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

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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

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

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原文地址：http://blog.csdn.net/lxy1106/article/details/42392441