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執行時間:{0} 毫秒\r\n-->ScalarExecuted.Command:{1}\r\n", _stopwatch.ElapsedMilliseconds, command.CommandText);
}
base.ScalarExecuted(command, interceptionContext);
}

一處地方，幾句代碼搞定。