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PONInject and multi-threading issue
 

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    <p>We are using Entity framework 4 for our web application and Ninject as our DI container. We have a log table to log everything that happens in our application and also we have backend WCF workflow service which again writes log into log table.</p> <p>For all requests coming from the web we use </p> <pre><code>StandardScopeCallbacks.Request(ctx); </code></pre> <p>and for everything in the backend we use </p> <pre><code>StandardScopeCallbacks.ThreadScope(ctx); </code></pre> <p>our logging method is very simple</p> <pre><code> public void Log(string message, LogLevel level) { var log = new ApplicationLog() { LogDate = DateTime.Now, Message = message, LogLevel = Enum.GetName(typeof(LogLevel), level) }; db.ApplicationLog.Add(log); db.SaveChanges(); } </code></pre> <p>Problem : If we have more threads running then we get an exception</p> <blockquote> <p>System.Data.SqlClient.SqlException: New transaction is not allowed because there are other threads running in the session. at </p> <p>System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.TdsExecuteTransactionManagerRequest(Byte[] buffer, TransactionManagerRequestType request, String transactionName, TransactionManagerIsolationLevel isoLevel, Int32 timeout, SqlInternalTransaction transaction, TdsParserStateObject stateObj, Boolean isDelegateControlRequest) at</p> <p>System.Data.SqlClient.SqlInternalConnectionTds.ExecuteTransactionYukon(TransactionRequest transactionRequest, String transactionName, IsolationLevel iso, SqlInternalTransaction internalTransaction, Boolean isDelegateControlRequest) at </p> <p>System.Data.SqlClient.SqlInternalConnection.BeginSqlTransaction(IsolationLevel iso, String transactionName) at System.Data.SqlClient.SqlInternalConnection.BeginTransaction(IsolationLevel iso) at System.Data.SqlClient.SqlConnection.BeginDbTransaction(IsolationLevel isolationLevel) at System.Data.EntityClient.EntityConnection.BeginDbTransaction(IsolationLevel isolationLevel)</p> </blockquote> <p>I know I can create new context using "using" statement and write ti Log table without any issue. But I don't want to do this as this will make everything slower then creating Context in threadscope.</p> <p>What is the best way to handle such a scenario? I need the implementation that will have least execution time.</p> <p>Please leave a comment if you need more information. Thank you in advance.</p>
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    1. USNalaka526
    1. USpskk
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    1. COWhere does the variable db come from? Is it injected in the constructor of whatever class your Log method is residing in? And db is your EF context?
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      1. USMaarten
    2. COI hope you are well aware that EVERY major logging framework has appenders which write directly into a databse of your choice. Why do you reinvent the wheel? And also please provide more context so that we can help you
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      1. USDaniel Marbach
    3. COhave you every tried `lock(db)`{ ... } inside your `Log` method?
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