大家應該知道 .NET異常 本質上就是一個 Object 對象，也就是說只要你執行了 new XXException() 語句，那么它就會分配到 GC Heap 上。

這也就意味著，如果你有一個進程的dump文件，那你就可以從dump中導出程序最近都拋了什么異常，換句話說只要這些異常沒有被 GC 回收，你都可以給它找出來。

實現起來很簡單，只要在 windbg 中輸入如下命令即可。

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

如果你想看某一個具體異常的詳細信息，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:?<none> StackTrace?(generated):SP???????IP???????Function024AF2C8?0FE3125E?App_Code_da2s7oyo!BuggyMail.IsValidEmailAddress(System.String)+0x76024AF2E8?0FE31192?App_Code_da2s7oyo!BuggyMail.SendEmail(System.String,?System.String)+0x4aStackTraceString:?<none> HResult:?80131500 There?are?nested?exceptions?on?this?thread.?Run?with?-nested?for?details

那現在問題來了，我想看所有異常的詳細信息怎么辦呢？人肉一個一個的用 !pe 命令去執行，那將會多惡心。。。所以友好的方式就是寫腳本去提速，這里我使用 .foreach 命令。

.foreach?(ex?{!dumpheap?-type?Exception?-short}){.echo?"********************************";!pe?${ex}?}

上面我用了一個 -short 參數，目的就是只輸出 address 地址方便腳本遍歷，然后將迭代項送入 !pe ，輸出結果如下：

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:?<none> StackTrace?(generated):SP???????IP???????Function024AF2C8?0FE3125E?App_Code_da2s7oyo!BuggyMail.IsValidEmailAddress(System.String)+0x76024AF2E8?0FE31192?App_Code_da2s7oyo!BuggyMail.SendEmail(System.String,?System.String)+0x4aStackTraceString:?<none> 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:?<none> StackTrace?(generated):SP???????IP???????Function024AF044?792741F2?mscorlib_ni!System.IO.__Error.WinIOError(Int32,?System.String)+0xc2024AF0A0?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)+0x48b024AF198?792EA882?mscorlib_ni!System.IO.FileStream..ctor(System.String,?System.IO.FileMode,?System.IO.FileAccess,?System.IO.FileShare,?Int32,?System.IO.FileOptions)+0x42024AF1C0?7927783F?mscorlib_ni!System.IO.StreamWriter.CreateFile(System.String,?Boolean)+0x3f024AF1D4?792777DB?mscorlib_ni!System.IO.StreamWriter..ctor(System.String,?Boolean,?System.Text.Encoding,?Int32)+0x3b024AF1F4?797EE19F?mscorlib_ni!System.IO.StreamWriter..ctor(System.String)+0x1f024AF204?0FE31325?App_Code_da2s7oyo!Utility.WriteToLog(System.String,?System.String)+0x5dStackTraceString:?<none> 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:?<none> StackTrace?(generated):SP???????IP???????Function024AEF60?792741F2?mscorlib_ni!System.IO.__Error.WinIOError(Int32,?System.String)+0xc2024AEFBC?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)+0x48b024AF0B4?792EA882?mscorlib_ni!System.IO.FileStream..ctor(System.String,?System.IO.FileMode,?System.IO.FileAccess,?System.IO.FileShare,?Int32,?System.IO.FileOptions)+0x42024AF0DC?7927783F?mscorlib_ni!System.IO.StreamWriter.CreateFile(System.String,?Boolean)+0x3f024AF0F0?792777DB?mscorlib_ni!System.IO.StreamWriter..ctor(System.String,?Boolean,?System.Text.Encoding,?Int32)+0x3b024AF110?797EE19F?mscorlib_ni!System.IO.StreamWriter..ctor(System.String)+0x1f024AF120?0FE31325?App_Code_da2s7oyo!Utility.WriteToLog(System.String,?System.String)+0x5dStackTraceString:?<none> HResult:?80070003 There?are?nested?exceptions?on?this?thread.?Run?with?-nested?for?details

當然你也可以打印出當前異常的內部異常，配上一個 -nest 參數即可。

.foreach?(ex?{!dumpheap?-type?Exception?-short}){.echo?"********************************";!pe?–nested?${ex}?}

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