该类适应读写如下格式的.xml,.config文档<?xml version="1.0" encoding="utf-8" standalone="no"?><!--This is a config file ,writer by furenjun--><configuration> <appSettings> <add key="SqlStr0" value="0" /> <add key="SqlStr1" value="1" /> <add key="2006-7-3 16:05:08" value="1" /> </appSettings></configuration>using System;using System.Configuration ;using System.Reflection ;using System.Xml;using System.IO;using System.Collections.Specialized;using System.Collections;using System.Data ;using System.Diagnostics;using System.Windows.Forms;namespace 读写配置文件
{
/// <summary>
/// MrfuRWXmlFile 的摘要说明。
/// </summary> public class MrfuRWXmlFile { public static string ConfigFullName=""; private NameValueCollection appSettings = null; public MrfuRWXmlFile() { // // TODO: 在此处添加构造函数逻辑 // // Assembly MyAssembly= Assembly.GetExecutingAssembly(); // string ConfigLocPath=MyAssembly.Location; // string strDireName=Path.GetDirectoryName(ConfigLocPath) ; // //MessageBox.Show(ConfigLocPath+"\n"+strDireName) ; // ConfigFullName=ConfigLocPath+".config"; ConfigFullName=Application.StartupPath+@"\myProject.config" ; //MessageBox.Show(ConfigFullName) ; } private static void CreateNewXmlFile() { XmlTextWriter myXmlTextWriter = new XmlTextWriter (ConfigFullName, System.Text.Encoding.UTF8 ); myXmlTextWriter.Formatting = Formatting.Indented; myXmlTextWriter.WriteStartDocument(false); //设置standalone="no" //当为（true）时 <?xml version="1.0" standalone="yes" ?> // myXmlTextWriter.WriteDocType("bookstore", null, "books.dtd", null); myXmlTextWriter.WriteComment("This is a config file ,writer by furenjun"); myXmlTextWriter.WriteStartElement("configuration"); myXmlTextWriter.WriteStartElement("appSettings", null);
'写入其它元素' myXmlTextWriter.WriteEndElement(); myXmlTextWriter.WriteEndElement(); //Write the XML to file and close the myXmlTextWriter myXmlTextWriter.Flush(); myXmlTextWriter.Close(); } public MrfuRWXmlFile(string ConfigFilePath) { // // TODO: 在此处添加构造函数逻辑 // ConfigFullName=ConfigFilePath; } public string GsConfigFilePath { get{return ConfigFullName;} set{ConfigFullName=value;} } //初始化xml文档 //首先请右击"项目"-->添加一个新项-->选择"应用程序配置文件"-->点击确定 public static bool CreateXmlFile() { if(!File.Exists(ConfigFullName) ) CreateNewXmlFile(); bool bflag=true; ConfigXmlDocument configXmlDoc=new ConfigXmlDocument();// XmlDocument(); configXmlDoc.Load(ConfigFullName) ; //检查结点是否存在 XmlNode appSettingsNode; appSettingsNode = configXmlDoc.SelectSingleNode("configuration/appSettings"); if(appSettingsNode.LocalName=="appSettings") //或者(appSettingNode!=null) { //如果xml文档中已存在该结点则采用选择定位该结点的方法 appSettingsNode.RemoveAll(); //MessageBox.Show(appSettingsNode.LocalName) ; } else { // Create a new element node. XmlNode newElem; newElem = configXmlDoc.CreateNode(XmlNodeType.Element, "appSettings", ""); //newElem.InnerText = "290"; //"Add the new element to the document
" XmlElement root = configXmlDoc.DocumentElement; root.AppendChild(newElem); //("Display the modified XML document"); //Console.WriteLine(configXmlDoc.OuterXml); appSettingsNode =newElem; } try { for (int i = 0; i < 2; i++) { string key = "SqlStr"+i.ToString() ; string val = i.ToString() ; //创建结点 XmlNode node = configXmlDoc.CreateNode(XmlNodeType.Element, "add", ""); //创建属性"key"并为其赋值 XmlAttribute attr = configXmlDoc.CreateAttribute("key"); attr.Value = key; node.Attributes.Append(attr); //创建属性"value"并为其赋值 attr = configXmlDoc.CreateAttribute("value"); attr.Value = val; node.Attributes.Append(attr); appSettingsNode.AppendChild(node); } configXmlDoc.Save(ConfigFullName); //MessageBox.Show("创建Xml文档结点成功.","系统提示",MessageBoxButtons.OK ,MessageBoxIcon.Information ) ; } catch (Exception ex) { bflag=false; throw new ConfigurationException(ex.ToString() ); } return bflag; } private void LoadFromFile() { //if (appSettings == null) //{ try { //string filePath=@"E:\淄博市鲁中机动车检测中心数据联网软件\FromHlk\读写配置文件\ConfigurationSettingsRW_demo\ConfigurationSettingsRW_demo\ConfigurationSettingsRW.exe.config"; ConfigXmlDocument configXml = new ConfigXmlDocument();// XmlDocument(); //configXml.Load(filePath);//this.configFilePath); configXml.Load(ConfigFullName); //MessageBox.Show(ConfigFullName ) ; XmlNode appSettingsNode = configXml.SelectSingleNode("configuration/appSettings"); //MessageBox.Show(appSettingsNode.LocalName) ; if(appSettingsNode.LocalName=="appSettings") { NameValueSectionHandler handler = new NameValueSectionHandler(); appSettings = new NameValueCollection((NameValueCollection)handler.Create(null, null, appSettingsNode)); } } catch (Exception ex) { throw new ConfigurationException("Error while loading appSettings. Message: " + ex.Message, ex); } //} } /// <summary> /// 获取配置文件中的结点"appSettings"中的值 /// </summary> /// <returns></returns> public DataTable GetSettingsValue() { LoadFromFile(); DataTable tblAppSettings=new DataTable("Settings") ; tblAppSettings.Columns.Add("key", typeof(System.String)); tblAppSettings.Columns.Add("value", typeof(System.String)); for (int i = 0; i < appSettings.Count; i++) { string key = appSettings.GetKey(i); string val = appSettings.Get(i); DataRow row = tblAppSettings.NewRow(); row["key"] = key; row["value"] = val; tblAppSettings.Rows.Add(row); } return tblAppSettings; } /// <summary> /// 添加一条新的纪录 /// </summary> /// <param name="strKey"></param> /// <param name="strValue"></param> /// <returns></returns> public bool AddNewRecorder(string strKey,string strValue) { bool bflag=true; XmlDocument configXmlDoc=new XmlDocument(); configXmlDoc.Load(ConfigFullName) ; XmlNode appSettingsNode; appSettingsNode = configXmlDoc.SelectSingleNode("configuration/appSettings"); if(appSettingsNode==null) { // Create a new element node. XmlNode newElem; newElem = configXmlDoc.CreateNode(XmlNodeType.Element, "appSettings", ""); //newElem.InnerText = "290"; //"Add the new element to the document" XmlElement root = configXmlDoc.DocumentElement; root.AppendChild(newElem); //("Display the modified XML document"); //Console.WriteLine(configXmlDoc.OuterXml); appSettingsNode =newElem; } try { string key = strKey; string val = strValue; //创建结点 XmlNode node = configXmlDoc.CreateNode(XmlNodeType.Element, "add", ""); //创建属性"key"并为其赋值 XmlAttribute attr = configXmlDoc.CreateAttribute("key"); attr.Value = key; node.Attributes.Append(attr); //创建属性"value"并为其赋值 attr = configXmlDoc.CreateAttribute("value"); attr.Value = val; node.Attributes.Append(attr); appSettingsNode.AppendChild(node); configXmlDoc.Save(ConfigFullName); //MessageBox.Show("创建Xml文档结点成功.","系统提示",MessageBoxButtons.OK ,MessageBoxIcon.Information ) ; } catch (Exception ex) { bflag=false; throw new ConfigurationException(ex.ToString() ); } return bflag; } /// <summary> /// Loops through the <code>appSettings</code> NameValueCollection /// and recreates the XML nodes of the <appSettings> config /// section accordingly. It saves the configuration file afterwards. /// </summary> private void SaveToFile() { if (appSettings != null) { try { XmlDocument configXml = new XmlDocument(); configXml.Load(ConfigFullName); XmlNode appSettingsNode = configXml.SelectSingleNode("configuration/appSettings"); appSettingsNode.RemoveAll(); for (int i = 0; i < appSettings.Count; i++) { string key = appSettings.GetKey(i); string val = appSettings.Get(i); XmlNode node = configXml.CreateNode(XmlNodeType.Element, "add", ""); XmlAttribute attr = configXml.CreateAttribute("key"); attr.Value = key; node.Attributes.Append(attr); attr = configXml.CreateAttribute("value"); attr.Value = val; node.Attributes.Append(attr); appSettingsNode.AppendChild(node); } configXml.Save(ConfigFullName); } catch (Exception ex) { throw new ConfigurationException("Error while saving appSettings.", ex); } } } /// <summary> /// 更新一条纪录 /// </summary> /// <param name="strKey"></param> /// <param name="strNewValue"></param> /// <returns></returns> public bool UpdateRecorder(string strKey,string strNewValue) { bool flag=true; try { appSettings[strKey]=strNewValue; SaveToFile(); } catch(System.Exception err) { flag=false; throw new Exception(err.ToString() ) ; } return flag; } /// <summary> /// 读取一个值 /// </summary> /// <param name="strKey"></param> /// <returns></returns> public string ReadSettingsValue(string strKey) { LoadFromFile(); return appSettings[strKey].ToString(); } public bool SaveDataGridChange(DataTable myTable) { bool flag=true; myTable.AcceptChanges(); try { // Recreating the config.AppSettings collection with the data contained in appSettings DataGrid. appSettings.Clear(); foreach (DataRow row in myTable.Rows) { appSettings[row["key"].ToString()] = row["value"].ToString(); } // Saving the appSettings data into the configuration file. SaveToFile(); } catch(System.Exception err) { flag=false; throw new Exception (err.ToString() ); } return flag; } // private void getTableChange(DataTable table) }
}使用: MrfuRWXmlFile mrfurw=new MrfuRWXmlFile(); private void button_Create_Click(object sender, System.EventArgs e) { MrfuRWXmlFile.CreateXmlFile(); this.button_read.PerformClick(); } private void button_read_Click(object sender, System.EventArgs e) { this.dataGrid1.DataSource=mrfurw.GetSettingsValue(); } private void button_Update_Click(object sender, System.EventArgs e) { if(this.textBox_Value.Text.Trim()=="") return; mrfurw.UpdateRecorder("SqlStr0",this.textBox_Value.Text.Trim()); this.button_read.PerformClick(); } int i=0; private void button_Add_Click(object sender, System.EventArgs e) { i+=1; mrfurw.AddNewRecorder( System.DateTime.Now.ToString(),i.ToString()); this.button_read.PerformClick(); } private void button1_Click(object sender, System.EventArgs e) { MessageBox.Show (mrfurw.ReadSettingsValue("SqlStr0" )); } private void button2_Click(object sender, System.EventArgs e) { DataTable myTable=(DataTable)dataGrid1.DataSource; mrfurw.SaveDataGridChange(myTable); }