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  • Asp.net 超时已过期。从池中获取连接之前经过的超时时间。企业图书馆

Asp.net 超时已过期。从池中获取连接之前经过的超时时间。企业图书馆

asp.net wcf

Asp.net 超时已过期。从池中获取连接之前经过的超时时间。企业图书馆,asp.net,wcf,timeout,connection-pooling,enterprise-library,Asp.net,Wcf,Timeout,Connection Pooling,Enterprise Library,我的ASP.NET 4.0生产应用程序遇到重复出现的问题，这些问题导致站点由于超时错误而失去响应 下面是该应用程序的简要概述。应用程序驻留在3台服务器上；运行SQL server 2008的web服务器、应用程序服务器和数据库服务器。所有服务器都在Windows Server 2008上运行。web服务器位于公共域中。应用服务器驻留在DMZ中，Web服务器之间通过WCF通过端口80和443进行开放通信。DB服务器位于私有域中，通过端口1433与应用服务器进行开放通信。该应用程序已经投入生产一段时

我的ASP.NET 4.0生产应用程序遇到重复出现的问题，这些问题导致站点由于超时错误而失去响应

下面是该应用程序的简要概述。应用程序驻留在3台服务器上；运行SQL server 2008的web服务器、应用程序服务器和数据库服务器。所有服务器都在Windows Server 2008上运行。web服务器位于公共域中。应用服务器驻留在DMZ中，Web服务器之间通过WCF通过端口80和443进行开放通信。DB服务器位于私有域中，通过端口1433与应用服务器进行开放通信。该应用程序已经投入生产一段时间了，直到上周才经常遇到这些问题。没有代码更改，托管提供商表示最近没有对服务器进行任何更改

在web服务器上，应用程序遇到下面发布的错误（错误1）。快速修复解决方案是重新启动app server IIS进程，但是，这是一个反复出现的问题，会对业务所有者造成重大中断

应用程序的DAL使用企业库v4.1打开到数据库的连接。我已经包含了两段负责启动调用的代码（代码1和代码2）。此方法在其他各种方法中重复。ExecuteReader方法是否可能未正确关闭连接？没有重写允许我指定ConnectionBehavior来关闭连接的方法

我们执行了SQL概要文件分析，并确定没有到DB的延迟打开连接

在研究这个问题时，有人建议企业库可能有一个错误，连接没有被正确处理，但是这并没有在文章中得到验证。如何确定问题的原因？或者采取什么适当的行动来解决问题？我可以增加池大小，但这似乎只是一个临时解决方案

错误1:

***System.ServiceModel.FaultException: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached. at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetNewOpenConnection() at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetOpenConnection(Boolean disposeInnerConnection) at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(DbCommand command) at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(String storedProcedureName, Object[] parameterValues) at CityStoreDAL.NavigationProvider.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreDAL\NavigationProvider.cs:line 41 at CityStoreBLL.Navigation.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreBLL\Navigation.cs:line 15 at CityStoreService.CityStoreService.GetNavigator(Int32 navigato rID) in c:\TFS\CityStore\DEV\SRC\CityStoreService\Navigation.cs:line 21 at SyncInvokeGetNavigator(Object , Object[] , Object[] ) at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs) at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)***
Generated: Wed, 12 Nov 2014 19:40:22 GMT

System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.ServiceModel.FaultException: Timeout expired.  The timeout period elapsed prior to obtaining a connection from the pool.  This may have occurred because all pooled connections were in use and max pool size was reached.   at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)
   at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
   at System.Data.SqlClient.SqlConnection.Open()
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetNewOpenConnection()
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetOpenConnection(Boolean disposeInnerConnection)
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(DbCommand command)
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(String storedProcedureName, Object[] parameterValues)
   at CityStoreDAL.NavigationProvider.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreDAL\NavigationProvider.cs:line 41
   at CityStoreBLL.Navigation.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreBLL\Navigation.cs:line 15
   at CityStoreService.CityStoreService.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreService\Navigation.cs:line 21
   at SyncInvokeGetNavigator(Object , Object[] , Object[] )
   at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)

Server stack trace: 
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at CityStoreWeb.CityStoreServiceReference.INavigation.GetNavigator(Int32 navigatorID)
   at CityStoreWeb.Product.<>c__DisplayClass1.<BindCategoryMenuAndInfo>b__0(INavigation proxy) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 73
   at CityStoreWeb.Common.Service'1.Use(UseServiceDelegate'1 codeBlock) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Common\Utils.cs:line 243
   at CityStoreWeb.Product.BindCategoryMenuAndInfo(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 71
   at CityStoreWeb.Product.SetupPage(Int32 navigatorID, Int32 categoryID, Int32 productID) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 64
   at CityStoreWeb.Product.Page_Load(Object sender, EventArgs e) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 37
   at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
   at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
   at System.Web.UI.Control.OnLoad(EventArgs e)
   at CityStoreWeb.Common.BasePage.OnLoad(EventArgs e) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Common\BasePage.cs:line 26
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   --- End of inner exception stack trace ---
   at System.Web.UI.Page.HandleError(Exception e)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest()
   at System.Web.UI.Page.ProcessRequest(HttpContext context)
   at ASP.product_aspx.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

public static NavigatorEntity GetNavigator(int navigatorID)
{
        Database db = DatabaseFactory.CreateDatabase();
        object[] spParams;
        spParams = new object[1];
        spParams[0] = navigatorID;
        using (IDataReader reader = db.ExecuteReader("GetNavigator", spParams))
        {
            if (reader == null)k
            {
                throw new ArgumentNullException("reader");
            }
            NavigatorEntity myNav = null;
            if (reader.Read())
            {
                myNav = GetNavigatorEntityFromReader(reader);
            }

            if (myNav != null)
            {
                reader.NextResult();
                myNav.Categories = GetCategoriesCollectionFromReader(reader);

                reader.NextResult();
                myNav.RecommendedProducts = 
                    ProductProvider.GetRecommendedProductCollectionFromReader(reader, false);
            }

            return myNav;
        }
    }

public static List<NavigatorEntity> GetNavigatorsAll()
{
    Database db = DatabaseFactory.CreateDatabase();

    using (IDataReader myReader = db.ExecuteReader("GetNavigatorsAll"))
    {
        return GetNavigatorCollectionFromReader(myReader);
    }
}

private static List<NavigatorEntity> GetNavigatorCollectionFromReader(IDataReader reader)
{
    List<NavigatorEntity> navigators = new List<NavigatorEntity>();
    while (reader.Read())
    {
        navigators.Add(GetNavigatorEntityFromReader(reader));
    }
    return navigators;
}

public static List<TaxCodeEntity> CMSGetTaxCodes()
{
    Database db = DatabaseFactory.CreateDatabase();
    return GetTaxCodeCollectionFromReader(db.ExecuteReader("CMS_GetTaxCodes"));            
}
代码2:

***System.ServiceModel.FaultException: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached. at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetNewOpenConnection() at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetOpenConnection(Boolean disposeInnerConnection) at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(DbCommand command) at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(String storedProcedureName, Object[] parameterValues) at CityStoreDAL.NavigationProvider.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreDAL\NavigationProvider.cs:line 41 at CityStoreBLL.Navigation.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreBLL\Navigation.cs:line 15 at CityStoreService.CityStoreService.GetNavigator(Int32 navigato rID) in c:\TFS\CityStore\DEV\SRC\CityStoreService\Navigation.cs:line 21 at SyncInvokeGetNavigator(Object , Object[] , Object[] ) at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs) at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)***
Generated: Wed, 12 Nov 2014 19:40:22 GMT

System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.ServiceModel.FaultException: Timeout expired.  The timeout period elapsed prior to obtaining a connection from the pool.  This may have occurred because all pooled connections were in use and max pool size was reached.   at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)
   at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
   at System.Data.SqlClient.SqlConnection.Open()
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetNewOpenConnection()
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetOpenConnection(Boolean disposeInnerConnection)
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(DbCommand command)
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(String storedProcedureName, Object[] parameterValues)
   at CityStoreDAL.NavigationProvider.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreDAL\NavigationProvider.cs:line 41
   at CityStoreBLL.Navigation.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreBLL\Navigation.cs:line 15
   at CityStoreService.CityStoreService.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreService\Navigation.cs:line 21
   at SyncInvokeGetNavigator(Object , Object[] , Object[] )
   at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)

Server stack trace: 
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at CityStoreWeb.CityStoreServiceReference.INavigation.GetNavigator(Int32 navigatorID)
   at CityStoreWeb.Product.<>c__DisplayClass1.<BindCategoryMenuAndInfo>b__0(INavigation proxy) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 73
   at CityStoreWeb.Common.Service'1.Use(UseServiceDelegate'1 codeBlock) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Common\Utils.cs:line 243
   at CityStoreWeb.Product.BindCategoryMenuAndInfo(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 71
   at CityStoreWeb.Product.SetupPage(Int32 navigatorID, Int32 categoryID, Int32 productID) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 64
   at CityStoreWeb.Product.Page_Load(Object sender, EventArgs e) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 37
   at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
   at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
   at System.Web.UI.Control.OnLoad(EventArgs e)
   at CityStoreWeb.Common.BasePage.OnLoad(EventArgs e) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Common\BasePage.cs:line 26
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   --- End of inner exception stack trace ---
   at System.Web.UI.Page.HandleError(Exception e)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest()
   at System.Web.UI.Page.ProcessRequest(HttpContext context)
   at ASP.product_aspx.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

public static NavigatorEntity GetNavigator(int navigatorID)
{
        Database db = DatabaseFactory.CreateDatabase();
        object[] spParams;
        spParams = new object[1];
        spParams[0] = navigatorID;
        using (IDataReader reader = db.ExecuteReader("GetNavigator", spParams))
        {
            if (reader == null)k
            {
                throw new ArgumentNullException("reader");
            }
            NavigatorEntity myNav = null;
            if (reader.Read())
            {
                myNav = GetNavigatorEntityFromReader(reader);
            }

            if (myNav != null)
            {
                reader.NextResult();
                myNav.Categories = GetCategoriesCollectionFromReader(reader);

                reader.NextResult();
                myNav.RecommendedProducts = 
                    ProductProvider.GetRecommendedProductCollectionFromReader(reader, false);
            }

            return myNav;
        }
    }

public static List<NavigatorEntity> GetNavigatorsAll()
{
    Database db = DatabaseFactory.CreateDatabase();

    using (IDataReader myReader = db.ExecuteReader("GetNavigatorsAll"))
    {
        return GetNavigatorCollectionFromReader(myReader);
    }
}

private static List<NavigatorEntity> GetNavigatorCollectionFromReader(IDataReader reader)
{
    List<NavigatorEntity> navigators = new List<NavigatorEntity>();
    while (reader.Read())
    {
        navigators.Add(GetNavigatorEntityFromReader(reader));
    }
    return navigators;
}

public static List<TaxCodeEntity> CMSGetTaxCodes()
{
    Database db = DatabaseFactory.CreateDatabase();
    return GetTaxCodeCollectionFromReader(db.ExecuteReader("CMS_GetTaxCodes"));            
}

公共静态列表getNavigatorAll（）
{
Database db=DatabaseFactory.CreateDatabase（）；
使用（IDataReader myReader=db.ExecuteReader（“GetNavigatorsAll”））
{
返回GetNavigatorCollectionFromReader（myReader）；
}
}
私有静态列表GetNavigatorCollectionFromReader（IDataReader阅读器）
{
列表导航器=新列表（）；
while（reader.Read（））
{
Add（GetNavigatorEntityFromReader（reader））；
}
返回导航器；
}
更新：

***System.ServiceModel.FaultException: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached. at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetNewOpenConnection() at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetOpenConnection(Boolean disposeInnerConnection) at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(DbCommand command) at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(String storedProcedureName, Object[] parameterValues) at CityStoreDAL.NavigationProvider.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreDAL\NavigationProvider.cs:line 41 at CityStoreBLL.Navigation.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreBLL\Navigation.cs:line 15 at CityStoreService.CityStoreService.GetNavigator(Int32 navigato rID) in c:\TFS\CityStore\DEV\SRC\CityStoreService\Navigation.cs:line 21 at SyncInvokeGetNavigator(Object , Object[] , Object[] ) at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs) at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)***
Generated: Wed, 12 Nov 2014 19:40:22 GMT

System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.ServiceModel.FaultException: Timeout expired.  The timeout period elapsed prior to obtaining a connection from the pool.  This may have occurred because all pooled connections were in use and max pool size was reached.   at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)
   at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
   at System.Data.SqlClient.SqlConnection.Open()
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetNewOpenConnection()
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetOpenConnection(Boolean disposeInnerConnection)
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(DbCommand command)
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(String storedProcedureName, Object[] parameterValues)
   at CityStoreDAL.NavigationProvider.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreDAL\NavigationProvider.cs:line 41
   at CityStoreBLL.Navigation.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreBLL\Navigation.cs:line 15
   at CityStoreService.CityStoreService.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreService\Navigation.cs:line 21
   at SyncInvokeGetNavigator(Object , Object[] , Object[] )
   at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)

Server stack trace: 
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at CityStoreWeb.CityStoreServiceReference.INavigation.GetNavigator(Int32 navigatorID)
   at CityStoreWeb.Product.<>c__DisplayClass1.<BindCategoryMenuAndInfo>b__0(INavigation proxy) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 73
   at CityStoreWeb.Common.Service'1.Use(UseServiceDelegate'1 codeBlock) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Common\Utils.cs:line 243
   at CityStoreWeb.Product.BindCategoryMenuAndInfo(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 71
   at CityStoreWeb.Product.SetupPage(Int32 navigatorID, Int32 categoryID, Int32 productID) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 64
   at CityStoreWeb.Product.Page_Load(Object sender, EventArgs e) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 37
   at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
   at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
   at System.Web.UI.Control.OnLoad(EventArgs e)
   at CityStoreWeb.Common.BasePage.OnLoad(EventArgs e) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Common\BasePage.cs:line 26
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   --- End of inner exception stack trace ---
   at System.Web.UI.Page.HandleError(Exception e)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest()
   at System.Web.UI.Page.ProcessRequest(HttpContext context)
   at ASP.product_aspx.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

public static NavigatorEntity GetNavigator(int navigatorID)
{
        Database db = DatabaseFactory.CreateDatabase();
        object[] spParams;
        spParams = new object[1];
        spParams[0] = navigatorID;
        using (IDataReader reader = db.ExecuteReader("GetNavigator", spParams))
        {
            if (reader == null)k
            {
                throw new ArgumentNullException("reader");
            }
            NavigatorEntity myNav = null;
            if (reader.Read())
            {
                myNav = GetNavigatorEntityFromReader(reader);
            }

            if (myNav != null)
            {
                reader.NextResult();
                myNav.Categories = GetCategoriesCollectionFromReader(reader);

                reader.NextResult();
                myNav.RecommendedProducts = 
                    ProductProvider.GetRecommendedProductCollectionFromReader(reader, false);
            }

            return myNav;
        }
    }

public static List<NavigatorEntity> GetNavigatorsAll()
{
    Database db = DatabaseFactory.CreateDatabase();

    using (IDataReader myReader = db.ExecuteReader("GetNavigatorsAll"))
    {
        return GetNavigatorCollectionFromReader(myReader);
    }
}

private static List<NavigatorEntity> GetNavigatorCollectionFromReader(IDataReader reader)
{
    List<NavigatorEntity> navigators = new List<NavigatorEntity>();
    while (reader.Read())
    {
        navigators.Add(GetNavigatorEntityFromReader(reader));
    }
    return navigators;
}

public static List<TaxCodeEntity> CMSGetTaxCodes()
{
    Database db = DatabaseFactory.CreateDatabase();
    return GetTaxCodeCollectionFromReader(db.ExecuteReader("CMS_GetTaxCodes"));            
}
显然，问题不在于ASP.NET错误中引用的任何方法。他们抛出了一个异常，因为在到达该异常时，问题（耗尽的连接池）已经发生，并且该异常将在打开新连接的任何正在进行的方法上抛出

在分析了数据访问层中的所有代码之后，我发现了一些没有适当利用using语句的rouge方法，从而使池中的开放连接不断累积。在隔离这些方法并使用性能监视器观察PooledConnections的数量之后，我确认这些方法是罪魁祸首

修复方法是将rouge方法包装在适当的using语句中

导致问题的方法之一：

***System.ServiceModel.FaultException: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached. at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetNewOpenConnection() at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetOpenConnection(Boolean disposeInnerConnection) at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(DbCommand command) at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(String storedProcedureName, Object[] parameterValues) at CityStoreDAL.NavigationProvider.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreDAL\NavigationProvider.cs:line 41 at CityStoreBLL.Navigation.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreBLL\Navigation.cs:line 15 at CityStoreService.CityStoreService.GetNavigator(Int32 navigato rID) in c:\TFS\CityStore\DEV\SRC\CityStoreService\Navigation.cs:line 21 at SyncInvokeGetNavigator(Object , Object[] , Object[] ) at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs) at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)***
Generated: Wed, 12 Nov 2014 19:40:22 GMT

System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.ServiceModel.FaultException: Timeout expired.  The timeout period elapsed prior to obtaining a connection from the pool.  This may have occurred because all pooled connections were in use and max pool size was reached.   at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)
   at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
   at System.Data.SqlClient.SqlConnection.Open()
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetNewOpenConnection()
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.GetOpenConnection(Boolean disposeInnerConnection)
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(DbCommand command)
   at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(String storedProcedureName, Object[] parameterValues)
   at CityStoreDAL.NavigationProvider.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreDAL\NavigationProvider.cs:line 41
   at CityStoreBLL.Navigation.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreBLL\Navigation.cs:line 15
   at CityStoreService.CityStoreService.GetNavigator(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreService\Navigation.cs:line 21
   at SyncInvokeGetNavigator(Object , Object[] , Object[] )
   at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)

Server stack trace: 
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at CityStoreWeb.CityStoreServiceReference.INavigation.GetNavigator(Int32 navigatorID)
   at CityStoreWeb.Product.<>c__DisplayClass1.<BindCategoryMenuAndInfo>b__0(INavigation proxy) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 73
   at CityStoreWeb.Common.Service'1.Use(UseServiceDelegate'1 codeBlock) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Common\Utils.cs:line 243
   at CityStoreWeb.Product.BindCategoryMenuAndInfo(Int32 navigatorID) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 71
   at CityStoreWeb.Product.SetupPage(Int32 navigatorID, Int32 categoryID, Int32 productID) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 64
   at CityStoreWeb.Product.Page_Load(Object sender, EventArgs e) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Product.aspx.cs:line 37
   at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
   at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
   at System.Web.UI.Control.OnLoad(EventArgs e)
   at CityStoreWeb.Common.BasePage.OnLoad(EventArgs e) in c:\TFS\CityStore\DEV\SRC\CityStoreWeb\Common\BasePage.cs:line 26
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   --- End of inner exception stack trace ---
   at System.Web.UI.Page.HandleError(Exception e)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest()
   at System.Web.UI.Page.ProcessRequest(HttpContext context)
   at ASP.product_aspx.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

public static NavigatorEntity GetNavigator(int navigatorID)
{
        Database db = DatabaseFactory.CreateDatabase();
        object[] spParams;
        spParams = new object[1];
        spParams[0] = navigatorID;
        using (IDataReader reader = db.ExecuteReader("GetNavigator", spParams))
        {
            if (reader == null)k
            {
                throw new ArgumentNullException("reader");
            }
            NavigatorEntity myNav = null;
            if (reader.Read())
            {
                myNav = GetNavigatorEntityFromReader(reader);
            }

            if (myNav != null)
            {
                reader.NextResult();
                myNav.Categories = GetCategoriesCollectionFromReader(reader);

                reader.NextResult();
                myNav.RecommendedProducts = 
                    ProductProvider.GetRecommendedProductCollectionFromReader(reader, false);
            }

            return myNav;
        }
    }

public static List<NavigatorEntity> GetNavigatorsAll()
{
    Database db = DatabaseFactory.CreateDatabase();

    using (IDataReader myReader = db.ExecuteReader("GetNavigatorsAll"))
    {
        return GetNavigatorCollectionFromReader(myReader);
    }
}

private static List<NavigatorEntity> GetNavigatorCollectionFromReader(IDataReader reader)
{
    List<NavigatorEntity> navigators = new List<NavigatorEntity>();
    while (reader.Read())
    {
        navigators.Add(GetNavigatorEntityFromReader(reader));
    }
    return navigators;
}

public static List<TaxCodeEntity> CMSGetTaxCodes()
{
    Database db = DatabaseFactory.CreateDatabase();
    return GetTaxCodeCollectionFromReader(db.ExecuteReader("CMS_GetTaxCodes"));            
}

公共静态列表CMSGetTaxCodes（）
{
Database db=DatabaseFactory.CreateDatabase（）；
从Reader返回GetTaxCodeCollectionFromReader（db.ExecuteReader（“CMS_GetTaxCodes”）；
}
修复：

public static List<TaxCodeEntity> CMSGetTaxCodes()
{
    Database db = DatabaseFactory.CreateDatabase();
    using (DbCommand dbCmd = db.GetStoredProcCommand("CMS_GetTaxCodes"))
    {
        using (IDataReader myReader = db.ExecuteReader(dbCmd))
        {
            return GetTaxCodeCollectionFromReader(myReader);
        }    
    }
}

公共静态列表CMSGetTaxCodes（）
{
Database db=DatabaseFactory.CreateDatabase（）；
使用（DbCommand dbCmd=db.GetStoredProcCommand（“CMS\u GetTaxCodes”））
{
使用（IDataReaderMyReader=db.ExecuteReader（dbCmd））
{
返回GetTaxCodeCollectionFromReader（myReader）；
}    
}
}
一旦读卡器打开，我可以看到许多动作发生。如果在依赖函数上引发任何异常，如：myNav.Categories=GetCategoriesCollectionFromReader（reader）；可以让读者保持开放。安全侧专门关闭读卡器。像这样：

    public static NavigatorEntity GetNavigator(int navigatorID)
    {
        Database db = DatabaseFactory.CreateDatabase();
        object[] spParams;
        spParams = new object[1];
        spParams[0] = navigatorID;
        using (IDataReader reader = db.ExecuteReader("GetNavigator", spParams))
        {
            try
            {
                if (reader == null)
                {
                    throw new ArgumentNullException("reader");
                }
                NavigatorEntity myNav = null;
                if (reader.Read())
                {
                    myNav = GetNavigatorEntityFromReader(reader);
                }

                if (myNav != null)
                {
                    reader.NextResult();
                    myNav.Categories = GetCategoriesCollectionFromReader(reader);

                    reader.NextResult();
                    myNav.RecommendedProducts = 
                        ProductProvider.GetRecommendedProductCollectionFromReader(reader, false);
                }

                return myNav;
            }
            catch
            {
            }
            finally
            {
                reader.Close();
            }
        }
    }
还要密切关注您的sql server：

从sys.sysprocesses中选择DB_NAME（dbid）、COUNT（dbid）、loginame，其中dbid>0
按dbid、loginame分组调试的一种方法是将性能计数器添加到跟踪/日志/异常处理中
NumberOfActiveConnectionPoolGroups
、
NumberOfActiveConnectionPools
和
NumberOfPooledConnections
可能是调试问题所需的计数器值。

Rajiv，谢谢您的回复。在我承诺在整个应用程序中进行更改之前，我想首先确认这就是问题所在。我已请求我的主机向我提供异常时池连接的当前数量以及IIS工作进程内存转储的信息。在这一点上，我甚至不确定我发布的代码是否是罪魁祸首，所以首要任务是识别问题。关于如何进行这项工作还有什么建议吗？另外，您发布的SQL命令总是为COUNT（dbid）返回1。非常感谢。