skCompletionSource`1retry,DbConnectionOptionsuserOptions,DbConnectionInternaloldConnection,DbConnectionInternal&amp;connection)+941<br><br>System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnectionouterConnection,DbConnectionFactoryconnectionFactory,TaskCompletionSource`1retry,DbConnectionOptionsuserOptions)+143<br><br>System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnectionouterConnection,DbConnectionFactoryconnectionFactory,TaskCompletionSource`1retry,DbConnectionOptionsuserOptions)+17<br><br>System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1retry)+139<br><br>System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1retry)+448<br><br>System.Data.SqlClient.SqlConnection.Open()+130<br><br>NewFolder1.Class1.user(Stringipkey,Stringrz,Int32cl)+154<br><br>WebApplication1.api.ProcessRequest(HttpContextcontext)+499<br><br>System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()+814<br><br>System.Web.HttpApplication.ExecuteStepImpl(IExecutionStepstep)+132<br><br>System.Web.HttpApplication.ExecuteStep(IExecutionStepstep,Boolean&amp;completedSynchronously)+73<br><br>版本信息:Microsoft.NETFramework版本:4.0.30319;ASP.NET版本:4.8.4110.0>> --