并非总是如此，但我不断得到以下错误，它并没有对我产生太多影响＆＃34;我认为＆＃34;但我想知道这背后的原因以及我如何解决它。我已尝试disposing上下文，但我没有看到任何改进。下面是我得到的错误日志。
3/16/2017 7:06:55 AM ERROR IN PLM data into file System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at System.Data.SqlServerCe.NativeMethods.CompileQueryPlan(IntPtr pQpCommand, String pwszCommandText, ResultSetOptions options, IntPtr[] pParamNames, IntPtr prgBinding, Int32 cDbBinding, IntPtr& pQpPlan, IntPtr pError)
at System.Data.SqlServerCe.SqlCeCommand.CompileQueryPlan()
at System.Data.SqlServerCe.SqlCeCommand.ExecuteCommand(CommandBehavior behavior, String method, ResultSetOptions options)
at System.Data.Entity.SqlServerCompact.SqlCeMultiCommand.ExecuteReader(CommandBehavior behavior)
at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext,TResult](TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed)
at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(DbCommand command, DbCommandInterceptionContext interceptionContext)
at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)
at System.Data.Entity.Core.Objects.Internal.ObjectQueryExecutionPlan.Execute[TResultType](ObjectContext context, ObjectParameterCollection parameterValues)
at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
at System.Data.Entity.Core.Objects.ObjectQuery`1.<>c__DisplayClass3.<GetResults>b__1()
at System.Data.Entity.Core.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)
at System.Data.Entity.Core.Objects.ObjectQuery`1.<System.Collections.Generic.IEnumerable<T>.GetEnumerator>b__0()
at System.Data.Entity.Internal.LazyEnumerator`1.MoveNext()
at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
at ILS.PLMOptimization.Algorithm.PLMOptimizationAlgorithm.Execute()
代码::
[HandleProcessCorruptedStateExceptions]
public bool Execute()
{
try
{
if (gridpst == true || gridpst == false)
{
//gridpst = false; enable this if you want griddg true or false.
if (ADRFlag == true)
{
MsgBox = "DR EVENT RUNNING! Please wait";
Thread.Sleep(500);
MsgBox = null;
}
else if (ADRFlag == false)
{
// #region startPlm
int calc_plm_data = 0;
DateTime my_date = DateTime.Now; // get the present system time
int rem_min = my_date.Minute % 15; // get the round off system time interms of 15 mintues...
int rem_sec = my_date.Second % 60;
DateTime my_startTime = my_date.AddMinutes(-rem_min);
my_startTime = my_startTime.AddSeconds(-rem_sec);
DateTime my_stopTime = my_date.AddMinutes(5 - rem_min);
my_stopTime = my_stopTime.AddSeconds(-rem_sec);
if (present_plm_data.peakStartTime <= DateTime.MinValue || present_plm_data.peakStopTime >= DateTime.MaxValue)
{
// first time it is entering this loop. Hence check the present datetime and fetch record from the database...
calc_plm_data = 1;
}
else if (DateTime.Now > present_plm_data.present_StopTime || DateTime.Now < present_plm_data.present_StartTime)
{ // present date and time are out of present peak data... so calculate a new peak data from the database
calc_plm_data = 1;
}
if (calc_plm_data == 1)
{
if (DbUpdateLoop.context.Database.Connection.State == System.Data.ConnectionState.Closed)
DbUpdateLoop.context.Database.Connection.Open();
//fetch collection
using (var context = Context.Create("C:\\XSR_BIB_V2\\XSR_BIB_V2_DATABASE.sdf", "", 4091))
{
if (DbUpdateLoop.context.Database.Connection.State == System.Data.ConnectionState.Closed)
DbUpdateLoop.context.Database.Connection.Open();
try
{
var data = DbUpdateLoop.context.EnergyPeakInfo_Tbl.Where(x => (my_startTime >= x.StartTime) && (my_stopTime <= x.StopTime)).FirstOrDefault();
if (data == null)
{
MsgBox = "No data available in DB";
Thread.Sleep(500);
MsgBox = null;
// data is not retrieved from the database, either the data is not present or database access return error
// in this case, we need to get the data from the
return true;
}
// get the peak data from the energyinfo...
present_plm_data.present_StartTime = my_startTime;
present_plm_data.present_StopTime = my_stopTime;
present_plm_data.peakStartTime = data.StartTime;
present_plm_data.peakStopTime = data.StopTime;
present_plm_data.peakType = data.PeakType;
present_plm_data.price = data.PricePerKW;
present_plm_data.threshHold = data.PlmThreshold;
//calculate the threshold value from the data available in database.
var startTS = new TimeSpan(my_startTime.Hour, my_startTime.Minute, my_startTime.Second);
var endTS = new TimeSpan(my_stopTime.Hour, my_stopTime.Minute, my_stopTime.Second);
if (noOfDaysToConsider == null)
noOfDaysToConsider = 0;
noOfDaysToConsider = 1;
DateTime DaysToConsider = DateTime.Now.AddDays((-1) * noOfDaysToConsider).Date;
if (noOfDaysToConsider > 0)
{
try
{
MsgBox = "Schedule Number of days is greater than 0";
Thread.Sleep(500);
MsgBox = null;
//it shld be greater than or equal to
if (DbUpdateLoop.context.Database.Connection.State == System.Data.ConnectionState.Closed)
DbUpdateLoop.context.Database.Connection.Open();
var allEntries = DbUpdateLoop.context.EnergyMeter_GridTbl.Where(x => x.Timestamp > DaysToConsider).ToArray();
var entries = allEntries.Where(x => x.Timestamp.TimeOfDay >= startTS && x.Timestamp.TimeOfDay < endTS).ToArray();
try
{
double avgKW = 0.2;//entries.Average(x => x.KW); //set as default uncoment when required.
present_plm_data.threshHold = Math.Round(avgKW, 5);
AVGTHRESHOLD = present_plm_data.threshHold;
}
catch (Exception ex)
{
// if no data is there in the data base, then make a default as per the xml file...
MsgBox = "Schedule Threshold no data is there in the data base, then make a default as per the xml file";
Thread.Sleep(500);
MsgBox = null;
present_plm_data.threshHold = data.PlmThreshold;
AVGTHRESHOLD = present_plm_data.threshHold;
using (System.IO.StreamWriter file =
new System.IO.StreamWriter(@"C:\XSR_BIB_V2\LOGFILE.txt", true))
{
// file.WriteLine(DateTime.Now + "Schedule Threshold no data is there in the data base, then make a default as per the xml file " + ex);
}
}
}
catch (AccessViolationException aV)
{ // if no data is there in the data base, then make a default as per the xml file...
MsgBox = "Schedule Threshold no data is there in the data base, then make a default as per the xml file";
Thread.Sleep(500);
MsgBox = null;
present_plm_data.threshHold = data.PlmThreshold;
AVGTHRESHOLD = present_plm_data.threshHold;
using (System.IO.StreamWriter file =
new System.IO.StreamWriter(@"C:\XSR_BIB_V2\LOGFILE.txt", true))
{
file.WriteLine(DateTime.Now + " ERROR IN PLM data into file " + aV);
}
}
catch (Exception ee)
{
}
}
}
catch (AccessViolationException aV)
{
using (System.IO.StreamWriter file =
new System.IO.StreamWriter(@"C:\XSR_BIB_V2\LOGFILE.txt", true))
{
file.WriteLine(DateTime.Now + " ERROR IN PLM data into file " + aV);
}
}
catch (Exception ee)
{
}
}
}
if (present_plm_data.peakType == 0) //Peak type = High
{
//broadcast_Low = true;
//broadcast_Medium = true;
MsgBox = "Schedule TYPE 0 High Peak";
Thread.Sleep(500);
MsgBox = null;
firsttime_MidPeak = 0;
firsttime_OffPeak = 0;
AlgorithmForHighPeak(present_plm_data);
Thread.Sleep(3000);
Thread.Sleep(5000);
}
else if (present_plm_data.peakType == 1) //Peak type = Medium
{
//broadcast_Low = true;
//broadcast_High = true;
MsgBox = "Schedule TYPE 1 Medium Peak";
Thread.Sleep(500);
MsgBox = null;
firsttime_OnPeak = 0;
firsttime_OffPeak = 0;
AlgorithmForMediumPeak(present_plm_data);
Thread.Sleep(3000);
Thread.Sleep(5000);
}
else if (present_plm_data.peakType == 2) //Peak type = Low
{
MsgBox = "Schedule TYPE 2 Low Peak";
Thread.Sleep(500);
MsgBox = null;
firsttime_OnPeak = 0;
firsttime_MidPeak = 0;
AlgorithmForLowPeak(present_plm_data);
Thread.Sleep(3000);
Thread.Sleep(5000);
}
// }));
}
}
else if (gridpst == false)
{
//switch to battery and break until grid is on
MsgBox = "Schedule not running..";
Thread.Sleep(500);
MsgBox = null;
}
}
catch (Exception ex)
{
MsgBox = " Schedule not running.due to unknown exception,please wait..";
Thread.Sleep(500);
MsgBox = null;
}
return true;
}
答案 0 :(得分：1)
此问题已经被很好地诊断出来，最好的办法就是阅读谷歌点击“CompileQueryPlan AccessViolationException”。 This blog post和this existing SO question是最可靠的核心匹配。总而言之，之前确定了三个基本原因：
.NET提供程序与实现SqlCompact的本机DLL不匹配。避免此失败模式的最佳方法是使用Nuget package，因此您拥有自己的这些DLL的私有副本，并且可以确定不存在DLL Hell问题。
在多个线程上运行SQL查询。任何SQL相关代码的情况都有可能发生。 SqlCompact不是线程安全的，需要锁定。
未设置Connection属性。这是SO问题中公认的答案。看起来不太可能是远距离的原因，用户的代码肯定是通过使用异步计时器跳到原因2。
答案 1 :(得分：1)
在.NET 4.0中，运行时将作为Windows结构化错误处理（SEH）错误引发的某些异常处理为损坏状态的指示符。您的标准托管代码不允许捕获这些损坏的状态异常（CSE）。我不知道为什么会这样或者如何进入。阅读本文关于.NET 4.0 Framework中的CSE：
http://msdn.microsoft.com/en-us/magazine/dd419661.aspx#id0070035
但是有希望。有几种方法可以解决这个问题：
重新编译为.NET 3.5程序集并在.NET 4.0中运行。
Add a line to your application's config file under the configuration/runtime element:
<legacyCorruptedStateExceptionsPolicy> enabled="true|false"/>
Decorate the methods you want to catch these exceptions in with the HandleProcessCorruptedStateExceptions attribute.http://msdn.microsoft.com/en-us/magazine/dd419661.aspx#id0070035 的信息。