http://blog.csdn.net/shuaishifu/article/details/19602059

类库调用自身所带的配置文件中的配置信息，而不是读取应用程序所带的配置信息。代码如下：

private Configuration GetConfig()        {            //获取调用当前正在执行的方法的方法的 Assembly            Assembly assembly = Assembly.GetCallingAssembly();            string path = string.Format("{0}.config", assembly.Location);            if (File.Exists(path) == false)            {                string msg = string.Format("{0}路径下的文件未找到 ", path);                throw new FileNotFoundException(msg);            }            try            {                ExeConfigurationFileMap configFile = new ExeConfigurationFileMap();                configFile.ExeConfigFilename = path;                Configuration config = ConfigurationManager.OpenMappedExeConfiguration(configFile, ConfigurationUserLevel.None);                return config;            }            catch (Exception ex)            {                throw new Exception(ex.Message);            }        }