例外情况。网络线程池线程

How to catch exceptions from a ThreadPool.QueueUserWorkItem?

我正在排队等候多名代表。Net ThreadPool用于大量独立的远程处理调用,这些调用本身调用多个数据库和其他脱机资源。通过在ThreadPool上排队这些调用,我可以同时运行它们并最大限度地减少整体延迟。

private void CompleteAndQueuePayLoads(IEnumerable<UsagePayload> payLoads)
{
    List<WaitHandle> waitHndls = new List<WaitHandle>();
    foreach (UsagePayload uPyLd in payLoads)
    {
        ManualResetEvent txEvnt = new ManualResetEvent(false);
        UsagePayload uPyLd1 = uPyLd ;
        ThreadPool.QueueUserWorkItem(
            delegate
                {
                    if (!uPyLd1 .IsComplete)
                        // IEEDAL.GetPayloadReadings is long running DB call
                        try { IEEDAL.GetPayloadReadings(uPyLd1 ); }
                        catch (IEEAccessException iX)
                        {
                            log.Write(log.Level.Error,
                                  "IEEWSDAL.CompleteAndQueuePayLoads " + 
                                   " Delegate Failed " +
                                  iX.Message, iX);
                            txEvnt.Set();
                            throw;  // this causes parent thread to crash!
                            // was going to try Thread.Abort next ...
                            // Thread.CurrentThread.Abort();
                        }
                    UsageCache.PersistPayload(uPyLd1 );
                    SavePayLoadToProcessQueueFolder(uPyLd1 );
                    txEvnt.Set();
                });
        waitHndls.Add(txEvnt);
    }
    util.WaitAll(waitHndls.ToArray()); //To waitone on > 64 waithandles
}

但是整个批处理需要以事务方式处理,也就是说,只有在所有子线程都成功的情况下,才允许父线程的输出继续进行。我已经将子线程编码为在失败时抛出自定义异常,但我发现这会导致父线程崩溃,因为这些异常无法在父线程中“捕获”。..