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Asynchronous Performance Question
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BillG View Drop Down
DevForce MVP
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Joined: 05-Dec-2007
Location: Monroe, MI
Posts: 233 		Post Options Post Options   Quote BillG Quote  Post ReplyReply Direct Link To This Post Topic: Asynchronous Performance Question
    Posted: 19-Nov-2010 at 10:07am
Is there any difference, performance wise between using lambda expressions to perform the callback in the Get data method versus an actual callback method being used?
 
Bill
 
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DenisK View Drop Down
IdeaBlade
IdeaBlade


Joined: 25-Aug-2010
Posts: 715 		Post Options Post Options   Quote DenisK Quote  Post ReplyReply Direct Link To This Post Posted: 19-Nov-2010 at 5:23pm
Hi Bill;

I used the following code to time it out.

public void TimingLambdaExpressionVsCallback() {

      _lambdaStopwatch.Start();
      var lambdaQuery = _mgr.Employees;
      lambdaQuery.ExecuteAsync(e => {
        var employees1 = new ObservableCollection<Employee>();
        e.Results.ForEach(employees1.Add);
        _lambdaStopwatch.Stop();
        Output += "_lambdaStopwatch = " + _lambdaStopwatch.ElapsedMilliseconds + Environment.NewLine;
      });

      _callbackStopwatch.Start();
      var callbackQuery = _mgr.Employees.ExecuteAsync();
      callbackQuery.Completed += callbackQuery_Completed;
    }

    void callbackQuery_Completed(object sender, EntityQueriedEventArgs<Employee> e) {
      var employees2 = new ObservableCollection<Employee>();
      e.Results.ForEach(employees2.Add);
      _callbackStopwatch.Stop();
      Output += "_callbackStopwatch = " + _callbackStopwatch.ElapsedMilliseconds + Environment.NewLine;
    }

_lambdaStopwatch would take between 3ms and 23ms longer than _callbackStopwatch.
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