本文介绍了AggregateExceptions进行处理压扁的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我运行到哪里我称之为拼合上的 AggregateException ，但里面仍有几个问题另一个 AggregateException ！这显然意味着，他们正在向上传播链和被轧成另一个 AggregateException 。有没有一种方法可以递归拼合所有内AggregateExceptions？通常情况下，我将使用手柄委托处理这些，但如果有另一个内部AggregateExceeption返回false。我不能处理这些正确
I'm running into a few issues where I call flatten on an AggregateException, but inside there is still ANOTHER AggregateException! This obviously means that they are being propagated up the chain and being rolled into another AggregateException. Is there a way to recursively flatten ALL inner AggregateExceptions? Usually, I'll use the handle delegate to process these, but it returns false if there is another inner AggregateExceeption. Am I not handling these properly?
编辑：既然我已经打电话展平，看来这个问题是，它没有被抓住，直到后来在调用堆栈的方式。这里是我打电话平展（）的代码。在堆栈使用跟踪这种方法被称为WriteExceptionRecord（字符串，FileInfo的）：
Since I already am calling Flatten, it appears that the issue is that it's not being caught until way later in the callstack. Here is the code where I'm calling Flatten(). For use in the stack trace this method is called WriteExceptionRecord(string, FileInfo):
do
{
try
{
using (var stream = file.Open(FileMode.Append, FileAccess.Write, FileShare.None))
{
using (StreamWriter writer = new StreamWriter(stream))
{
await writer.WriteLineAsync(data);
}
}
}
catch (AggregateException ex)
{
ex.Flatten().Handle((x) =>
{
if (x is IOException)
{
retryNeeded = true;
retryLeft--;
Thread.Sleep(500);
return true;
}
logger.ErrorException("Could not write to exception file: " + data, ex);
return false;
});
}
}
while (retryNeeded && retryLeft > 0);
然而，堆栈跟踪表明，它没有被抓到这里来。相反，它被后来的方式调用堆栈向上抓获。下面是出于安全考虑，去掉了一些标识信息跟踪：
However, the stack trace shows that it's not being caught here. Instead it's being caught way later up the call stack. Below is the trace with some identifying information removed for security reasons:
System.AggregateException: One or more errors occurred. --->
System.AggregateException: One or more errors occurred. --->
System.IO.IOException: The process cannot access the file 'X:\Production\ProductionBatches\DataEntry\J\PD\Exception.csv' because it is being used by another process.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
at System.IO.FileInfo.Open(FileMode mode, FileAccess access, FileShare share)
at PDI.LoadFileProcessing.<WriteExceptionRecord>d__21.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\LoadFileProcessing.cs:line 328
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at PDI.LoadFileProcessing.<ExceptionRecordProcessing>d__17.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\LoadFileProcessing.cs:line 316
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at PDI.ProcessPipeline.<>c__DisplayClass9.<<ProcessBatch>b__2>d__13.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\ProcessPipeline.cs:line 61
--- End of inner exception stack trace ---
--- End of inner exception stack trace ---
---> (Inner Exception #0) System.AggregateException: One or more errors occurred. ---> System.IO.IOException: The process cannot access the file 'X:\Production\ProductionBatches\DataEntry\J\PD\Exception.csv' because it is being used by another process.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
at System.IO.FileInfo.Open(FileMode mode, FileAccess access, FileShare share)
at PeopleDocImporter.LoadFileProcessing.<WriteExceptionRecord>d__21.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\LoadFileProcessing.cs:line 328
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at PDI.LoadFileProcessing.<ExceptionRecordProcessing>d__17.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\LoadFileProcessing.cs:line 316
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at PDI.ProcessPipeline.<>c__DisplayClass9.<<ProcessBatch>b__2>d__13.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\ProcessPipeline.cs:line 61
--- End of inner exception stack trace ---
---> (Inner Exception #0) System.IO.IOException: The process cannot access the file 'X:\Production\ProductionBatches\DataEntry\J\PD\Exception.csv' because it is being used by another process.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
at System.IO.FileInfo.Open(FileMode mode, FileAccess access, FileShare share)
at PDI.LoadFileProcessing.<WriteExceptionRecord>d__21.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\LoadFileProcessing.cs:line 328
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at PDI.LoadFileProcessing.<ExceptionRecordProcessing>d__17.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\LoadFileProcessing.cs:line 316
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at PDI.ProcessPipeline.<>c__DisplayClass9.<<ProcessBatch>b__2>d__13.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\ProcessPipeline.cs:line 61<---
<---
System.AggregateException: One or more errors occurred. ---> System.AggregateException: One or more errors occurred. ---> System.IO.IOException: The process cannot access the file 'X:\Production\ProductionBatches\DataEntry\J\PD\Exception.csv' because it is being used by another process.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
at System.IO.FileInfo.Open(FileMode mode, FileAccess access, FileShare share)
at PDI.LoadFileProcessing.<WriteExceptionRecord>d__21.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\LoadFileProcessing.cs:line 328
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at PDI.LoadFileProcessing.<ExceptionRecordProcessing>d__17.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\LoadFileProcessing.cs:line 316
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at PDI.ProcessPipeline.<>c__DisplayClass9.<<ProcessBatch>b__2>d__13.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\ProcessPipeline.cs:line 61
--- End of inner exception stack trace ---
---> (Inner Exception #0) System.AggregateException: One or more errors occurred. ---> System.IO.IOException: The process cannot access the file 'X:\J\PD\Exception.csv' because it is being used by another process.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
at System.IO.FileInfo.Open(FileMode mode, FileAccess access, FileShare share)
at PDI.LoadFileProcessing.<WriteExceptionRecord>d__21.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\LoadFileProcessing.cs:line 328
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at PDI.LoadFileProcessing.<ExceptionRecordProcessing>d__17.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\LoadFileProcessing.cs:line 316
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at PDI.ProcessPipeline.<>c__DisplayClass9.<<ProcessBatch>b__2>d__13.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\ProcessPipeline.cs:line 61
--- End of inner exception stack trace ---
---> (Inner Exception #0) System.IO.IOException: The process cannot access the file 'X:\Production\ProductionBatches\DataEntry\J\PD\Exception.csv' because it is being used by another process.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
at System.IO.FileInfo.Open(FileMode mode, FileAccess access, FileShare share)
at PDI.LoadFileProcessing.<WriteExceptionRecord>d__21.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\LoadFileProcessing.cs:line 328
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at PDI.LoadFileProcessing.<ExceptionRecordProcessing>d__17.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\LoadFileProcessing.cs:line 316
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at PDI.ProcessPipeline.<>c__DisplayClass9.<<ProcessBatch>b__2>d__13.MoveNext() in c:\Users\XYZ\Development\PDI\PDI\ProcessPipeline.cs:line 61<---
由方法：这是由TPL-数据流块名为
By the way: This is being called by TPL-Dataflow blocks.
推荐答案
是的，有什么你问的：
AggreggateException.Flatten()
将通过和压缩都记录下来，以一个单一的AggregateException。所以，你可以通过像这样所有的内部异常用它来循环：
will go through and compress everything down to a single AggregateException. So you can use it to loop through the all the inner exceptions like this:
try
{
// something dangerous
}
catch (AggregateException ae)
{
foreach(var innerException in ae.Flatten().InnerExceptions)
{
// handle error
}
}
MSDN链接：
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