共计 4693 个字符,预计需要花费 12 分钟才能阅读完成。
导读 | 大家应该知道 .NET 异常 本质上就是一个 Object 对象,也就是说只要你执行了 new XXException() 语句,那么它就会分配到 GC Heap 上。 |
这也就意味着,如果你有一个进程的 dump 文件,那你就可以从 dump 中导出程序最近都抛了什么异常,换句话说只要这些异常没有被 GC 回收,你都可以给它找出来。
实现起来很简单,只要在 windbg 中输入如下命令即可。
0:015> !dumpheap -type Exception
------------------------------
Heap 0
Address MT Size
02ea6b0c 79330a80 72
02ea75f0 7930eab4 76
…
06f57aa4 7930eab4 76
06f5829c 7930eab4 76
06f58a94 7930eab4 76
06f5928c 7930eab4 76
06f59a84 7930eab4 76
06f5a27c 7930eab4 76
06f5aa74 7930eab4 76
06f5b26c 7930eab4 76
06f5ba64 7930eab4 76
06f5c25c 7930eab4 76
06f5ca54 7930eab4 76
06f5d24c 7930eab4 76
total 319 objects
------------------------------
total 656 objects
Statistics:
MT Count TotalSize Class Name
79333dc0 1 12 System.Text.DecoderExceptionFallback
79333d7c 1 12 System.Text.EncoderExceptionFallback
793172f8 2 64 System.UnhandledExceptionEventHandler
79330c30 1 72 System.ExecutionEngineException
79330ba0 1 72 System.StackOverflowException
79330b10 1 72 System.OutOfMemoryException
79330a80 1 72 System.Exception
79330cc0 2 144 System.Threading.ThreadAbortException
7930eab4 646 49096 System.IO.DirectoryNotFoundException
Total 656 objects
如果你想看某一个具体异常的详细信息,可以使用命令 !pe 02ea6b0c。
!pe 02ea6b0c
Exception object: 02ea6b0c
Exception type: System.Exception
Message: The email entered is not a valid email address
InnerException:
StackTrace (generated):
SP IP Function
024AF2C8 0FE3125E App_Code_da2s7oyo!BuggyMail.IsValidEmailAddress(System.String)+0x76
024AF2E8 0FE31192 App_Code_da2s7oyo!BuggyMail.SendEmail(System.String, System.String)+0x4a
StackTraceString:
HResult: 80131500
There are nested exceptions on this thread. Run with -nested for details
那现在问题来了,我想看所有异常的详细信息怎么办呢? 人肉一个一个的用 !pe 命令去执行,那将会多恶心。。。所以友好的方式就是写脚本去提速,这里我使用 .foreach 命令。
.foreach (ex {!dumpheap -type Exception -short}){.echo "********************************";!pe ${ex} }
上面我用了一个 -short 参数,目的就是只输出 address 地址方便脚本遍历,然后将迭代项送入 !pe,输出结果如下:
0:015>.foreach (ex {!dumpheap -type Exception -short}){.echo "********************************";!pe ${ex} }
******************************** Exception object: 02ea6b0c Exception type: System.Exception Message: The email entered is not a valid email address InnerException:StackTrace (generated): SP IP Function 024AF2C8 0FE3125E App_Code_da2s7oyo!BuggyMail.IsValidEmailAddress(System.String)+0x76 024AF2E8 0FE31192 App_Code_da2s7oyo!BuggyMail.SendEmail(System.String, System.String)+0x4a StackTraceString: HResult: 80131500 There are nested exceptions on this thread. Run with -nested for details ******************************** Exception object: 02ea75f0 Exception type: System.IO.DirectoryNotFoundException Message: Could not find a part of the path 'c:\idontexist\log.txt'. InnerException: StackTrace (generated): SP IP Function 024AF044 792741F2 mscorlib_ni!System.IO.__Error.WinIOError(Int32, System.String)+0xc2 024AF0A0 792EB22B mscorlib_ni!System.IO.FileStream.Init(System.String, System.IO.FileMode, System.IO.FileAccess, Int32, Boolean, System.IO.FileShare, Int32, System.IO.FileOptions, SECURITY_ATTRIBUTES, System.String, Boolean)+0x48b 024AF198 792EA882 mscorlib_ni!System.IO.FileStream..ctor(System.String, System.IO.FileMode, System.IO.FileAccess, System.IO.FileShare, Int32, System.IO.FileOptions)+0x42 024AF1C0 7927783F mscorlib_ni!System.IO.StreamWriter.CreateFile(System.String, Boolean)+0x3f 024AF1D4 792777DB mscorlib_ni!System.IO.StreamWriter..ctor(System.String, Boolean, System.Text.Encoding, Int32)+0x3b 024AF1F4 797EE19F mscorlib_ni!System.IO.StreamWriter..ctor(System.String)+0x1f 024AF204 0FE31325 App_Code_da2s7oyo!Utility.WriteToLog(System.String, System.String)+0x5d StackTraceString: HResult: 80070003 There are nested exceptions on this thread. Run with -nested for details ******************************** Exception object: 02ea7de8 Exception type: System.IO.DirectoryNotFoundException Message: Could not find a part of the path 'c:\idontexist\log.txt'. InnerException: StackTrace (generated): SP IP Function 024AEF60 792741F2 mscorlib_ni!System.IO.__Error.WinIOError(Int32, System.String)+0xc2 024AEFBC 792EB22B mscorlib_ni!System.IO.FileStream.Init(System.String, System.IO.FileMode, System.IO.FileAccess, Int32, Boolean, System.IO.FileShare, Int32, System.IO.FileOptions, SECURITY_ATTRIBUTES, System.String, Boolean)+0x48b 024AF0B4 792EA882 mscorlib_ni!System.IO.FileStream..ctor(System.String, System.IO.FileMode, System.IO.FileAccess, System.IO.FileShare, Int32, System.IO.FileOptions)+0x42 024AF0DC 7927783F mscorlib_ni!System.IO.StreamWriter.CreateFile(System.String, Boolean)+0x3f 024AF0F0 792777DB mscorlib_ni!System.IO.StreamWriter..ctor(System.String, Boolean, System.Text.Encoding, Int32)+0x3b 024AF110 797EE19F mscorlib_ni!System.IO.StreamWriter..ctor(System.String)+0x1f 024AF120 0FE31325 App_Code_da2s7oyo!Utility.WriteToLog(System.String, System.String)+0x5d StackTraceString: HResult: 80070003 There are nested exceptions on this thread. Run with -nested for details
当然你也可以打印出当前异常的内部异常,配上一个 -nest 参数即可。
.foreach (ex {!dumpheap -type Exception -short}){.echo "********************************";!pe –nest
正文完
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