c# System.AccessViolationException：試圖讀取或寫入受保護的內存。？

Question

並非總是如此，但有時我會不斷收到以下錯誤，“我認為”對我沒有太大影響，但我想知道這背后的原因以及如何解決它。 我曾嘗試disposing上下文，但沒有看到任何改進。 下面是我得到的錯誤日志。

      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()

代碼在這里：：

 [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;
        }

Answer 1

在 .NET 4.0 中，運行時處理作為 Windows 結構化錯誤處理 (SEH) 錯誤引發的某些異常，作為損壞狀態的指標。 您的標准托管代碼不允許捕獲這些損壞狀態異常 (CSE)。 我不會討論這里的原因或方式。 閱讀有關 .NET 4.0 框架中 CSE 的這篇文章：

http://msdn.microsoft.com/en-us/magazine/dd419661.aspx#id0070035

但有希望。 有幾種方法可以解決這個問題：

重新編譯為 .NET 3.5 程序集並在 .NET 4.0 中運行它。

 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 available under `System.Runtime.ExceptionServices` namespace.

http://msdn.microsoft.com/en-us/magazine/dd419661.aspx#id0070035了解詳情。

更多參考： http : //connect.microsoft.com/VisualStudio/feedback/details/557105/unable-to-catch-accessviolationexception

Answer 2

這個問題之前已經被很好地診斷出來，最好的辦法是閱讀你為“CompileQueryPlan AccessViolationException”獲得的谷歌點擊量。 這篇博文和這個現有的 SO 問題是看起來最可靠的核心命中。 總之，之前確定了三個基本原因：

1. .NET 提供程序與實現 SqlCompact 的本機 DLL 之間存在不匹配。 避免這種故障模式的最佳方法是使用Nuget 包，這樣您就擁有這些 DLL 的私有副本，並且可以確保不會出現 DLL Hell 問題。

2. 在多個線程上運行 SQL 查詢。 任何 SQL 相關代碼都有可能出現的情況。 SqlCompact 不是線程安全的，需要鎖。

3. 沒有設置 Connection 屬性。 這是 SO 問題中公認的答案。 從遠處看似乎不太可能是原因，用戶的代碼通過使用異步計時器肯定會圍繞原因 2 跳舞。