C#对App.config文件或者web.config文件中节点的操作类

//==============================================
//        FileName: ConfigManager
//        Description: 静态方法业务类，用于对C#、ASP.NET中的WinForm & WebForm 项目程序配置文件
//             app.config和web.config的[appSettings]和[connectionStrings]节点进行新增、修改、删除和读取相关的操作。
//==============================================
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using TempusMq;

namespace Kevin.DAL
{
   public enum ConfigurationFile
   {
        AppConfig=1,
        WebConfig=2
   }

    /// <summary>
    /// ConfigManager 应用程序配置文件管理器
    /// </summary>
   public class ConfigManager
   {
       public ConfigManager()
       {
           //
           // TODO: 在此处添加构造函数逻辑
           //
       }


       /// <summary>
       /// 对[appSettings]节点依据Key值读取到Value值，返回字符串
       /// </summary>
       /// <param name="configurationFile">要操作的配置文件名称,枚举常量</param>
       /// <param name="key">要读取的Key值</param>
       /// <returns>返回Value值的字符串</returns>
       public static string ReadValueByKey(ConfigurationFile configurationFile, string key)
       {
           string value = string.Empty;
           string filename = string.Empty;
           if (configurationFile.ToString() == ConfigurationFile.AppConfig.ToString())
           {
               filename = System.Windows.Forms.Application.ExecutablePath + ".config";
           }
           else
           {
               filename = System.AppDomain.CurrentDomain.BaseDirectory + "web.config";
           }

           XmlDocument doc = new XmlDocument();
           doc.Load(filename); //加载配置文件

           XmlNode node = doc.SelectSingleNode("//appSettings");   //得到[appSettings]节点

           ////得到[appSettings]节点中关于Key的子节点
           XmlElement element = (XmlElement)node.SelectSingleNode("//add[@key='" + key + "']");

           if (element != null)
           {
               value = element.GetAttribute("value");
           }

           return value;
       }

       /// <summary>
       /// 对[connectionStrings]节点依据name值读取到connectionString值，返回字符串
       /// </summary>
       /// <param name="configurationFile">要操作的配置文件名称,枚举常量</param>
       /// <param name="name">要读取的name值</param>
       /// <returns>返回connectionString值的字符串</returns>
       public static string ReadConnectionStringByName(ConfigurationFile configurationFile, string name)
       {
           string connectionString = string.Empty;
           string filename = string.Empty;
           if (configurationFile.ToString() == ConfigurationFile.AppConfig.ToString())
           {
               filename = System.Windows.Forms.Application.ExecutablePath + ".config";
           }
           else
           {
               filename = System.AppDomain.CurrentDomain.BaseDirectory + "web.config";
           }

           XmlDocument doc = new XmlDocument();
           doc.Load(filename); //加载配置文件

           XmlNode node = doc.SelectSingleNode("//connectionStrings");   //得到[appSettings]节点

           ////得到[connectionString]节点中关于name的子节点
           XmlElement element = (XmlElement)node.SelectSingleNode("//add[@name='" + name + "']");

           if (element != null)
           {
               connectionString = element.GetAttribute("connectionString");
           }

           return connectionString;
       }

       /// <summary>
       /// 更新或新增[appSettings]节点的子节点值，存在则更新子节点Value,不存在则新增子节点，返回成功与否布尔值
       /// </summary>
       /// <param name="configurationFile">要操作的配置文件名称,枚举常量</param>
       /// <param name="key">子节点Key值</param>
       /// <param name="value">子节点value值</param>
       /// <returns>返回成功与否布尔值</returns>
       public static bool UpdateOrCreateAppSetting(ConfigurationFile configurationFile, string key, string value)
       {
           bool isSuccess = false;
           string filename = string.Empty;
           if (configurationFile.ToString() == ConfigurationFile.AppConfig.ToString())
           {
               filename = System.Windows.Forms.Application.ExecutablePath + ".config";
           }
           else
           {
               filename = System.AppDomain.CurrentDomain.BaseDirectory + "web.config";
           }

           XmlDocument doc = new XmlDocument();
           doc.Load(filename); //加载配置文件

           XmlNode node = doc.SelectSingleNode("//appSettings");   //得到[appSettings]节点

           try
           {
               ////得到[appSettings]节点中关于Key的子节点
               XmlElement element = (XmlElement)node.SelectSingleNode("//add[@key='" + key + "']");

               if (element != null)
               {
                   //存在则更新子节点Value
                   element.SetAttribute("value", value);
               }
               else
               {
                   //不存在则新增子节点
                   XmlElement subElement = doc.CreateElement("add");
                   subElement.SetAttribute("key", key);
                   subElement.SetAttribute("value", value);
                   node.AppendChild(subElement);
               }

               //保存至配置文件(方式一)
               using (XmlTextWriter xmlwriter = new XmlTextWriter(filename, null))
               {
                   xmlwriter.Formatting = Formatting.Indented;
                   doc.WriteTo(xmlwriter);
                   xmlwriter.Flush();
               }

               isSuccess = true;
           }
           catch (Exception e)
           {
               isSuccess = false;
               //输出的调试字符串
               string strOuput = string.Format("更新或新增[appSettings]节点的子节点值失败:{0}\n", e.Message);
               //将信息写入到日志输出文件
               DllComm.TP_WriteAppLogFileEx(DllComm.g_AppLogFileName, strOuput);
               
           }

           return isSuccess;
       }

       /// <summary>
       /// 更新或新增[appSettings]节点的子节点值，存在则更新子节点Value,不存在则新增子节点，返回成功与否布尔值
       /// </summary>
       /// <param name="configurationFile">要操作的配置文件名称,枚举常量</param>
       /// <param name="key">子节点Key值</param>
       /// <param name="value">子节点value值</param>
       /// <returns>返回成功与否布尔值</returns>
       public static bool UpdateOrCreateAppSetting(ConfigurationFile configurationFile,string configFileName,string key, string value)
           {
               bool isSuccess = false;
               string filename = configFileName;

               XmlDocument doc = new XmlDocument();
               doc.Load(filename); //加载配置文件
               XmlNode node = doc.SelectSingleNode("//appSettings");   //得到[appSettings]节点

               try
                {
                    ////得到[appSettings]节点中关于Key的子节点
                    XmlElement element = (XmlElement)node.SelectSingleNode("//add[@key='" + key + "']");

                    if (element != null)
                        {
                        //存在则更新子节点Value
                        element.SetAttribute("value", value);
                        }
                    else
                        {
                        //不存在则新增子节点
                        XmlElement subElement = doc.CreateElement("add");
                        subElement.SetAttribute("key", key);
                        subElement.SetAttribute("value", value);
                        node.AppendChild(subElement);
                        }

                    //保存至配置文件(方式一)
                    using (XmlTextWriter xmlwriter = new XmlTextWriter(filename, null))
                        {
                        xmlwriter.Formatting = Formatting.Indented;
                        doc.WriteTo(xmlwriter);
                        xmlwriter.Flush();
                        }

                    isSuccess = true;
                }
               catch (Exception e)
                {
                isSuccess = false;
                //输出的调试字符串
                string strOuput = string.Format("更新或新增[appSettings]节点的子节点值失败:{0}\n", e.Message);
                //将信息写入到日志输出文件
                DllComm.TP_WriteAppLogFileEx(DllComm.g_AppLogFileName, strOuput);

                }
               return isSuccess;
           }


       /// <summary>
       /// 更新或新增[connectionStrings]节点的子节点值，存在则更新子节点,不存在则新增子节点，返回成功与否布尔值
       /// </summary>
       /// <param name="configurationFile">要操作的配置文件名称,枚举常量</param>
       /// <param name="name">子节点name值</param>
       /// <param name="connectionString">子节点connectionString值</param>
       /// <param name="providerName">子节点providerName值</param>
       /// <returns>返回成功与否布尔值</returns>
       public static bool UpdateOrCreateConnectionString(ConfigurationFile configurationFile, string name, string connectionString, string providerName)
       {
           bool isSuccess = false;
           string filename = string.Empty;
           if (configurationFile.ToString() == ConfigurationFile.AppConfig.ToString())
           {
               filename = System.Windows.Forms.Application.ExecutablePath + ".config";
           }
           else
           {
               filename = System.AppDomain.CurrentDomain.BaseDirectory + "web.config";
           }

           XmlDocument doc = new XmlDocument();
           doc.Load(filename); //加载配置文件

           XmlNode node = doc.SelectSingleNode("//connectionStrings");   //得到[connectionStrings]节点

           try
           {
               ////得到[connectionStrings]节点中关于Name的子节点
               XmlElement element = (XmlElement)node.SelectSingleNode("//add[@name='" + name + "']");

               if (element != null)
               {
                   //存在则更新子节点
                   element.SetAttribute("connectionString", connectionString);
                   element.SetAttribute("providerName", providerName);
               }
               else
               {
                   //不存在则新增子节点
                   XmlElement subElement = doc.CreateElement("add");
                   subElement.SetAttribute("name", name);
                   subElement.SetAttribute("connectionString", connectionString);
                   subElement.SetAttribute("providerName", providerName);
                   node.AppendChild(subElement);
               }

               //保存至配置文件(方式二)
               doc.Save(filename);

               isSuccess = true;
           }
           catch (Exception e)
           {
               isSuccess = false;
               //输出的调试字符串
               string strOuput = string.Format("更新或新增[connectionStrings]节点的子节点值:{0}失败:{1}\n",name,e.Message);
               //将信息写入到日志输出文件
               DllComm.TP_WriteAppLogFileEx(DllComm.g_AppLogFileName, strOuput);
           }

           return isSuccess;
       }

       /// <summary>
       /// 删除[appSettings]节点中包含Key值的子节点，返回成功与否布尔值
       /// </summary>
       /// <param name="configurationFile">要操作的配置文件名称,枚举常量</param>
       /// <param name="key">要删除的子节点Key值</param>
       /// <returns>返回成功与否布尔值</returns>
       public static bool DeleteByKey(ConfigurationFile configurationFile, string key)
       {
           bool isSuccess = false;
           string filename = string.Empty;
           if (configurationFile.ToString() == ConfigurationFile.AppConfig.ToString())
           {
               filename = System.Windows.Forms.Application.ExecutablePath + ".config";
           }
           else
           {
               filename = System.AppDomain.CurrentDomain.BaseDirectory + "web.config";
           }

           XmlDocument doc = new XmlDocument();
           doc.Load(filename); //加载配置文件

           XmlNode node = doc.SelectSingleNode("//appSettings");   //得到[appSettings]节点

           ////得到[appSettings]节点中关于Key的子节点
           XmlElement element = (XmlElement)node.SelectSingleNode("//add[@key='" + key + "']");

           if (element != null)
           {
               //存在则删除子节点
               element.ParentNode.RemoveChild(element);
           }
           else
           {
               //不存在
           }

           try
           {
               //保存至配置文件(方式一)
               using (XmlTextWriter xmlwriter = new XmlTextWriter(filename, null))
               {
                   xmlwriter.Formatting = Formatting.Indented;
                   doc.WriteTo(xmlwriter);
                   xmlwriter.Flush();
               }

               isSuccess = true;
           }
           catch (Exception e)
           {
               //输出的调试字符串
               string strOuput = string.Format("删除[appSettings]节点中包含Key:{0}值的子节点失败:{1}\n",key, e.Message);
               //将信息写入到日志输出文件
               DllComm.TP_WriteAppLogFileEx(DllComm.g_AppLogFileName, strOuput);
           }

           return isSuccess;
       }

       /// <summary>
       /// 删除[connectionStrings]节点中包含name值的子节点，返回成功与否布尔值
       /// </summary>
       /// <param name="configurationFile">要操作的配置文件名称,枚举常量</param>
       /// <param name="name">要删除的子节点name值</param>
       /// <returns>返回成功与否布尔值</returns>
       public static bool DeleteByName(ConfigurationFile configurationFile, string name)
       {
           bool isSuccess = false;
           string filename = string.Empty;
           if (configurationFile.ToString() == ConfigurationFile.AppConfig.ToString())
           {
               filename = System.Windows.Forms.Application.ExecutablePath + ".config";
           }
           else
           {
               filename = System.AppDomain.CurrentDomain.BaseDirectory + "web.config";
           }

           XmlDocument doc = new XmlDocument();
           doc.Load(filename); //加载配置文件

           XmlNode node = doc.SelectSingleNode("//connectionStrings");   //得到[connectionStrings]节点

           ////得到[connectionStrings]节点中关于Name的子节点
           XmlElement element = (XmlElement)node.SelectSingleNode("//add[@name='" + name + "']");

           if (element != null)
           {
               //存在则删除子节点
               node.RemoveChild(element);
           }
           else
           {
               //不存在
           }

           try
           {
               //保存至配置文件(方式二)
               doc.Save(filename);

               isSuccess = true;
           }
           catch (Exception e)
           {
               isSuccess = false;
               //输出的调试字符串
               string strOuput = string.Format("删除[connectionStrings]节点中包含name:{0}值的子节点失败:{1}\n",name,e.Message);
               //将信息写入到日志输出文件
               DllComm.TP_WriteAppLogFileEx(DllComm.g_AppLogFileName, strOuput);
           }

           return isSuccess;
       }
   }

}