操作APP.CONFIG文件

 此段代码只能操作c#的config文件

首先得添加引用

using System.Configuration;

/// <summary>
    /// 操作config文件
    /// </summary>
    public class Config
    {
        // Methods
        /// <summary>
        /// 根据键值取得Config文件里的AppSetting里的数据
        /// </summary>
        /// <param name="appKey">键值</param>
        /// <returns>应用程序信息</returns>
        public static string getConfigForAppSettings(string appKey)
        {
            return ConfigurationManager.AppSettings[appKey].ToString();
        }
        /// <summary>
        /// 根据键值取得Config文件里的ConnectionStrings里的数据
        /// </summary>
        /// <param name="appKey">键值</param>
        /// <returns>连接字符串</returns>
        public static string getConfigForConnectionStrings(string appKey)
        {
            return ConfigurationManager.ConnectionStrings[appKey].ConnectionString;
        }
        /// <summary>
        /// 根据键值设置Config文件里的AppSetting里的数据
        /// </summary>
        /// <param name="appKey">键值</param>
        /// <param name="appKeyValue">应用程序信息</param>
        public static void setConfigForAppSettings(string appKey, string appKeyValue)
        {
            bool flag = false;
            foreach (string str in ConfigurationManager.AppSettings)
            {
                if (string.Compare(str, appKey) == 0)
                {
                    flag = true;
                }
            }
            System.Configuration.Configuration configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            if (flag)
            {
                configuration.AppSettings.Settings.Remove(appKey);
            }
            configuration.AppSettings.Settings.Add(appKey, appKeyValue);
            configuration.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("appSettings");
        }
        /// <summary>
        /// 根据键值设置Config文件里的ConnectionString里的数据
        /// </summary>
        /// <param name="appKey">键值</param>
        /// <param name="appKeyValue">连接字符串</param>
        public static void setConfigForConnectionStrings(string appKey, string appKeyValue)
        {
            bool flag = false;
            for (int i = 0; i < ConfigurationManager.ConnectionStrings.Count; i++)
            {
                if (string.Compare(appKey, ConfigurationManager.ConnectionStrings[i].Name) == 0)
                {
                    flag = true;
                }
            }
            System.Configuration.Configuration configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            if (flag)
            {
                configuration.ConnectionStrings.ConnectionStrings.Remove(appKey);
            }
            ConnectionStringSettings settings = new ConnectionStringSettings(appKey, appKeyValue);
            configuration.ConnectionStrings.ConnectionStrings.Add(settings);
            configuration.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("connectionStrings");
        }

    }