class EFIntercepterLogging : DbCommandInterceptor
    {
        private readonly Stopwatch _stopwatch = new Stopwatch();
        public override void ScalarExecuting(System.Data.Common.DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
        {
            base.ScalarExecuting(command, interceptionContext);
            _stopwatch.Restart();
        }
        public override void ScalarExecuted(System.Data.Common.DbCommand command, DbCommandInterceptionContext<object> interceptionContext)
        {
            _stopwatch.Stop();
            if (interceptionContext.Exception != null)
            {
                Trace.TraceError("Exception:{1} \r\n --> Error executing command: {0}", command.CommandText, interceptionContext.Exception.ToString());
            }
            else
            {
                Trace.TraceInformation("\r\n执行时间:{0} 毫秒\r\n-->ScalarExecuted.Command:{1}\r\n", _stopwatch.ElapsedMilliseconds, command.CommandText);
            }
            base.ScalarExecuted(command, interceptionContext);
        }
        public override void NonQueryExecuting(System.Data.Common.DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
        {
            base.NonQueryExecuting(command, interceptionContext);
            _stopwatch.Restart();
        }
        public override void NonQueryExecuted(System.Data.Common.DbCommand command, DbCommandInterceptionContext<int> interceptionContext)
        {
            _stopwatch.Stop();
            if (interceptionContext.Exception != null)
            {
                Trace.TraceError("Exception:{1} \r\n --> Error executing command:\r\n {0}", command.CommandText, interceptionContext.Exception.ToString());
            }
            else
            {
                Trace.TraceInformation("\r\n执行时间:{0} 毫秒\r\n-->NonQueryExecuted.Command:\r\n{1}", _stopwatch.ElapsedMilliseconds, command.CommandText);
            }
            base.NonQueryExecuted(command, interceptionContext);
        }
        public override void ReaderExecuting(System.Data.Common.DbCommand command, DbCommandInterceptionContext<System.Data.Common.DbDataReader> interceptionContext)
        {
            base.ReaderExecuting(command, interceptionContext);
            _stopwatch.Restart();
        }
        public override void ReaderExecuted(System.Data.Common.DbCommand command, DbCommandInterceptionContext<System.Data.Common.DbDataReader> interceptionContext)
        {
            _stopwatch.Stop();
            if (interceptionContext.Exception != null)
            {
                Trace.TraceError("Exception:{1} \r\n --> Error executing command:\r\n {0}", command.CommandText, interceptionContext.Exception.ToString());
            }
            else
            {
                Trace.TraceInformation("\r\n执行时间:{0} 毫秒 \r\n -->ReaderExecuted.Command:\r\n{1}", _stopwatch.ElapsedMilliseconds, command.CommandText);
            }
            base.ReaderExecuted(command, interceptionContext);
        }
    }