WP7 and Factory Methods

Atopper posted on Friday, August 26, 2011

I’m experimenting with WP7 and using a ReadOnlyListBase with the factory methods. Does this work on the WP7 Platform? I keep getting an ArgumentException when the factory method is called. This may be a silly question, I apologize, I’m new to 4.1 and have not been using CSLA since the .Net 2.0 versions.

I have read the books and look through all the examples I could find. If someone has a good example or could direct me to a posting, it would be much appreciated. I'm looking forward to the WP7 book, I hope a draft version is on it's way this fall.

Regards,

Andrew

JonnyBee replied on Saturday, August 27, 2011

In WP7 running in local mode the factory methods get a Callback function as last parameter. I believe that is missing in your code and hence you get an ArgumentException.

If you look at the WindowsPhone\cs\SimpleApp in Csla samples download you can add a CustomerFactory like this:

Add object factory attribute to CustomerEdit

  [ObjectFactory(typeof(CustomerEditFactory))]
  public class CustomerEdit : BusinessBase<CustomerEdit>

And add this class 

  public class CustomerEditFactory : Csla.Server.ObjectFactory
  {
    public void Create(Csla.DataPortalClient.FactoryProxy<Library.CustomerEdit>.CompletedHandler callback)
    {
      try
      {
        var obj = (CustomerEdit)Activator.CreateInstance(typeof(CustomerEdit));
        using (BypassPropertyChecks(obj))
          obj.Status = "Created " + ApplicationContext.ExecutionLocation.ToString();
        MarkNew(obj);
        callback.Invoke(obj, null);
      }
      catch (Exception ex)
      {
        callback.Invoke(null, ex);
      }
    }
 
    public void Fetch(SingleCriteria<CustomerEdit, int> criteria, 
                      Csla.DataPortalClient.FactoryProxy<Library.CustomerEdit>.CompletedHandler callback)
    {
      try
      {
        var obj = (CustomerEdit)Activator.CreateInstance(typeof(CustomerEdit));
 
        using (BypassPropertyChecks(obj))
        {
          obj.Id = criteria.Value;
          obj.Name = "Test " + criteria.Value;
          obj.Status = "Retrieved " + ApplicationContext.ExecutionLocation.ToString();
        }
        MarkOld(obj);
        callback.Invoke(obj, null);
      }
      catch (Exception ex)
      {
        callback.Invoke(null, ex);
      }
    }
 
 
    public void Update(CustomerEdit obj, 
                       Csla.DataPortalClient.FactoryProxy<Library.CustomerEdit>.CompletedHandler callback)
    {
      try
      {
        // call something to save the object
 
 
        MarkOld(obj);
        callback.Invoke(obj, null);
      }
      catch (Exception ex)
      {
        callback.Invoke(null, ex);
      }
    }
  }

Atopper replied on Sunday, August 28, 2011

That clears things up. The world has changed in the last 5 years! Thank you very much.

Andrew