C#Parallel foreach-System.AggregateException:发生了一个或多个错误---&燃气轮机；System.IndexOutOfRangeException

找到答案。。。代码中的错误是我将数据添加到了错误的列表中

---

我知道这已经被问了好几次了，但我就是不明白为什么会出现一个例外，我是不是丢失了一个锁

var sendsToday = new List<TSend>();

var threads = _maxNumberOfThreads;
if (threads <= 0)
    threads = 1;

Parallel.ForEach(_subscribers,
    new ParallelOptions { MaxDegreeOfParallelism = threads },
    () => new ContentSendLocalStorage<TSend, TMedium>(_contentServices, _logService),
    (subscriber, loopState, localStorage) =>
    {
        localStorage.LogService.Warning(string.Format("Choosing content for subscriber {0}", subscriber.SubscriberId));
        foreach (var newsletterId in subscriber.SubscribedNewsletterIds)
        {
            localStorage.LogService.Warning(string.Format("Choosing content for newsletter {0}", newsletterId));
            var clicks = StateBag.Get<LookupList>(StateKeys.LookupList).Clicks.Where(c => c.Subscriber.SubscriberId == subscriber.SubscriberId).Select(c => c.Content.ContentId).ToArray();

            foreach (var contentService in _contentServices.Where(contentService => contentService.Contents.Count != 0))
            {
                subscriber.UrlsClicked = contentService.Contents
        .Where(c => clicks.Contains(c.ContentId))
        .GroupBy(g => g.Page.Url)
        .ToDictionary(k => k.Key, v => 1);

                var best = contentService.GetBestForSubscriber(subscriber, new TMedium { MediumId = int.Parse(newsletterId) });
                if (best != null)
        sendsToday.Add(best);
            }
        }

        localStorage.LogService.Warning(string.Format("Done choosing content for subscriber {0}", subscriber.SubscriberId));
        return localStorage;
    },
    finalStorage =>
    {
        lock (ContentSendLock)
        {
            sendsToday.AddRange(finalStorage.SubscriberSends);
        }
    });

var sendsToday=new List（）；
var threads=\u maxNumberOfThreads；
if（线程新ContentSendLocalStorage（\u contentServices，\u logService），
（订阅服务器、loopState、localStorage）=>
{
localStorage.LogService.Warning（string.Format（“为订阅服务器{0}选择内容”，subscriber.SubscriberId））；
foreach（订阅服务器中的var新闻稿ID.SubscribedNewsletteId）
{
localStorage.LogService.Warning（string.Format（“为时事通讯{0}选择内容”，时事通讯ID））；
var clicks=StateBag.Get（StateKeys.LookupList）.clicks.Where（c=>c.Subscriber.SubscriberId==Subscriber.SubscriberId）.选择（c=>c.Content.ContentId）.ToArray（）；
foreach（在_contentServices.Where中的var contentService（contentService=>contentService.Contents.Count！=0））
{
subscriber.UrlsClicked=contentService.Contents
.Where（c=>clicks.Contains（c.ContentId））
.GroupBy（g=>g.Page.Url）
.ToDictionary（k=>k.Key，v=>1）；
var best=contentService.GetBestForSubscriber（订阅者，新的TMedium{MediumId=int.Parse（newsletteId）}）；
如果（最佳！=null）
sendsToday.Add（最佳）；
}
}
localStorage.LogService.Warning（string.Format（“为订阅服务器{0}选择内容完成”，subscriber.SubscriberId））；
返回本地存储；
},
最终存储=>
{
锁（ContentSendLock）
{
sendsToday.AddRange（finalStorage.SubscriberSends）；
}
});

我一直得到以下例外情况：

System.AggregateException: One or more errors occurred. ---> System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at System.Collections.Generic.List`1.Add(T item)
   at WFM.Newsletter.Business.CORE.OptimizationEngine`2.<>c__DisplayClassd.<Start>b__4(Subscriber subscriber, ParallelLoopState loopState, ContentSendLocalStorage`2 localStorage)
   at System.Threading.Tasks.Parallel.<>c__DisplayClass21`2.<ForEachWorker>b__1a(Int32 i, ParallelLoopState state, TLocal local)
   at System.Threading.Tasks.Parallel.<>c__DisplayClassf`1.<ForWorker>b__c()
   at System.Threading.Tasks.Task.InnerInvoke()
   at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
   at System.Threading.Tasks.Task.<>c__DisplayClass7.<ExecuteSelfReplicating>b__6(Object )
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Parallel.ForWorker[TLocal](Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Func`4 bodyWithLocal, Func`1 localInit, Action`1 localFinally)
   at System.Threading.Tasks.Parallel.ForEachWorker[TSource,TLocal](TSource[] array, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Action`3 bodyWithStateAndIndex, Func`4 bodyWithStateAndLocal, Func`5 bodyWithEverything, Func`1 localInit, Action`1 localFinally)
   at System.Threading.Tasks.Parallel.ForEachWorker[TSource,TLocal](IEnumerable`1 source, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Action`3 bodyWithStateAndIndex, Func`4 bodyWithStateAndLocal, Func`5 bodyWithEverything, Func`1 localInit, Action`1 localFinally)
   at System.Threading.Tasks.Parallel.ForEach[TSource,TLocal](IEnumerable`1 source, ParallelOptions parallelOptions, Func`1 localInit, Func`4 body, Action`1 localFinally)
   at WFM.Newsletter.Business.CORE.OptimizationEngine`2.Start()
   at WFM.Newsletter.Business.CORE.OptimizationService.Start(IEnumerable`1 subscribers, IEnumerable`1 newsletters, LookupList lookupList, LocalConfig config, ILogging logService, Int32 maxNumberOfThreads, String subscriberClicksSourceTableName)
---> (Inner Exception #0) System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at System.Collections.Generic.List`1.Add(T item)
   at WFM.Newsletter.Business.CORE.OptimizationEngine`2.<>c__DisplayClassd.<Start>b__4(Subscriber subscriber, ParallelLoopState loopState, ContentSendLocalStorage`2 localStorage)
   at System.Threading.Tasks.Parallel.<>c__DisplayClass21`2.<ForEachWorker>b__1a(Int32 i, ParallelLoopState state, TLocal local)
   at System.Threading.Tasks.Parallel.<>c__DisplayClassf`1.<ForWorker>b__c()
   at System.Threading.Tasks.Task.InnerInvoke()
   at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
   at System.Threading.Tasks.Task.<>c__DisplayClass7.<ExecuteSelfReplicating>b__6(Object )<---

---> (Inner Exception #1) System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at System.Collections.Generic.List`1.Add(T item)
   at WFM.Newsletter.Business.CORE.OptimizationEngine`2.<>c__DisplayClassd.<Start>b__4(Subscriber subscriber, ParallelLoopState loopState, ContentSendLocalStorage`2 localStorage)
   at System.Threading.Tasks.Parallel.<>c__DisplayClass21`2.<ForEachWorker>b__1a(Int32 i, ParallelLoopState state, TLocal local)
   at System.Threading.Tasks.Parallel.<>c__DisplayClassf`1.<ForWorker>b__c()
   at System.Threading.Tasks.Task.InnerInvoke()
   at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
   at System.Threading.Tasks.Task.<>c__DisplayClass7.<ExecuteSelfReplicating>b__6(Object )<---

---> (Inner Exception #2) System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at System.Collections.Generic.List`1.Add(T item)
   at WFM.Newsletter.Business.CORE.OptimizationEngine`2.<>c__DisplayClassd.<Start>b__4(Subscriber subscriber, ParallelLoopState loopState, ContentSendLocalStorage`2 localStorage)
   at System.Threading.Tasks.Parallel.<>c__DisplayClass21`2.<ForEachWorker>b__1a(Int32 i, ParallelLoopState state, TLocal local)
   at System.Threading.Tasks.Parallel.<>c__DisplayClassf`1.<ForWorker>b__c()
   at System.Threading.Tasks.Task.InnerInvoke()
   at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
   at System.Threading.Tasks.Task.<>c__DisplayClass7.<ExecuteSelfReplicating>b__6(Object )<---

System.AggregateException:发生一个或多个错误。-->System.IndexOutOfRangeException:索引超出了数组的边界。
at System.Collections.Generic.List`1.Add（T项）
在WFM.Newsletter.Business.CORE.OptimizationEngine`2.c_uuDisplayClassD.b_uu4（订户订户订户、ParallelLoopState loopState、ContentSendLocalStorage`2 localStorage）
在System.Threading.Tasks.Parallel.c__;u DisplayClass21`2.b__;1a（Int32 i，ParallelLoopState状态，TLocal local local）
at System.Threading.Tasks.Parallel.c__;u DisplayClassf`1.b__;u c（）
在System.Threading.Tasks.Task.InnerInvoke（）中
位于System.Threading.Tasks.Task.InnerInvokeWitchArg（任务子任务）
在System.Threading.Tasks.Task.c\u显示器上显示Class7.b\u 6（对象）
---内部异常堆栈跟踪的结束---
位于System.Threading.Tasks.Task.ThrowifeException（布尔值IncludeTaskCanceledException）
在System.Threading.Tasks.Task.Wait（Int32毫秒计时，CancellationToken CancellationToken）
在System.Threading.Tasks.Parallel.ForWorker[TLocal]（Int32 fromInclusive，Int32 toExclusive，ParallelOptions ParallelOptions，Action`1 body，Action`2 bodyWithState，Func`4 bodyWithLocal，Func`1 localInit，Action`1 localFinally）
在System.Threading.Tasks.Parallel.ForEachWorker[TSource，TLocal]（TSource[]数组，ParallelOptions ParallelOptions，Action`1 body，Action`2 bodyWithState，Action`3 bodyWithStateAndIndex，Func`4 bodyWithStateAndLocal，Func`5 bodyWithEverything，Func`1 localInit，Action`1 localFinally）
在System.Threading.Tasks.Parallel.ForEachWorker[TSource，TLocal]（IEnumerable`1 source，ParallelOptions ParallelOptions，Action`1 body，Action`2 bodyWithState，Action`3 bodyWithStateAndIndex，Func`4 bodyWithStateAndLocal，Func`5 bodyWithEverything，Func`1 localInit，Action`1 localFinally）
在System.Threading.Tasks.Parallel.ForEach[TSource，TLocal]（IEnumerable`1 source，ParallelOptions，Func`1 localInit，Func`4 body，Action`1 localFinally）
在WFM.Newsletter.Business.CORE.OptimizationEngine`2.Start（）上
在WFM.Newsletter.Business.CORE.OptimizationService.Start（IEnumerable`1订户、IEnumerable`1新闻稿、LookupList LookupList、LocalConfig配置、ILogging logService、Int32 maxNumberOfThreads、字符串订阅服务器ClicksSourceTableName）
--->（内部异常#0）System.IndexOutOfRangeException:索引超出了数组的边界。
at System.Collections.Generic.List`1.Add（T项）
在WFM.Newsletter.Business.CORE.OptimizationEngine`2.c_uuDisplayClassD.b_uu4（订户订户订户、ParallelLoopState loopState、ContentSendLocalStorage`2 localStorage）
在System.Threading.Tasks.Parallel.c__;u DisplayClass21`2.b__;1a（Int32 i，ParallelLoopState状态，TLocal local local）
at System.Threading.Tasks.Parallel.c__;u DisplayClassf`1.b__;u c（）
在System.Threading.Tasks.Task.InnerInvoke（）中
位于System.Threading.Tasks.Task.InnerInvokeWitchArg（任务子任务）
在System.Threading.Tasks.Task.c_DisplayClass7.b__6（对象）（内部异常#1）System.IndexOutOfRangeException:索引超出了数组的边界。
at System.Collections.Generic.List`1.Add（T项）
在WFM.Newsletter.Business.CORE.OptimizationEngine`2.c_uuDisplayClassD.b_uu4（订户订户订户、ParallelLoopState loopState、ContentSendLocalStorage`2 localStorage）
在System.Threading.Tasks.Parallel.c__;u DisplayClass21`2.b__;1a（Int32 i，ParallelLoopState状态，TLocal local local）
at System.Threading.Tasks.Parallel.c__;u DisplayClassf`1.b__;u c（）
在System.Threading.Tasks.Task.InnerInvoke（）中
位于System.Threading.Tasks.Task.InnerInvokeWitchArg（任务子任务）
在System.Threading.Tasks.Task.c_DisplayClass7.b__6（对象）（内部异常#2）System.IndexOutOfRangeException:索引超出了数组的边界。
at System.Collections.Generic.List`1.Add（T项）
在WFM.Newsletter.Business.CORE.OptimizationEngine`2.c_uuDisplayClassD.b_uu4（订户订户订户、ParallelLoopState loopState、ContentSendLocalStorage`2 localStorage）
在System.Threading.Tasks.Parallel.c__DisplayClass21`2.b__1a（Int32 i，ParallelLoopState，TLocal loc
if (best != null)
    sendsToday.Add(best);
}

var sendsToday = new ConcurrentBag<TSend>();

sendsToday.Add(best);

 if (best != null)
        sendsToday.Add(best);

if (best != null)
localStorage.SubscriberSends.Add(best);