在网上找了找，没有找到解决办法，最后发现是程序中使用了ViewState，向其中保存了空值。代码如下，如果没有注释中与逻辑条件，就会报错。应该容易理解，你破坏了ViewState的存储结构，所以报错。它在页面加载的时候不知道如何读取数据了。
if (tbAnswerA.Visible == true)//说明输入了 && tbAnswerA.Text!=""
{
userHuiDa[jiBie, tiBie] = tbAnswerA.Text;
litUserHuiDa.Text = answerStr + tbAnswerA.Text;
ViewState["userHuiDa" + tiBie.ToString()] = userHuiDa;
}
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。
异常详细信息: System.Web.HttpException: 此页的状态信息无效，可能已损坏。
源错误:
[没有相关的源行]
源文件: f:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\htdocs\93aefb87\b9d27afd\App_Web_4yxryetq.0.cs 行: 0
堆栈跟踪:
[EndOfStreamException: 无法在流的结尾之外进行读取。] System.IO.__Error.EndOfFile() +56 System.IO.BinaryReader.ReadByte() +7674287 System.Web.UI.ObjectStateFormatter.DeserializeValue(SerializerBinaryReader reader) +41 System.Web.UI.ObjectStateFormatter.DeserializeValue(SerializerBinaryReader reader) +404 System.Web.UI.ObjectStateFormatter.Deserialize(Stream inputStream) +135[ArgumentException: 序列化的数据无效。] System.Web.UI.ObjectStateFormatter.Deserialize(Stream inputStream) +199 System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +297 System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Deserialize(String serializedState) +4 System.Web.UI.Util.DeserializeWithAssert(IStateFormatter formatter, String serializedState) +37 System.Web.UI.HiddenFieldPageStatePersister.Load() +113[ViewStateException: 无效的视图状态。 Client IP: 127.0.0.1 Port: User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729) ViewState: 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...][HttpException (0x80004005): 此页的状态信息无效，可能已损坏。] System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +106 System.Web.UI.ViewStateException.ThrowViewStateError(Exception inner, String persistedState) +14 System.Web.UI.HiddenFieldPageStatePersister.Load() +217 System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +105 System.Web.UI.Page.LoadAllState() +43 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6785 System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +242 System.Web.UI.Page.ProcessRequest() +80 System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21 System.Web.UI.Page.ProcessRequest(HttpContext context) +49 ASP.education_graduate_course_tools_zhi_shang_xun_lian_aspx.ProcessRequest(HttpContext context) in f:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\htdocs\93aefb87\b9d27afd\App_Web_4yxryetq.0.cs:0 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +181 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75
“/htdocs”应用程序中的服务器错误。
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此页的状态信息无效，可能已损坏。
版本信息: Microsoft .NET Framework 版本:2.0.50727.3620; ASP.NET 版本:2.0.50727.3618
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