我有一个以 nHibernate 作为 ORM 的 ASP.NET MVC 应用程序（使用 SQL Server 作为数据库）。
每 5-6 个请求，就会抛出一个异常，其中包含上面标题中描述的随机错误。
这仅发生在GET请求上，并开始于：
错误在准备 SELECT ..
自从我将 NHibernate 4.x 升级到 NHibernate 5.0.3（现在是 5.1.1）后，这些问题就开始了。在此过程中，我还更新了目标框架，以前是 .NET 4.5.2 现在是 .NET 4.7.2。
我已经检查了所有内容，确保数据库没有任何连接泄漏或超时，但错误仍然存在。尝试从连接字符串中关闭“TransparentNetworkIPResolution”和“Enlist”功能 - 问题仍然存在。
任何关于解决问题的想法都将受到欢迎。
这是以下异常 (DepartmentService:838) 的罪魁祸首：
var department = _departmentRepository.Get(departmentId);
场景如下，我有多个网格，因此多个请求被触发到同一个动作。同一页面的每 5-6 次刷新，许多请求中的一个会失败（失败的一个请求是随机的，即有时是第 1 个，有时是第 2 个，依此类推）。
这是我的日志中的完整异常片段：
2020-06-26 13:25:16,297 [50] 错误 NHibernate.Util.ADOExceptionReporter [（null）] - 在准备 SELECT department0_.DepartmentId as departmentid1_22_0_，department0_.CreatedAt as createdat4_22_0_，department0_.ModifiedAt as modifiedat5_22_0_，department0_.Name as name2_22_0_, department0_.Status as status6_22_0_, department0_.CreatedBy as createdby7_22_0_, department0_.ModifiedBy as modifiedby8_22_0_, department0_.SiteId as siteid3_22_0_ FROM dbo.Departments department0_ WHERE department0_.DepartmentId=@p0 发生错误 2020-06-26 13:25: [50] 错误 NHibernate.Util.ADOExceptionReporter [(null)] - 请求的操作无法完成，因为连接已断开。
2020-06-26 13:25:16,300 [50] 错误 [（null）] - NHibernate.ADOException：在准备 SELECT department0_.DepartmentId as departmentid1_22_0_，department0_.CreatedAt as createdat4_22_0_，department0_.ModifiedAt as modifiedat5_22_0_，department0_.Name as name2_22_0_ ，department0_.Status as status6_22_0_，department0_.CreatedBy as createdby7_22_0_，department0_.ModifiedBy as modifiedby8_22_0_，department0_.SiteId as siteid3_22_0_ FROM dbo.Departments department0_ WHERE department0_.DepartmentId=@p0 发生错误---> System.InvalidOperationException：请求的操作无法完成，因为连接已断开。
在 System.Data.SqlClient.SqlInternalConnectionTds.ExecuteTransaction(TransactionRequest transactionRequest, 字符串名称, IsolationLevel iso, SqlInternalTransaction internalTransaction, Boolean isDelegateControlRequest)
在 System.Data.SqlClient.SqlDelegatedTransaction.Initialize()
在 System.Transactions.TransactionStatePSPEOperation.PSPEInitialize(InternalTransaction tx, IPromotableSinglePhaseNotification promotableSinglePhaseNotification，Guid 启动器类型）
在 System.Transactions.TransactionStateActive.EnlistPromotableSinglePhase（InternalTransaction tx，IPromotableSinglePhaseNotification promotableSinglePhaseNotification，事务 atomicTransaction，Guid 启动器类型）
在 System.Transactions.Transaction.EnlistPromotableSinglePhase(IPromotableSinglePhaseNotification promotableSinglePhaseNotification,
GuidpromotableType)
在 System.Data.SqlClient.SqlInternalConnection.EnlistNonNull(Transaction tx)
在 System.Data.SqlClient.
在 System.Data.ProviderBase.DbConnectionPool.PrepareConnection 的 System.Data.ProviderBase.DbConnectionInternal.ActivateConnection(Transaction transaction)中登记（Transaction tx）
（DbConnection owningObject，DbConnectionInternal obj，Transaction 交易）
在 System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
在 System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource1 重试, DbConnectionOptions userOptions,
System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource1 retry, DbConnectionOptions userOptions) at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource1 retry)
在 System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)在 System.Data.SqlClient 的DbConnectionInternal oldConnection, DbConnectionInternal& 连接)
。 SqlConnection.Open()
在 NHibernate.Connection.DriverConnectionProvider.GetConnection()
在 NHibernate.AdoNet.ConnectionManager.GetConnection()
在 NHibernate.AdoNet.AbstractBatcher.Prepare(DbCommand cmd)
--- 内部异常堆栈跟踪结束---在 NHibernate.AdoNet.AbstractBatcher.Prepare(DbCommand cmd)
在 NHibernate.AdoNet.AbstractBatcher.ExecuteReader(DbCommand cmd)
在 NHibernate.Loader.Loader.GetResultSet(DbCommand st, QueryParameters queryParameters, ISessionImplementor session, IResultTransformer forceResultTransformer)
在 NHibernate.Loader。 Loader.DoQuery(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies, IResultTransformerforcedResultTransformer)
在NHibernate.Loader.Loader.DoQueryAndInitializeNonLazyCollections(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies, IResultTransformerforcedResultTransformer) 在 NHibernate.Loader.Loader.LoadEntity(ISessionImplementor session, Object id, IType identifierType, Object optionalObject, String optionalEntityName, Object optionalIdentifier, IEntityPersister 持久化器) 在 NHibernate.Loader.Entity.AbstractEntityLoader.Load(Object id, Object optionalObject, ISessionImplementor session) 在 NHibernate.Persister.Entity 的 NHibernate.Loader.Entity.AbstractEntityLoader.Load(ISessionImplementor session, Object id, Object optionalObject, Object optionalId) NHibernate.Event.Default.DefaultLoadEventListener 中的 .AbstractEntityPersister.Load(Object id, Object optionalObject, LockMode lockMode, ISessionImplementor session)。NHibernate.Event.Default.DefaultLoadEventListener.DoLoad（LoadEvent 事件，IEntityPersister 持久性，EntityKey keyToLoad，LoadType 选项）在 NHibernate.Event.Default.DefaultLoadEventListener.Load（LoadEvent 事件）的 LoadFromDatasource（LoadEvent 事件，IEntityPersister 持久性，EntityKey keyToLoad，LoadType 选项） , IEntityPersister 持久性, EntityKey keyToLoad, LoadType 选项) 在 NHibernate.Event.Default.DefaultLoadEventListener.ProxyOrLoad(LoadEvent 事件, IEntityPersister 持久性, EntityKey keyToLoad, LoadType 选项) 在 NHibernate.Event.Default.DefaultLoadEventListener.OnLoad(LoadEvent 事件, LoadType loadType)在 NHibernate.Impl.SessionImpl.FireLoad(LoadEvent event, LoadType loadType) 在 NHibernate.Impl.SessionImpl.Get(String entityName, Object id) 在 NHibernate.Impl.SessionImpl.Get[T](Object id) 在 Codera.Data。休眠。NH存储库1.Get(Object id) at Castle.Proxies.Invocations.NHRepository1_Get_10.InvokeMethodOnTarget() at Castle.DynamicProxy.AbstractInvocation.Proceed() at ISOQuest.Data.NHibernate.Interceptors.MethodInterceptor.Intercept(IInvocation invocation) 在 C:\Projects\ISOQuestGen6\ISOQuest.Data.NHibernate\Interceptors\MethodInterceptor.cs : 第 49 行 Castle.DynamicProxy.AbstractInvocation.Proceed() at Castle.Proxies.DepartmentRepositoryProxy.Get(Object id) at ISOQuest.Business.Services.DepartmentService.GetDepartmentAdministrators(Guid departmentId, Int32 type) in C:\Projects\ISOQuestGen6\ Modules\ISOQuest\ISOQuest.Business\Services\Department\DepartmentService.cs：第 838 行，位于 C:\Projects\ISOQuestGen6\Modules\ISOQuest\ISOQuest 中 ISOQuest.Web.Controllers.Api.DepartmentsController.LoadDepartmentAdministrators（Guid 部门 ID，Int32 类型） .Web\Controllers\Api\DepartmentsController.cs：lambda_method 处的第 454 行（闭包，ControllerBase , Object[] ) 在 System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary2 parameters) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary2 个参数）在 System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult 的 System.Web.Mvc.Async.AsyncControllerActionInvoker.b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState)2.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) at System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) 在 System.Web.Mvc.Controller。 System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) 在 System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) at System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) 在 System.Web.HttpApplication.CallHandlerExecutionStep.System.Web的 EndExecuteCore(IAsyncResult asyncResult) .HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)