app.config中的值获取及设置 以及对log4net配置

修改或新增AppSetting节点

/// <summary>
         /// 修改AppSettings中配置
         /// </summary>
         /// <param name="key">key值</param>
         /// <param name="value">相应值</param>
         public static bool SetConfigValue(string key, string value)
         {
             try
             {
                 Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                 if (config.AppSettings.Settings[key] != null)
                     config.AppSettings.Settings[key].Value = value;
                 else
                     config.AppSettings.Settings.Add(key, value);
                 config.Save(ConfigurationSaveMode.Modified);
                 ConfigurationManager.RefreshSection("appSettings");
                 return true;
             }
             catch
             {
                 return false;
             }
         }

/// <summary>
        /// 获取AppSettings中某一节点值
        /// </summary>
        /// <param name="key"></param>
        public static string GetConfigValue(string key)
        {
                Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                if (config.AppSettings.Settings[key] != null)
                     return  config.AppSettings.Settings[key].Value;
                else

                return string.Empty;
        }    

获取AppSetting节点值

　　

对log4Net 设置

<log4net>
    <!--定义输出到文件中-->
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <!--定义文件存放位置-->
      <file value="log\\" />
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <datePattern value="yyyyMMdd'.txt'" />
      <staticLogFileName value="false" />
      <param name="MaxSizeRollBackups" value="100" />
      <layout type="log4net.Layout.PatternLayout">
        <!--每条日志末尾的文字说明-->
        <!--输出格式-->
        <!--样例：2008-03-26 13:42:32,111 [10] INFO  Log4NetDemo.MainClass [(null)] - info-->
        <!--<conversionPattern value="%newline %n记录时间：%date %n线程ID:[%thread] %n日志级别：  %-5level %n出错类：%logger property: [%property{NDC}] - %n错误描述：%message%newline %n"/>-->
        <conversionPattern value="%n记录时间：%date   %n错误描述：%message %n" />
      </layout>
    </appender>
    <root>
      <level value="ALL" />
      <!--文件形式记录日志-->
      <appender-ref ref="RollingLogFileAppender" />
    </root>
  </log4net>

　　

  public static void WriteLog(Type t, Exception ex)
        {
            ILog log = LogManager.GetLogger(t);
            log.Error("Error", ex);
        }

        public static void WriteLog(Type t, string msg)
        {
            ILog log = LogManager.GetLogger(t);
            log.Error(msg);
        }

　　

在写操作日志时，要注意，需要在命名空间上加一句[assembly: XmlConfigurator(Watch = true)]