source: branches/eraser6/BlackBox/Eraser.Util/BlackBox.cs @ 1456

Revision 1456, 22.4 KB checked in by lowjoel, 5 years ago (diff)

Added a Timestamp field to the BlackBoxReport? class to access the timestamp of the report (currently, it's just parsing the filename of the report.)

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1/*
2 * $Id$
3 * Copyright 2008-2009 The Eraser Project
4 * Original Author: Joel Low <lowjoel@users.sourceforge.net>
5 * Modified By:
6 *
7 * This file is part of Eraser.
8 *
9 * Eraser is free software: you can redistribute it and/or modify it under the
10 * terms of the GNU General Public License as published by the Free Software
11 * Foundation, either version 3 of the License, or (at your option) any later
12 * version.
13 *
14 * Eraser is distributed in the hope that it will be useful, but WITHOUT ANY
15 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
16 * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
17 *
18 * A copy of the GNU General Public License can be found at
19 * <http://www.gnu.org/licenses/>.
20 */
21
22using System;
23using System.Collections.Generic;
24using System.Text;
25using System.Windows.Forms;
26using System.IO;
27using System.Runtime.InteropServices;
28using Microsoft.Win32.SafeHandles;
29using System.Diagnostics;
30using System.Threading;
31using System.Drawing;
32using System.Drawing.Imaging;
33using System.Reflection;
34using System.Collections.ObjectModel;
35using System.Globalization;
36
37namespace Eraser.Util
38{
39    /// <summary>
40    /// Handles application exceptions, stores minidumps and uploads them to the
41    /// Eraser server.
42    /// </summary>
43    public class BlackBox
44    {
45        /// <summary>
46        /// Stores DLL references for this class.
47        /// </summary>
48        private static class NativeMethods
49        {
50            /// <summary>
51            /// Writes user-mode minidump information to the specified file.
52            /// </summary>
53            /// <param name="hProcess">A handle to the process for which the information
54            /// is to be generated.</param>
55            /// <param name="ProcessId">The identifier of the process for which the information
56            /// is to be generated.</param>
57            /// <param name="hFile">A handle to the file in which the information is to be
58            /// written.</param>
59            /// <param name="DumpType">The type of information to be generated. This parameter
60            /// can be one or more of the values from the MINIDUMP_TYPE enumeration.</param>
61            /// <param name="ExceptionParam">A pointer to a MiniDumpExceptionInfo structure
62            /// describing the client exception that caused the minidump to be generated.
63            /// If the value of this parameter is NULL, no exception information is included
64            /// in the minidump file.</param>
65            /// <param name="UserStreamParam">Not supported. Use IntPtr.Zero</param>
66            /// <param name="CallbackParam">Not supported. Use IntPtr.Zero</param>
67            /// <returns>If the function succeeds, the return value is true; otherwise, the
68            /// return value is false. To retrieve extended error information, call GetLastError.
69            /// Note that the last error will be an HRESULT value.</returns>
70            [DllImport("dbghelp.dll", SetLastError = true)]
71            [return: MarshalAs(UnmanagedType.Bool)]
72            public static extern bool MiniDumpWriteDump(IntPtr hProcess, uint ProcessId,
73                SafeFileHandle hFile, MiniDumpType DumpType,
74                ref MiniDumpExceptionInfo ExceptionParam, IntPtr UserStreamParam,
75                IntPtr CallbackParam);
76
77            /// <summary>
78            /// Identifies the type of information that will be written to the minidump file
79            /// by the MiniDumpWriteDump function.
80            /// </summary>
81            public enum MiniDumpType
82            {
83                /// <summary>
84                /// Include just the information necessary to capture stack traces for all
85                /// existing threads in a process.
86                /// </summary>
87                MiniDumpNormal = 0x00000000,
88
89                /// <summary>
90                /// Include the data sections from all loaded modules. This results in the
91                /// inclusion of global variables, which can make the minidump file significantly
92                /// larger. For per-module control, use the ModuleWriteDataSeg enumeration
93                /// value from MODULE_WRITE_FLAGS.
94                /// </summary>
95                MiniDumpWithDataSegs = 0x00000001,
96
97                /// <summary>
98                /// Include all accessible memory in the process. The raw memory data is
99                /// included at the end, so that the initial structures can be mapped directly
100                /// without the raw memory information. This option can result in a very large
101                /// file.
102                /// </summary>
103                MiniDumpWithFullMemory = 0x00000002,
104
105                /// <summary>
106                /// Include high-level information about the operating system handles that are
107                /// active when the minidump is made.
108                /// </summary>
109                MiniDumpWithHandleData = 0x00000004,
110
111                /// <summary>
112                /// Stack and backing store memory written to the minidump file should be
113                /// filtered to remove all but the pointer values necessary to reconstruct a
114                /// stack trace. Typically, this removes any private information.
115                /// </summary>
116                MiniDumpFilterMemory = 0x00000008,
117
118                /// <summary>
119                /// Stack and backing store memory should be scanned for pointer references
120                /// to modules in the module list. If a module is referenced by stack or backing
121                /// store memory, the ModuleWriteFlags member of the MINIDUMP_CALLBACK_OUTPUT
122                /// structure is set to ModuleReferencedByMemory.
123                /// </summary>
124                MiniDumpScanMemory = 0x00000010,
125
126                /// <summary>
127                /// Include information from the list of modules that were recently unloaded,
128                /// if this information is maintained by the operating system.
129                /// </summary>
130                MiniDumpWithUnloadedModules = 0x00000020,
131
132                /// <summary>
133                /// Include pages with data referenced by locals or other stack memory.
134                /// This option can increase the size of the minidump file significantly.
135                /// </summary>
136                MiniDumpWithIndirectlyReferencedMemory = 0x00000040,
137
138                /// <summary>
139                /// Filter module paths for information such as user names or important
140                /// directories. This option may prevent the system from locating the image
141                /// file and should be used only in special situations.
142                /// </summary>
143                MiniDumpFilterModulePaths = 0x00000080,
144
145                /// <summary>
146                /// Include complete per-process and per-thread information from the operating
147                /// system.
148                /// </summary>
149                MiniDumpWithProcessThreadData = 0x00000100,
150
151                /// <summary>
152                /// Scan the virtual address space for PAGE_READWRITE memory to be included.
153                /// </summary>
154                MiniDumpWithPrivateReadWriteMemory = 0x00000200,
155
156                /// <summary>
157                /// Reduce the data that is dumped by eliminating memory regions that are not
158                /// essential to meet criteria specified for the dump. This can avoid dumping
159                /// memory that may contain data that is private to the user. However, it is
160                /// not a guarantee that no private information will be present.
161                /// </summary>
162                MiniDumpWithoutOptionalData = 0x00000400,
163
164                /// <summary>
165                /// Include memory region information. For more information, see
166                /// MINIDUMP_MEMORY_INFO_LIST.
167                /// </summary>
168                MiniDumpWithFullMemoryInfo = 0x00000800,
169
170                /// <summary>
171                /// Include thread state information. For more information, see
172                /// MINIDUMP_THREAD_INFO_LIST.
173                /// </summary>
174                MiniDumpWithThreadInfo = 0x00001000,
175
176                /// <summary>
177                /// Include all code and code-related sections from loaded modules to capture
178                /// executable content. For per-module control, use the ModuleWriteCodeSegs
179                /// enumeration value from MODULE_WRITE_FLAGS.
180                /// </summary>
181                MiniDumpWithCodeSegs = 0x00002000,
182
183                /// <summary>
184                /// Turns off secondary auxiliary-supported memory gathering.
185                /// </summary>
186                MiniDumpWithoutAuxiliaryState = 0x00004000,
187
188                /// <summary>
189                /// Requests that auxiliary data providers include their state in the dump
190                /// image; the state data that is included is provider dependent. This option
191                /// can result in a large dump image.
192                /// </summary>
193                MiniDumpWithFullAuxiliaryState = 0x00008000,
194
195                /// <summary>
196                /// Scans the virtual address space for PAGE_WRITECOPY memory to be included.
197                /// </summary>
198                MiniDumpWithPrivateWriteCopyMemory = 0x00010000,
199
200                /// <summary>
201                /// If you specify MiniDumpWithFullMemory, the MiniDumpWriteDump function will
202                /// fail if the function cannot read the memory regions; however, if you include
203                /// MiniDumpIgnoreInaccessibleMemory, the MiniDumpWriteDump function will
204                /// ignore the memory read failures and continue to generate the dump. Note that
205                /// the inaccessible memory regions are not included in the dump.
206                /// </summary>
207                MiniDumpIgnoreInaccessibleMemory = 0x00020000,
208
209                /// <summary>
210                /// Adds security token related data. This will make the "!token" extension work
211                /// when processing a user-mode dump.
212                /// </summary>
213                MiniDumpWithTokenInformation = 0x00040000
214            }
215
216            /// <summary>
217            /// Contains the exception information written to the minidump file by the
218            /// MiniDumpWriteDump function.
219            /// </summary>
220            [StructLayout(LayoutKind.Sequential, Pack = 4)]
221            public struct MiniDumpExceptionInfo
222            {
223                /// <summary>
224                /// The identifier of the thread throwing the exception.
225                /// </summary>
226                public uint ThreadId;
227
228                /// <summary>
229                ///  A pointer to an EXCEPTION_POINTERS structure specifying a
230                ///  computer-independent description of the exception and the processor
231                ///  context at the time of the exception.
232                /// </summary>
233                public IntPtr ExceptionPointers;
234
235                /// <summary>
236                /// Determines where to get the memory regions pointed to by the
237                /// ExceptionPointers member. Set to TRUE if the memory resides in the
238                /// process being debugged (the target process of the debugger). Otherwise,
239                /// set to FALSE if the memory resides in the address space of the calling
240                /// program (the debugger process). If you are accessing local memory (in
241                /// the calling process) you should not set this member to TRUE.
242                /// </summary>
243                [MarshalAs(UnmanagedType.Bool)]
244                public bool ClientPointers;
245            }
246        }
247
248        /// <summary>
249        /// Initialises the BlackBox handler. Call this initialiser once throughout
250        /// the lifespan of the application.
251        /// </summary>
252        /// <returns>The global BlackBox instance.</returns>
253        public static BlackBox Get()
254        {
255            if (Instance == null)
256                Instance = new BlackBox();
257            return Instance;
258        }
259
260        /// <summary>
261        /// Creates a new BlackBox report based on the exception provided.
262        /// </summary>
263        /// <param name="e">The exception which triggered this dump.</param>
264        public void CreateReport(Exception e)
265        {
266            if (e == null)
267                throw new ArgumentNullException("e");
268
269            //Generate a unique identifier for this report.
270            string crashName = DateTime.Now.ToString(CrashReportName, CultureInfo.InvariantCulture);
271            string currentCrashReport = Path.Combine(CrashReportsPath, crashName);
272            Directory.CreateDirectory(currentCrashReport);
273
274            //Write a memory dump to the folder
275            WriteMemoryDump(currentCrashReport, e);
276
277            //Then write a user-readable summary
278            WriteDebugLog(currentCrashReport, e);
279
280            //Take a screenshot
281            WriteScreenshot(currentCrashReport);
282        }
283
284        /// <summary>
285        /// Enumerates the list of crash dumps waiting for upload.
286        /// </summary>
287        /// <returns>A string array containing the list of dumps waiting for upload.</returns>
288        public BlackBoxReport[] GetDumps()
289        {
290            DirectoryInfo dirInfo = new DirectoryInfo(CrashReportsPath);
291            List<BlackBoxReport> result = new List<BlackBoxReport>();
292            if (dirInfo.Exists)
293                foreach (DirectoryInfo subDir in dirInfo.GetDirectories())
294                    result.Add(new BlackBoxReport(Path.Combine(CrashReportsPath, subDir.Name)));
295
296            return result.ToArray();
297        }
298
299        /// <summary>
300        /// Constructor. Use the <see cref="Initialise"/> function to use this class.
301        /// </summary>
302        private BlackBox()
303        {
304            AppDomain.CurrentDomain.UnhandledException += OnUnhandledException;
305            Application.SetUnhandledExceptionMode(UnhandledExceptionMode.ThrowException);
306        }
307
308        /// <summary>
309        /// Called when an unhandled exception is raised in the application.
310        /// </summary>
311        private void OnUnhandledException(object sender, UnhandledExceptionEventArgs e)
312        {
313            CreateReport(e.ExceptionObject as Exception);
314        }
315
316        /// <summary>
317        /// Dumps the contents of memory to a dumpfile.
318        /// </summary>
319        /// <param name="dumpFolder">Path to the folder to store the dump file.</param>
320        /// <param name="e">The exception which is being handled.</param>
321        private void WriteMemoryDump(string dumpFolder, Exception e)
322        {
323            //Open a file stream
324            using (FileStream stream = new FileStream(Path.Combine(dumpFolder, MemoryDumpFileName),
325                FileMode.OpenOrCreate, FileAccess.Write, FileShare.None))
326            {
327                //Store the exception information
328                NativeMethods.MiniDumpExceptionInfo exception =
329                    new NativeMethods.MiniDumpExceptionInfo();
330                exception.ClientPointers = false;
331                exception.ExceptionPointers = Marshal.GetExceptionPointers();
332                exception.ThreadId = (uint)AppDomain.GetCurrentThreadId();
333
334                NativeMethods.MiniDumpWriteDump(Process.GetCurrentProcess().Handle,
335                    (uint)Process.GetCurrentProcess().Id, stream.SafeFileHandle,
336                    NativeMethods.MiniDumpType.MiniDumpWithFullMemory,
337                    ref exception, IntPtr.Zero, IntPtr.Zero);
338            }
339        }
340
341        /// <summary>
342        /// Writes a debug log to the given directory.
343        /// </summary>
344        /// <param name="screenshotPath">The path to store the screenshot into.</param>
345        /// <param name="exception">The exception to log about.</param>
346        private void WriteDebugLog(string dumpFolder, Exception exception)
347        {
348            using (FileStream file = new FileStream(Path.Combine(dumpFolder, DebugLogFileName),
349                FileMode.OpenOrCreate, FileAccess.Write, FileShare.None))
350            using (StreamWriter stream = new StreamWriter(file))
351            {
352                //Application information
353                string separator = new string('-', 76);
354                string lineFormat = "{0,15}: {1}";
355                stream.WriteLine("Application Information");
356                stream.WriteLine(separator);
357                stream.WriteLine(string.Format(lineFormat, "Version",
358                    Assembly.GetEntryAssembly().GetName().Version));
359                StringBuilder commandLine = new StringBuilder();
360                foreach (string param in Environment.GetCommandLineArgs())
361                {
362                    commandLine.Append(param);
363                    commandLine.Append(' ');
364                }
365                stream.WriteLine(string.Format(lineFormat, "Command Line",
366                    commandLine.ToString().Trim()));
367
368                //Exception Information
369                stream.WriteLine();
370                stream.WriteLine("Exception Information (Outermost to innermost)");
371                stream.WriteLine(separator);
372
373                //Open a stream to the Stack Trace Log file. We want to separate the stack
374                //trace do we can check against the server to see if the crash is a new one
375                using (StreamWriter stackTraceLog = new StreamWriter(
376                    Path.Combine(dumpFolder, StackTraceFileName)))
377                {
378                    Exception currentException = exception;
379                    for (uint i = 1; currentException != null; ++i)
380                    {
381                        stream.WriteLine(string.Format("Exception {0}:", i));
382                        stream.WriteLine(string.Format(lineFormat, "Message", currentException.Message));
383                        stream.WriteLine(string.Format(lineFormat, "Exception Type",
384                            currentException.GetType().FullName));
385                        stackTraceLog.WriteLine(string.Format("Exception {0}: {1}", i,
386                            currentException.GetType().FullName));
387
388                        //Parse the stack trace
389                        string[] stackTrace = currentException.StackTrace.Split(new char[] { '\n' });
390                        for (uint j = 0; j < stackTrace.Length; ++j)
391                        {
392                            stream.WriteLine(string.Format(lineFormat,
393                                string.Format("Stack Trace [{0}]", j), stackTrace[j].Trim()));
394                            stackTraceLog.WriteLine(string.Format("{0}", stackTrace[j].Trim()));
395                        }
396
397                        uint k = 0;
398                        foreach (System.Collections.DictionaryEntry value in currentException.Data)
399                            stream.WriteLine(string.Format(lineFormat, string.Format("Data[{0}]", ++k),
400                                string.Format("{0} {1}", value.Key.ToString(), value.Value.ToString())));
401
402                        //End the exception and get the inner exception.
403                        stream.WriteLine();
404                        currentException = exception.InnerException;
405                    }
406                }
407            }
408        }
409
410        /// <summary>
411        /// Writes a screenshot to the given directory
412        /// </summary>
413        /// <param name="dumpFolder">The path to save the screenshot to.</param>
414        private void WriteScreenshot(string dumpFolder)
415        {
416            //Get the size of the screen
417            Rectangle rect = new Rectangle(int.MaxValue, int.MaxValue, int.MinValue, int.MinValue);
418            foreach (Screen screen in Screen.AllScreens)
419                rect = Rectangle.Union(rect, screen.Bounds);
420
421            //Copy a screen DC to the screenshot bitmap
422            Bitmap screenShot = new Bitmap(rect.Width, rect.Height);
423            Graphics bitmap = Graphics.FromImage(screenShot);
424            bitmap.CopyFromScreen(0, 0, 0, 0, rect.Size, CopyPixelOperation.SourceCopy);
425
426            //Save the bitmap to disk
427            screenShot.Save(Path.Combine(dumpFolder, ScreenshotFileName), ImageFormat.Png);
428        }
429
430        /// <summary>
431        /// The global BlackBox instance.
432        /// </summary>
433        private static BlackBox Instance;
434
435        /// <summary>
436        /// The path to all Eraser crash reports.
437        /// </summary>
438        private static readonly string CrashReportsPath = Path.Combine(Environment.GetFolderPath(
439            Environment.SpecialFolder.LocalApplicationData), @"Eraser 6\Crash Reports");
440
441        /// <summary>
442        /// The report name format.
443        /// </summary>
444        internal static readonly string CrashReportName = "yyyyMMdd HHmmss.FFF";
445
446        /// <summary>
447        /// The file name of the memory dump.
448        /// </summary>
449        ///
450        internal static readonly string MemoryDumpFileName = "Memory.dmp";
451
452        /// <summary>
453        /// The file name of the debug log.
454        /// </summary>
455        internal static readonly string DebugLogFileName = "Debug.log";
456
457        /// <summary>
458        /// The file name of the screenshot.
459        /// </summary>
460        internal static readonly string ScreenshotFileName = "Screenshot.png";
461
462        /// <summary>
463        /// The file name of the stack trace.
464        /// </summary>
465        internal static readonly string StackTraceFileName = "Stack Trace.log";
466    }
467
468    /// <summary>
469    /// Represents one BlackBox crash report.
470    /// </summary>
471    public class BlackBoxReport
472    {
473        /// <summary>
474        /// Constructor.
475        /// </summary>
476        /// <param name="path">Path to the folder containing the memory dump, screenshot and
477        /// debug log.</param>
478        internal BlackBoxReport(string path)
479        {
480            Path = path;
481
482            string[] stackTrace = null;
483            using (StreamReader reader = new StreamReader(
484                System.IO.Path.Combine(Path, BlackBox.StackTraceFileName)))
485            {
486                stackTrace = reader.ReadToEnd().Split(new char[] { '\n' });
487            }
488
489            //Parse the lines in the file.
490            StackTraceCache = new List<BlackBoxExceptionEntry>();
491            List<string> currentException = new List<string>();
492            string exceptionType = null;
493            foreach (string str in stackTrace)
494            {
495                if (str.StartsWith("Exception "))
496                {
497                    //Add the current exception to the list of exceptions.
498                    if (currentException.Count != 0)
499                    {
500                        StackTraceCache.Add(new BlackBoxExceptionEntry(exceptionType,
501                            new List<string>(currentException)));
502                        currentException.Clear();
503                    }
504
505                    //Set the exception type for the next exception.
506                    exceptionType = str.Substring(str.IndexOf(':') + 1).Trim();
507                }
508                else if (!string.IsNullOrEmpty(str.Trim()))
509                {
510                    currentException.Add(str.Trim());
511                }
512            }
513
514            if (currentException.Count != 0)
515                StackTraceCache.Add(new BlackBoxExceptionEntry(exceptionType, currentException));
516        }
517
518        /// <summary>
519        /// Deletes the report and its contents.
520        /// </summary>
521        public void Delete()
522        {
523            Directory.Delete(Path, true);
524        }
525
526        /// <summary>
527        /// The name of the report.
528        /// </summary>
529        public string Name
530        {
531            get
532            {
533                return System.IO.Path.GetFileName(Path);
534            }
535        }
536
537        /// <summary>
538        /// The timestamp of the report.
539        /// </summary>
540        public DateTime Timestamp
541        {
542            get
543            {
544                return DateTime.ParseExact(Name, BlackBox.CrashReportName,
545                    CultureInfo.InvariantCulture);
546            }
547        }
548
549        /// <summary>
550        /// The path to the folder containing the report.
551        /// </summary>
552        public string Path
553        {
554            get;
555            private set;
556        }
557
558        /// <summary>
559        /// The files which comprise the error report.
560        /// </summary>
561        public ReadOnlyCollection<FileInfo> Files
562        {
563            get
564            {
565                List<FileInfo> result = new List<FileInfo>();
566                DirectoryInfo directory = new DirectoryInfo(Path);
567                foreach (FileInfo file in directory.GetFiles())
568                    if (!InternalFiles.Contains(file.Name))
569                        result.Add(file);
570
571                return result.AsReadOnly();
572            }
573        }
574
575        /// <summary>
576        /// Gets a read-only stream which reads the Debug log.
577        /// </summary>
578        public Stream DebugLog
579        {
580            get
581            {
582                return new FileStream(System.IO.Path.Combine(Path, BlackBox.DebugLogFileName),
583                    FileMode.Open, FileAccess.Read);
584            }
585        }
586
587        /// <summary>
588        /// Gets the stack trace for this crash report.
589        /// </summary>
590        public ReadOnlyCollection<BlackBoxExceptionEntry> StackTrace
591        {
592            get
593            {
594                return StackTraceCache.AsReadOnly();
595            }
596        }
597
598        /// <summary>
599        /// Gets or sets whether the given report has been uploaded to the server.
600        /// </summary>
601        public bool Submitted
602        {
603            get
604            {
605                byte[] buffer = new byte[1];
606                using (FileStream stream = new FileStream(System.IO.Path.Combine(Path, StatusFileName),
607                    FileMode.OpenOrCreate, FileAccess.Read, FileShare.Read))
608                {
609                    stream.Read(buffer, 0, buffer.Length);
610                }
611
612                return buffer[0] == 1;
613            }
614
615            set
616            {
617                byte[] buffer = { Convert.ToByte(value) };
618                using (FileStream stream = new FileStream(System.IO.Path.Combine(Path, StatusFileName),
619                    FileMode.OpenOrCreate, FileAccess.Write, FileShare.Read))
620                {
621                    stream.Write(buffer, 0, buffer.Length);
622                }
623            }
624        }
625
626        public override string ToString()
627        {
628            return Name;
629        }
630
631        /// <summary>
632        /// The backing variable for the <see cref="StackTrace"/> field.
633        /// </summary>
634        private List<BlackBoxExceptionEntry> StackTraceCache;
635
636        /// <summary>
637        /// The file name for the status file.
638        /// </summary>
639        private static readonly string StatusFileName = "Status.txt";
640
641        /// <summary>
642        /// The list of files internal to the report.
643        /// </summary>
644        private static readonly List<string> InternalFiles = new List<string>(
645            new string[] {
646                 BlackBox.StackTraceFileName,
647                 "Status.txt"
648            }
649        );
650    }
651
652    /// <summary>
653    /// Represents one exception which can be chained <see cref="InnerException"/>
654    /// to represent the exception handled by BlackBox
655    /// </summary>
656    public class BlackBoxExceptionEntry
657    {
658        /// <summary>
659        /// Constructor.
660        /// </summary>
661        /// <param name="exceptionType">The type of the exception.</param>
662        /// <param name="stackTrace">The stack trace for this exception.</param>
663        internal BlackBoxExceptionEntry(string exceptionType, List<string> stackTrace)
664        {
665            ExceptionType = exceptionType;
666            StackTraceCache = stackTrace;
667        }
668
669        /// <summary>
670        /// The type of the exception.
671        /// </summary>
672        public string ExceptionType
673        {
674            get;
675            private set;
676        }
677
678        /// <summary>
679        /// The stack trace for this exception.
680        /// </summary>
681        public ReadOnlyCollection<string> StackTrace
682        {
683            get
684            {
685                return StackTraceCache.AsReadOnly();
686            }
687        }
688
689        /// <summary>
690        /// The backing variable for the <see cref="StackTrace"/> property.
691        /// </summary>
692        private List<string> StackTraceCache;
693    }
694}
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