C#读写config配置文件的方法

如下所示：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
 <add key="ServerIP" value="127.0.0.1"></add>
 <add key="DataBase" value="WarehouseDB"></add>
 <add key="user" value="sa"></add>
 <add key="password" value="sa"></add>
</appSettings>
</configuration>

对config配置文件的读写类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Configuration;
using System.ServiceModel;
using System.ServiceModel.Configuration;

namespace NetUtilityLib
{
 public static class ConfigHelper
 {
   //依据连接串名字connectionName返回数据连接字符串
   public static string GetConnectionStringsConfig(string connectionName)
   {
     //指定config文件读取
     string file = System.Windows.Forms.Application.ExecutablePath;
     System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(file);
     string connectionString =
       config.ConnectionStrings.ConnectionStrings[connectionName].ConnectionString.ToString();
     return connectionString;
   }

///<summary>
   ///更新连接字符串
   ///</summary>
   ///<param name="newName">连接字符串名称</param>
   ///<param name="newConString">连接字符串内容</param>
   ///<param name="newProviderName">数据提供程序名称</param>
   public static void UpdateConnectionStringsConfig(string newName, string newConString, string newProviderName)
   {
     //指定config文件读取
     string file = System.Windows.Forms.Application.ExecutablePath;
     Configuration config = ConfigurationManager.OpenExeConfiguration(file);

bool exist = false; //记录该连接串是否已经存在
     //如果要更改的连接串已经存在
     if (config.ConnectionStrings.ConnectionStrings[newName] != null)
     {
       exist = true;
     }
     // 如果连接串已存在，首先删除它
     if (exist)
     {
       config.ConnectionStrings.ConnectionStrings.Remove(newName);
     }
     //新建一个连接字符串实例
     ConnectionStringSettings mySettings =
       new ConnectionStringSettings(newName, newConString, newProviderName);
     // 将新的连接串添加到配置文件中.
     config.ConnectionStrings.ConnectionStrings.Add(mySettings);
     // 保存对配置文件所作的更改
     config.Save(ConfigurationSaveMode.Modified);
     // 强制重新载入配置文件的ConnectionStrings配置节
     ConfigurationManager.RefreshSection("ConnectionStrings");
   }

///<summary>
   ///返回*.exe.config文件中appSettings配置节的value项
   ///</summary>
   ///<param name="strKey"></param>
   ///<returns></returns>
   public static string GetAppConfig(string strKey)
   {
     string file = System.Windows.Forms.Application.ExecutablePath;
     Configuration config = ConfigurationManager.OpenExeConfiguration(file);
     foreach (string key in config.AppSettings.Settings.AllKeys)
     {
       if (key == strKey)
       {
         return config.AppSettings.Settings[strKey].Value.ToString();
       }
     }
     return null;
   }

///<summary>
   ///在*.exe.config文件中appSettings配置节增加一对键值对
   ///</summary>
   ///<param name="newKey"></param>
   ///<param name="newValue"></param>
   public static void UpdateAppConfig(string newKey, string newValue)
   {
     string file = System.Windows.Forms.Application.ExecutablePath;
     Configuration config = ConfigurationManager.OpenExeConfiguration(file);
     bool exist = false;
     foreach (string key in config.AppSettings.Settings.AllKeys)
     {
       if (key == newKey)
       {
         exist = true;
       }
     }
     if (exist)
     {
       config.AppSettings.Settings.Remove(newKey);
     }
     config.AppSettings.Settings.Add(newKey, newValue);
     config.Save(ConfigurationSaveMode.Modified);
     ConfigurationManager.RefreshSection("appSettings");
   }

// 修改system.serviceModel下所有服务终结点的IP地址
   public static void UpdateServiceModelConfig(string configPath, string serverIP)
   {
     Configuration config = ConfigurationManager.OpenExeConfiguration(configPath);
     ConfigurationSectionGroup sec = config.SectionGroups["system.serviceModel"];
     ServiceModelSectionGroup serviceModelSectionGroup = sec as ServiceModelSectionGroup;
     ClientSection clientSection = serviceModelSectionGroup.Client;
     foreach (ChannelEndpointElement item in clientSection.Endpoints)
     {
       string pattern = @"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b";
       string address = item.Address.ToString();
       string replacement = string.Format("{0}", serverIP);
       address = Regex.Replace(address, pattern, replacement);
       item.Address = new Uri(address);
     }

config.Save(ConfigurationSaveMode.Modified);
     ConfigurationManager.RefreshSection("system.serviceModel");
   }

// 修改applicationSettings中App.Properties.Settings中服务的IP地址
   public static void UpdateConfig(string configPath, string serverIP)
   {
     Configuration config = ConfigurationManager.OpenExeConfiguration(configPath);
     ConfigurationSectionGroup sec = config.SectionGroups["applicationSettings"];
     ConfigurationSection configSection = sec.Sections["DataService.Properties.Settings"];
     ClientSettingsSection clientSettingsSection = configSection as ClientSettingsSection;
     if (clientSettingsSection != null)
     {
       SettingElement element1 = clientSettingsSection.Settings.Get("DataService_SystemManagerWS_SystemManagerWS");
       if (element1 != null)
       {
         clientSettingsSection.Settings.Remove(element1);
         string oldValue = element1.Value.ValueXml.InnerXml;
         element1.Value.ValueXml.InnerXml = GetNewIP(oldValue, serverIP);
         clientSettingsSection.Settings.Add(element1);
       }

SettingElement element2 = clientSettingsSection.Settings.Get("DataService_EquipManagerWS_EquipManagerWS");
       if (element2 != null)
       {
         clientSettingsSection.Settings.Remove(element2);
         string oldValue = element2.Value.ValueXml.InnerXml;
         element2.Value.ValueXml.InnerXml = GetNewIP(oldValue, serverIP);
         clientSettingsSection.Settings.Add(element2);
       }
     }
     config.Save(ConfigurationSaveMode.Modified);
     ConfigurationManager.RefreshSection("applicationSettings");
   }

private static string GetNewIP(string oldValue, string serverIP)
   {
     string pattern = @"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b";
     string replacement = string.Format("{0}", serverIP);
     string newvalue = Regex.Replace(oldValue, pattern, replacement);
     return newvalue;
   }
 }
}

测试代码如下：

class Program
 {
   static void Main(string[] args)
   {
     try
     {
       //string file = System.Windows.Forms.Application.ExecutablePath + ".config";
       //string file1 = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;
       string serverIP = ConfigHelper.GetAppConfig("ServerIP");
       string db = ConfigHelper.GetAppConfig("DataBase");
       string user = ConfigHelper.GetAppConfig("user");
       string password = ConfigHelper.GetAppConfig("password");

Console.WriteLine(serverIP);
       Console.WriteLine(db);
       Console.WriteLine(user);
       Console.WriteLine(password);

ConfigHelper.UpdateAppConfig("ServerIP", "192.168.1.11");
       string newIP = ConfigHelper.GetAppConfig("ServerIP");
       Console.WriteLine(newIP);

Console.ReadKey();
     }
     catch (Exception ex)
     {
       Console.WriteLine(ex.Message);
     }
   }
 }