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

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>