JavaScriptSerializer 序列化时异常：Operation is not valid due to the current state of the object.

异常详情：

System.InvalidOperationException: Operation is not valid due to the current state of the object.

at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeDictionary(Int32 depth)

at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal(Int32 depth)

at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeDictionary(Int32 depth)

at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal(Int32 depth)

at System.Web.Script.Serialization.JavaScriptObjectDeserializer.BasicDeserialize(String input, Int32 depthLimit, JavaScriptSerializer serializer)

at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize[T](String input)

at EM.GuBaAPI.Web.MonitorLog.Client.Test.Button5_Click(Object sender, EventArgs e)

原因：

进行了Windows Update，安装了几个补丁,以 kb2656356 kb2656351 kb2656353 kb2656358为主会导致以上错误。

解决方案：

配置文件增加节点

<add key="aspnet:MaxJsonDeserializerMembers" value="10000" />

注意不要和http请求搞混淆，设置HTTP请求的最大许可为：<add key="aspnet:MaxHttpCollectionKeys" value="10000" />

详见：微软的官方技术支持：http://support.microsoft.com/kb/2661403/zh-tw