode var in xmlNode)
{
if (var.NodeType != XmlNodeType.Element)
{
continue;
                }
                TreeNode newTreeNode = new TreeNode();
                newTreeNode.Text = var.Attributes["WTS"].Value;           
if (var.HasChildNodes)
{
if (var.ChildNodes[0].NodeType == XmlNodeType.CDATA)
{
                        newTreeNode.Tag = var.ChildNodes[0].Value;
                    }

                    XmlNodeToTreeNode(var.ChildNodes, newTreeNode.Nodes);
                }
                treeNode.Add(newTreeNode);
            }
        }
#endregion XmlNodeToTreeNode

当添加了这些函数，接下来就是调用的问题了。

   这些是一些比较笨的方法，并且没有加异常处理另外考虑在也不全面，希望看到的，有好方法的不吝指教！谢谢！