DevForce Community Forum : Question abour results from coroutine

Question abour results from coroutine : When the Coroutine.Return occurs,...

Tue, 07 Dec 2010 07:42:48 -700

Author: BillG
Subject: 2348
Posted: 07-Dec-2010 at 7:42am

When the Coroutine.Return occurs, the data type is

System.Collections.ObjectModel.ReadOnlyCollecton Results count = 26

in my Args.CompletedSuccessfully code, I do a GetType() and the data type is

IdeaBlade.EntityModel.EntityQueryOperations

so what do I need to cast it to in order to get it into my ObservableCollection

var results = steps.Result as ?????????????????

ResetStepTypesList(results)

public ResetStepTypeList( stepsTypes)

{

this.StepTypes.Clear();

stepTypes.foreach(StepTypes.Add);

}

Question abour results from coroutine : Strange. When I check the following...

Mon, 06 Dec 2010 14:47:16 -700

Author: BillG
Subject: 2348
Posted: 06-Dec-2010 at 2:47pm

Strange. When I check the following line.

var Results = steps.Result as ObservableCollection<EventStepType>;

Steps.results = 25 and they are of type EventStepType

but Results = null after the line is executed.

Question abour results from coroutine : Try a steps.Result.GetType() to...

Mon, 06 Dec 2010 11:22:08 -700

Author: kimj
Subject: 2348
Posted: 06-Dec-2010 at 11:22am

Try a steps.Result.GetType() to see the actual type in the IEnumerable. You could also try the cast before calling the method and test it explicitly:

var myResult = steps.Result as IEnumerable<EventStepType>;

if (myResult == null) { ...casting issue }

Question abour results from coroutine : If I set a breakpoint at the call...

Mon, 06 Dec 2010 11:17:33 -700

Author: BillG
Subject: 2348
Posted: 06-Dec-2010 at 11:17am

If I set a breakpoint at the call to ResetEventTyepsList method call I can see a 25 for the number in Reulsts. So If I cast steps.Result to ObservableCollection does tat access the Results value?

Question abour results from coroutine : I'll have to guess here,...

Mon, 06 Dec 2010 10:44:59 -700

Author: kimj
Subject: 2348
Posted: 06-Dec-2010 at 10:44am

I'll have to guess here, since I can't reproduce the problem, but it's likely an issue with the cast in the call to ResetStepTypesList. If the result isn't truly an IEnumerable the as operator will return a null, and that null would be passed to the function.

Question abour results from coroutine : I created my coroutine and my...

Sat, 04 Dec 2010 22:56:56 -700

Author: BillG
Subject: 2348
Posted: 04-Dec-2010 at 10:56pm

I created my coroutine and my iterator. I have my yield returns after every asynchronous query and I have my yield return corroutine at the end of the iterator method.

Here is my problem. When the args.CompletedSuccessfully is reached there are 25 rows of the entity type I am returning. Here is my code. When the ResetStepTypesList is reached the variable is null. what am I doing wrong in the parameter to ResetStepTypesList method?

public void GetAvailableSteps()

{

var steps = Coroutine.Start(() => AvailableStepsSelector.RetrieveAvailableSteps(currentEvent));

steps.Completed += (sender, args) =>{

if (args.CompletedSuccessfully){

ResetStepTypesList(steps.Result as IEnumerable<EventStepType>); //Results = 25 rows

}

else{

}

};

}

public void ResetStepTypesList(IEnumerable<EventStepType> stepTypes) steps == null at this point

{

StepTypes.Clear();

stepTypes.ForEach(StepTypes.Add);

OnPropertyChanged("StepTypes");

}