Parallel.Foreach 给出错误“索引超出了数组的范围”

Posted 2023-05-07

【中文标题】Parallel.Foreach 给出错误“索引超出了数组的范围”

【英文标题】：Parallel.Foreach giving error " Index was outside the bounds of the array "

【发布时间】：2013-12-13 07:09:55

【问题描述】：

我在 parallel.foreach 中遇到了一些问题，即“索引超出了数组的范围”。我正在为 parallel.foreach 附加一些代码以及它崩溃的地方。

 var lstFRItems = session.CreateCriteria<TFRItem>().Add(Restrictions.Eq("TSCEnterprise.FEnterpriseID", EnterpriseId)).AddOrder(Order.Asc("FName")).List<TFRItem>();
                    List<FRItemAccount> lstItemAccount = new List<FRItemAccount>();
                    var ListAccounts = session.CreateCriteria<TFRItemAccount>().List<TFRItemAccount>();   //lstFRItems.Select(i => new   i.TFRItemAccounts ).ToList();
                    //foreach (var item in lstFRItems)
                Parallel.ForEach(lstFRItems, item =>
                 
                     var lstItemAcc = ListAccounts.Where(i => i.TFRItem == item); //item.TFRItemAccounts.ToList();
                     FRItemAccount account = new FRItemAccount();
                     account.ItemID = item.FItemID;
                     account.ItemAccount = new List<ItemAccount>();
                   //  foreach (var itemAcct in lstItemAcc)
                    Parallel.ForEach(lstItemAcc, itemAcct =>
                     
                         ItemAccount oItemAccount = new ItemAccount();
                         if (itemAcct != null)
                         
                             oItemAccount.ItemAccountID = itemAcct.FItemAccountID;

                             if (itemAcct.TSCProperty == null)
                             
                                 oItemAccount.ForID = itemAcct.TSCCompany.FCompanyID;
                                 oItemAccount.ForCompanyName = "Co#  " + "- " + itemAcct.TSCCompany.FID + " " + itemAcct.TSCCompany.FName;
                                 oItemAccount.FID = itemAcct.TSCCompany.FID;
                                 oItemAccount.ForType = 1;
                             
                             else
                             
                                 oItemAccount.ForID = itemAcct.TSCProperty.FPropertyID;
                                 oItemAccount.ForCompanyName = "Prop#  " + "- " + itemAcct.TSCProperty.FID + " " + itemAcct.TSCProperty.FName;
                                 oItemAccount.FID = itemAcct.TSCProperty.FID;
                                 oItemAccount.ForType = 2;
                             
                             oItemAccount.Account = itemAcct.FAccount;
                             account.GLAccount = itemAcct.FAccount.ToString("#0.000"); //Formatted by Lhore Bansal
                            // account.Account = itemAcct.FAccount;
                             oItemAccount.isExisting = true;
                             //Original TFRItemAccount
                             oItemAccount.orgItemAccount = itemAcct;
                         
                         if (lstItemAcc == null)
                             account.ItemID = item.FItemID;
                         account.ItemAccount.Add(oItemAccount);
                     );
                     //Original tFRItem
                     account.Item = item;
                     //account.BaseAccount = Convert.ToDouble(item.FBaseAccount.ToString("F0")); // commented by jeet
                     account.BaseAccount = Convert.ToDouble((int)item.FBaseAccount); // added by jeet
                     account.Name = item.FName;
                     account.Type = item.FType;
                     lstItemAccount.Add(account);
                 );
                  //  tx.Commit();
                    return Item = lstItemAccount;

它在倒数第三行“lstItemAccount.Add(account)”处崩溃。当我在 lstItemAccount 中看到时，它有一些计数，并且在基础部分它有一个错误 "base System.SystemException = "Source array was not long enough. Check srcIndex and length, and the array's lower bounds."".

这个错误的解决方法是什么？

【问题讨论】：

仅供参考 - 您可能遇到lstItemAccount 的线程问题。

你得到这个问题的有效答案了吗？

【参考方案1】：

我会使用ConcurrentBag<T> 而不是List<T>。 List<T> 是专为一个线程的访问而设计的。

【参考方案2】：

这有关系

ListAccounts.Where(i => i.TFRItem == item);
account.ItemAccount.Add(oItemAccount); 
lstItemAccount.Add(account);

列表和数组不是线程安全的。请改用ConcurrentBag