C#动态操作Config文件Web.Winform通用

sing System.Configuration;
 
 
namespace Zwj.TEMS.Common
{
    public abstract class ConfigHelper
    {
        private ConfigHelper()
        { }
 
        /// <summary>
        /// 获取配置值
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string GetAppSettingValue(string key)
        {
            return ConfigurationManager.AppSettings[key];
        }
 
        /// <summary>
        /// 设置配置值（存在则更新，不存在则新增）
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void SetAppSettingValue(string key, string value)
        {
            var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            var setting = config.AppSettings.Settings[key];
            if (setting==null)
            {
                config.AppSettings.Settings.Add(key, value);
            }
            else
            {
                setting.Value = value;
            }
 
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("appSettings");
        }
 
        /// <summary>
        /// 删除配置值
        /// </summary>
        /// <param name="key"></param>
        public static void RemoveAppSetting(string key)
        {
            var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            config.AppSettings.Settings.Remove(key);
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("appSettings");
        }
 
 
        /// <summary>
        /// 获取连接字符串
        /// </summary>
        /// <param name="name"></param>
        /// <returns></returns>
        public static string GetConnectionString(string name)
        {
          return  ConfigurationManager.ConnectionStrings[name].ConnectionString;
        }
 
        /// <summary>
        /// 设置连接字符串的值（存在则更新，不存在则新增）
        /// </summary>
        /// <param name="name"></param>
        /// <param name="connstr"></param>
        /// <param name="provider"></param>
        public static void SetConnectionString(string name,string connstr, string provider)
        {
            var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            ConnectionStringSettings connStrSettings = config.ConnectionStrings.ConnectionStrings[name];
            if (connStrSettings != null)
            {
                connStrSettings.ConnectionString = connstr;
                connStrSettings.ProviderName = provider;
            }
            else
            {
                connStrSettings = new ConnectionStringSettings(name, connstr, provider);
                config.ConnectionStrings.ConnectionStrings.Add(connStrSettings);
            }
 
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("connectionStrings");
        }
 
        /// <summary>
        /// 删除连接字符串配置项
        /// </summary>
        /// <param name="name"></param>
        public static void RemoveConnectionString(string name)
        {
            var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            config.ConnectionStrings.ConnectionStrings.Remove(name);
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("connectionStrings");
        }
 
    }
}