Log4net 自定义字段到数据库

今天要求做个log4net自定义字段到数据库，在网上找了好多例子，都运行不成功。最后找了个国外的，很简单的就解决了。

log4net它已经定义的字段有

 <commandText value="INSERT INTO xiao_log(Date,Thread,Level,Logger,Message)VALUES(@log_date, @thread, @log_level, @logger, @message)"/>

中的Date,Thread,Level,Logger,Message这个5个。
现在自定义2个字段

 <commandText value="INSERT INTO xiao_log(Date,Thread,Level,Logger,Message,UserId,UserName)VALUES(@log_date, @thread, @log_level, @logger, @message,@userid,@username)"/>

自定义字段参数声明和原有参数声明的区别
<--原有字段-->
      <parameter>
        <parameterName value="@log_level"/>
        <dbType value="String"/>
        <size value=""/>
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%level"/>
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@logger"/>
        <dbType value="String"/>
        <size value=""/>
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%logger"/>
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@message"/>
        <dbType value="String"/>
        <size value=""/>
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%message"/>
        </layout>
      </parameter>

      <!--自定义字段-->
      <parameter>
        <parameterName value="@userid"/>
        <dbType value="String" />
        <size value="" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%property{userid}" />
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@username"/>
        <dbType value="String" />
        <size value="" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%property{username}" />
        </layout>
      </parameter>

最后加上这两句话，把参数替换掉就好了

        log4net.GlobalContext.Properties["userid"] = "";
                log4net.GlobalContext.Properties["username"] = "dongsheng";
                Log.Info(ex,"");