C# Web.config 配置文件读取、设置

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using System; using System.Configuration;   namespace ConfigurationTool {     /// <summary>     /// 用于XML操作     /// </summary>     public class ConfigurationHelper     {         //定义一个用于保存静态变量的实例         private static ConfigurationHelper instance = null;         //定义一个保证线程同步的标识         private static readonly object locker = new object();         //构造函数为私有，使外界不能创建该类的实例         private ConfigurationHelper() { }         public static ConfigurationHelper Instance         {             get             {                 if (instance == null)                 {                     lock (locker)                     {                         if (instance == null) instance = new ConfigurationHelper();                     }                 }                 return instance;             }         }           /// <summary>         /// 读取指定路径下Web.config，指定key的value         /// </summary>         /// <param name="filePath">路径</param>         /// <param name="key">key</param>         /// <returns></returns>         public string ReadConfiger(string filePath, string key)         {             ExeConfigurationFileMap map = new ExeConfigurationFileMap();             map.ExeConfigFilename = filePath;             Configuration config = ConfigurationManager.OpenMappedExeConfiguration(map, ConfigurationUserLevel.None);             string value = config.AppSettings.Settings[key].Value;             return value;         }           /// <summary>         /// 保存指定路径下Web.config，指定key的value         /// </summary>         /// <param name="filePath">路径</param>         /// <param name="key">key</param>         /// <param name="value">value</param>         /// <returns></returns>         public string SaveConfiger(string filePath, string key,string value)         {             ExeConfigurationFileMap map = new ExeConfigurationFileMap();             map.ExeConfigFilename = filePath;             Configuration config = ConfigurationManager.OpenMappedExeConfiguration(map, ConfigurationUserLevel.None);             //写入<add>元素的Value             config.AppSettings.Settings[key].Value = value;             //一定要记得保存，写不带参数的config.Save()也可以             config.Save();             //刷新，否则程序读取的还是之前的值（可能已装入内存）             ConfigurationManager.RefreshSection("appSettings");               return value;         }           /// <summary>         /// 根据key获取value         /// </summary>         /// <param name="key">key</param>         /// <returns></returns>         public string GetValueByKey(string key)         {             try             {                 return ConfigurationManager.AppSettings[key];             }             catch (Exception ex)             {                 throw new Exception(ex.Message);             }         }           /// <summary>         /// 设置key对应value         /// </summary>         /// <param name="key">key</param>         /// <param name="value">value</param>         public void SetValueByKey(string key, string value)         {             try             {                 //获取Configuration对象                 Configuration config = System.Configuration.ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);                 //根据Key读取<add>元素的Value                 //string name = config.AppSettings.Settings[key].Value;                 //写入<add>元素的Value                 config.AppSettings.Settings[key].Value = value;                 //增加<add>元素                 //config.AppSettings.Settings.Add("url", "//www.jb51.net");                 //删除<add>元素                 //config.AppSettings.Settings.Remove("name");                 //一定要记得保存，写不带参数的config.Save()也可以                 config.Save();                 //刷新，否则程序读取的还是之前的值（可能已装入内存）                 ConfigurationManager.RefreshSection("appSettings");             }             catch (Exception ex)             {                 throw new Exception(ex.Message);             }         }       } }