C# 保存和读取TreeView展开的状态
附件
https://files.cnblogs.com/xe2011/ReadAndSaveTreeViewState.rar
保存和读取TreeView展开的状态 节点{ImageIndex,IsExpland,Position,Tag,Text }
//加载
private void buttonLoad_Click(object sender, EventArgs e) { treeView1.Focus(); string xmlFileName = "TreeView.xml"; if (System.IO.File.Exists(xmlFileName)) { WindowsForms.XmlTreeViewState TreeState = new WindowsForms.XmlTreeViewState(); TreeState.LoadTreeViewState(treeView1, xmlFileName); } }
写入
string xmlFileName = "TreeView.xml"; WindowsForms.XmlTreeViewState TreeState = new WindowsForms.XmlTreeViewState(); TreeState.SaveTreeViewState(treeView1, xmlFileName);
XmlTreeViewState.CS
完整的类
using System; using System.Xml; using System.Windows.Forms; using System.Text; //功能 //本代码是在Syed Umar Anis的 //http://www.codeproject.com/Articles/13099/Loading-and-Saving-a-TreeView-control-to-an-XML-fi //这个代码的基础上进行了修改并增加了能恢复TREEVIEW的展开的状态 和选中最后选择的一项 //1 用XML保存和读取TREE VIEW的状态 //2 将一个XML文件加载到TREEVIEW中 namespace WindowsForms { public class XmlTreeViewState { public XmlTreeViewState() { } #region const... private const string XmlNodeTag = "node"; /* * <TreeView> * <node text = "节点1" imageindex = "0" expland = "true" lastselect = "false"> * <node text = "节点2" imageindex = "-1" expland = "true" lastselect = "false"></node> * </node> * </TreeView> */ private const string XmlNodeTextAtt = "text"; private const string XmlNodeTagAtt = "tag"; private const string XmlNodeImageIndexAtt = "imageindex"; private const string XmlNodeExpandState = "expland";//展开状态 private const string XmlNodeIsSelect = "lastselect";//最后选中的项 private const string XmlNodeIndex = "index";//当前TreeView索引 #endregion #region 保存TREEVIEW状态 public void SaveTreeViewState(TreeView treeView, string fileName) { XmlTextWriter textWriter = new XmlTextWriter(fileName, System.Text.Encoding.Unicode); textWriter.WriteStartDocument(); textWriter.WriteStartElement("TreeView"); SaveXmlNodes(treeView.Nodes, textWriter); textWriter.WriteEndElement(); textWriter.Close(); } #endregion #region 读取TreeView状态 public void LoadTreeViewState(TreeView treeView, string fileName) { XmlTextReader reader = null; try { treeView.Nodes.Clear(); // disabling re-drawing of treeview till all nodes are added treeView.BeginUpdate(); reader = new XmlTextReader(fileName); TreeNode parentNode = null; while (reader.Read()) { if (reader.NodeType == XmlNodeType.Element) { if (reader.Name == XmlNodeTag) { TreeNode newNode = new TreeNode(); bool isEmptyElement = reader.IsEmptyElement; // loading node attributes int attributeCount = reader.AttributeCount; if (attributeCount > 0) { for (int i = 0; i < attributeCount; i++) { reader.MoveToAttribute(i); SetAttributeValue(newNode, reader.Name, reader.Value); SetTreeViewState(treeView); } } // add new node to Parent Node or TreeView if (parentNode != null) parentNode.Nodes.Add(newNode); else treeView.Nodes.Add(newNode); // making current node 'ParentNode' if its not empty if (!isEmptyElement) { parentNode = newNode; } } } // moving up to in TreeView if end tag is encountered else if (reader.NodeType == XmlNodeType.EndElement) { if (reader.Name == XmlNodeTag) { parentNode = parentNode.Parent; } } else if (reader.NodeType == XmlNodeType.XmlDeclaration) { //Ignore Xml Declaration } else if (reader.NodeType == XmlNodeType.None) { return; } else if (reader.NodeType == XmlNodeType.Text) { parentNode.Nodes.Add(reader.Value); } } } finally { treeView.EndUpdate(); reader.Close(); } } #endregion #region 设置 展开后的节点 最后选中的节点 private TreeNode LastSelectNode = null;//最后选中的节点 private TreeNode ExpandNode = null;//展开后的节点 // Expland LastSelect private void SetTreeViewState(TreeView treeView) { treeView.SelectedNode = ExpandNode; //Expland if (ExpandNode != null) ExpandNode.Expand(); //Select if (LastSelectNode != null) treeView.SelectedNode = LastSelectNode; } #endregion #region 保存XML节点 private void SaveXmlNodes(TreeNodeCollection nodesCollection, XmlTextWriter textWriter) { for (int i = 0; i < nodesCollection.Count; i++) { TreeNode node = nodesCollection[i]; textWriter.WriteStartElement(XmlNodeTag);// "node"; textWriter.WriteAttributeString(XmlNodeTextAtt, node.Text);// "text"; textWriter.WriteAttributeString(XmlNodeImageIndexAtt, node.ImageIndex.ToString());//"imageindex"; if (node.IsExpanded == true) textWriter.WriteAttributeString(XmlNodeExpandState, node.IsExpanded.ToString());////展开状态 if (node.IsSelected) textWriter.WriteAttributeString(XmlNodeIsSelect, node.IsSelected.ToString());//是否选中 if (node.Tag != null) textWriter.WriteAttributeString(XmlNodeTagAtt, node.Tag.ToString()); textWriter.WriteAttributeString(XmlNodeIndex, node.Index.ToString());//Index // add other node properties to serialize here if (node.Nodes.Count > 0) { SaveXmlNodes(node.Nodes, textWriter); } textWriter.WriteEndElement(); } } #endregion #region 设置XML属性 private void SetAttributeValue(TreeNode node, string propertyName, string value) { if (propertyName == XmlNodeTextAtt) //text { node.Text = value; } else if (propertyName == XmlNodeImageIndexAtt) //ImageIndex { node.ImageIndex = int.Parse(value); } else if (propertyName == XmlNodeExpandState) { ExpandNode = node; } else if (propertyName == XmlNodeIsSelect) { LastSelectNode = node; } else if (propertyName == XmlNodeTagAtt)//tag { node.Tag = value; } else if (propertyName == XmlNodeIndex) { // 用来标识 这样看XML文件时结构清晰 } } #endregion #region 把XML文件读取到TREE中 public void LoadXmlFileInTreeView(TreeView treeView, string fileName) { XmlTextReader reader = null; try { treeView.BeginUpdate(); reader = new XmlTextReader(fileName); TreeNode n = new TreeNode(fileName); treeView.Nodes.Add(n); while (reader.Read()) { if (reader.NodeType == XmlNodeType.Element) { bool isEmptyElement = reader.IsEmptyElement; StringBuilder text = new StringBuilder(); text.Append(reader.Name); int attributeCount = reader.AttributeCount; if (attributeCount > 0) { text.Append(" ( "); for (int i = 0; i < attributeCount; i++) { if (i != 0) text.Append(", "); reader.MoveToAttribute(i); text.Append(reader.Name); text.Append(" = "); text.Append(reader.Value); } text.Append(" ) "); } if (isEmptyElement) { n.Nodes.Add(text.ToString()); } else { n = n.Nodes.Add(text.ToString()); } } else if (reader.NodeType == XmlNodeType.EndElement) { n = n.Parent; } else if (reader.NodeType == XmlNodeType.XmlDeclaration) { } else if (reader.NodeType == XmlNodeType.None) { return; } else if (reader.NodeType == XmlNodeType.Text) { n.Nodes.Add(reader.Value); } } } finally { treeView.EndUpdate(); reader.Close(); } } #endregion } }
