using System;using System.Configuration;using System.Web;using System.Web.Configuration;namespace Whir.ezEIP{    /// <summary>    /// WebConfig读写辅助类    /// </summary>    public class WebConfigManager : IDisposable    {        private Configuration _config;        /// <summary>        /// WebConfig读写辅助类        /// </summary>        public WebConfigManager()            : this(HttpContext.Current.Request.ApplicationPath)        {        }        /// <summary>        /// WebConfig读写辅助类        /// </summary>        /// <param name="path"></param>        public WebConfigManager(string path)        {            _config = WebConfigurationManager.OpenWebConfiguration(path);        }        #region IDisposable Members        public void Dispose()        {            if (_config != null)            {                _config.Save();            }        }        #endregion        /// <summary>         /// 设置应用程序配置节点，如果已经存在此节点，则会修改该节点的值，否则添加此节点        /// </summary>         /// <param name="key">节点名称</param>         /// <param name="value">节点值</param>         public void SetAppSetting(string key, string value)        {            var appSetting = (AppSettingsSection)_config.GetSection("appSettings");            if (appSetting.Settings[key] == null) //如果不存在此节点，则添加             {                appSetting.Settings.Add(key, value);            }            else //如果存在此节点，则修改             {                appSetting.Settings[key].Value = http://www.mamicode.com/value;"key">节点名称</param>        /// <param name="connectionString"> </param>        public void SetConnectionString(string key, string connectionString)        {            var connectionSetting = (ConnectionStringsSection)_config.GetSection("connectionStrings");            if (connectionSetting.ConnectionStrings[key] == null) //如果不存在此节点，则添加             {                var connectionStringSettings = new ConnectionStringSettings(key, connectionString);                connectionSetting.ConnectionStrings.Add(connectionStringSettings);            }            else //如果存在此节点，则修改             {                connectionSetting.ConnectionStrings[key].ConnectionString = connectionString;            }            Save();        }        /// <summary>         /// 保存所作的修改         /// </summary>         public void Save()        {            _config.Save();            _config = null;        }    }}

使用方法：

   var config = new WebConfigManager();   config.SetAppSetting("StrRegex", "");

读取AppSetting和ConnectionString：

string fileType=ConfigurationManager.AppSettings["FileType "];

string connectionString = ConfigurationManager.ConnectionStrings["AspNetStudyConnectionString1"].ConnectionString;

ASP.NET Web.Config 读写辅助类