iis 7 asp.net ajax post 請求字節過大報錯問題解決辦法

遇到一個ajax post 提交新聞資訊類的文章，報

{"Message":"There was an error processing the request.","StackTrace":"","ExceptionType":""}
firebug 調試及測試發現是post的字節過長。找了很久，終於找到調整配置的解決方案

 

<appSettings>   

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

<system.web.extensions>
    <scripting>
      <webServices>
        <jsonSerialization maxJsonLength="2147483644"/>
      </webServices>
    </scripting>
  </system.web.extensions>