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Questions about Migration and Async
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iDave View Drop Down
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Joined: 27-Jun-2011
Location: België
Posts: 11 		Post Options Post Options   Quote iDave Quote  Post ReplyReply Direct Link To This Post Topic: Questions about Migration and Async
    Posted: 14-Jan-2013 at 6:15pm
Good day,

I've migrated from 2010 to 2012 and some code doesn't work. All of them related to async.
So, I wonder if someone could be so kind to give me a hint here.

For example:

Here's what I was doing back in 2010:


        public void GetCustomers(Action<IEnumerable<Customer>> onSuccess, Action<Exception> onFail)
        {
            Manager.Customers
              .Include(c => c.Address)
              .OrderBy(c => c.Id)
              .ExecuteAsync(
                  op =>
                  {
                      if (op.CompletedSuccessfully)
                      {
                          if (onSuccess != null) 
                              onSuccess(op.Results);
                      }
                      else
                      {
                          if (onFail != null)
                          {
                              op.MarkErrorAsHandled();
                              onFail(op.Error);
                          }
                      }
                  }
               );
        }


How should I convert it to 2012 in order to have this code working again?

Thanks in advance!
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smi-mark View Drop Down
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Joined: 24-Feb-2009
Location: Dallas, Texas
Posts: 343 		Post Options Post Options   Quote smi-mark Quote  Post ReplyReply Direct Link To This Post Posted: 14-Jan-2013 at 6:32pm
Hi,

I would suggest you read up on Tasks, it replaces coroutines. Essentially the code would look like this:


public Task<IEnumerable<Customer>> GetCustomers()
{
    return await Manager.Customers
        .Include(c => c.Address)
        .OrderBy(c => c.Id)
        .ExecuteAsync();
}

I just typed that up in notepad, so I may be slightly off. As you can see it is a lot less code.

In your VM you can then write code like this:

var customers = await Repository.GetCustomers();

you can also wrap try statements around them now, unlike coroutines. ie:

try
{
  await MyRoutine();
}
catch (MyException ex)
{
}

etc

I would strongly advise looking at the TempHire and other examples that have been updated to DF 2012




Edited by smi-mark - 14-Jan-2013 at 6:34pm
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smi-mark View Drop Down
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Joined: 24-Feb-2009
Location: Dallas, Texas
Posts: 343 		Post Options Post Options   Quote smi-mark Quote  Post ReplyReply Direct Link To This Post Posted: 14-Jan-2013 at 6:35pm
If you can't upgrade all your code right now, you can use the compatibility pack.

This link will explain it:

http://drc.ideablade.com/devforce-2012/bin/view/Documentation/cocktail-backward-compatibility
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iDave View Drop Down
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Joined: 27-Jun-2011
Location: België
Posts: 11 		Post Options Post Options   Quote iDave Quote  Post ReplyReply Direct Link To This Post Posted: 14-Jan-2013 at 6:38pm
Thank you for your lighting-fast reply!

Indeed, the code is more shorter and clean.. I'm now taking a look at TempHire sample and will look forward to the Compatibility Pack if the there's a lot of code and no time to upgrade all.

Thanks again!

Regards,
Dave
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