iis 7 asp.net ajax post 请求字节过大报错问题解决办法

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遇到一个ajax post 提交新闻资讯类的文章，报

{"Message":"There was an error processing the request.","StackTrace":"","ExceptionType":""}
firebug 调试及测试发现是post的字节过长。找了好久，终于找到调整配置的解决方案           

<appSettings>   

<add key="aspnet:MaxJsonDeserializerMembers" value="150000" />

  </appSettings>

<system.web.extensions>

    <scripting>

      <webServices>

        <jsonSerialization maxJsonLength="2147483644"/>

      </webServices>

    </scripting>

  </system.web.extensions>