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<pre name="code" class="csharp">/// <summary>
    /// ¶ÁдϵͳÅäÖÃxmlÎļþ¡£
    /// </summary>
    public class ConfigurationFile
    {
        /// <summary>
        /// дÈëkeyÖµ
        /// </summary>
        public static bool SetKeyValue(string key, string value)
        {
            //Ôö¼ÓµÄÄÚÈÝдÔÚappSettings¶ÎÏ <add key="RegCode" value="0"/>
            Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

            try
            {
                if (config.AppSettings.Settings[key] == null)
                {
                    config.AppSettings.Settings.Add(key, value);
                }
                else
                {
                    config.AppSettings.Settings[key].Value = value;
                }
                config.Save(ConfigurationSaveMode.Modified);
                ConfigurationManager.RefreshSection("appSettings");
            }
            catch (Exception)
            {
                return false;
            }

            return true;
        }

        /// <summary>
        /// ¶ÁÈ¡Ö¸¶¨keyµÄÖµ
        /// </summary>
        public static string GetKeyValue(string key)
        {
            Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            if (config.AppSettings.Settings[key] == null)
                return "";
            else
                return config.AppSettings.Settings[key].Value;
        }
    }