DevForce Community Forum : Another "generic" question. Coming up with BaseRepository http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce 2010 : Another "generic" question. Coming up with BaseRepository Wed, 13 May 2026 11:33:03 -700 Thu, 12 Jan 2012 09:13:14 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=3210 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ Another "generic" question. Coming up with BaseRepository : Fair enough. Yes, I was writing... http://www.ideablade.com/forum/forum_posts.asp?TID=3210&PID=12447#12447 Author: katit
Subject: 3210
Posted: 12-Jan-2012 at 9:13am

Fair enough. Yes, I was writing BusyOff on error and success, so that will help me make this async code even better..
]]> Thu, 12 Jan 2012 09:13:14 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3210&PID=12447#12447 Another "generic" question. Coming up with BaseRepository : One of the places I make use of... http://www.ideablade.com/forum/forum_posts.asp?TID=3210&PID=12446#12446 Author: smi-mark
Subject: 3210
Posted: 12-Jan-2012 at 9:11am

One of the places I make use of the INotifyCompleted is with my Busy indicators. I might write some code like this:

Employee employee;
Busy.AddWatch();
Repository.GetEmployees(123, e => employee = e, ErrorHandler.HandleError)
                .WhenCompleted(args => Busy.RemoveWatch());

This way it's saying, no matter what the result, success or fail, I want to make sure I am executing a certain action.

Without this, you are forced to write code that looks like this:

Busy.AddWatch();
Repository.GetEmployees(123, e =>
{
   employee = e
   Busy.RemoveWatch();
},
(ex) =>
{
    ErrorHandler.HandleError(ex);
    Busy.RemoveWatch();
});

]]> Thu, 12 Jan 2012 09:11:03 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3210&PID=12446#12446 Another "generic" question. Coming up with BaseRepository : Actually, I am creating repository... http://www.ideablade.com/forum/forum_posts.asp?TID=3210&PID=12444#12444 Author: katit
Subject: 3210
Posted: 12-Jan-2012 at 8:43am

Actually, I am creating repository per unit of work as you suggest. Entity type in this case represents primary entity and I use "includes" to get other related entities that I need. Each repository takes care of maintaining (CRUD) whole MVVM for Silverlight's view.
 
Since you posted this sample, I was wondering why do I want to use INotifyCompleted? I find it easier to write code like below. When do I see benefit of using this interface? Simple Actions work well for me.
 

public void SaveAll(Action onSuccess = null, Action<Exception> onFail = null)

{

var op = this.EntityManager.SaveChangesAsync();

op.OnComplete(onSuccess, onFail);

}

 

 

 

]]> Thu, 12 Jan 2012 08:43:02 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3210&PID=12444#12444 Another "generic" question. Coming up with BaseRepository : Rather than create a repository... http://www.ideablade.com/forum/forum_posts.asp?TID=3210&PID=12443#12443 Author: smi-mark
Subject: 3210
Posted: 12-Jan-2012 at 8:33am

Rather than create a repository per entity type, you may want to create one per unit-of-work. Otherwise you are going to be creating a lot more work for your self than needed.

By unit of work, I mean a related set of entities. An example might be employees, the primary entity is Employee, but you also may have contacts, addresses, and other such related entities.

This is what I do:

public abstract class RepositoryBase<T> : IRepository        where T : EntityManager    {
    }

then I would create an IEmployeeRepository that might look like this:

public interface  IEmployeeRepository : IRepository    {        INotifyCompleted GetEmployee(Guid employeeId, Action<Employee> onSuccess, Action<Exception> onFail);
        INotifyCompleted GetEmployeeHistory(Guid employeeId, Action<IEnumerable<EmployeeHistory>> onSuccess, Action<Exception> onFail);     }

    public class EmployeeRepository :RepositoryBase<MyEntities>, IEmployeeRepository    {        public INotifyCompleted GetEmployee(Guid employeeId, Action<Employee> onSuccess, Action<Exception> onFail)        {        }

        public INotifyCompleted GetEmployeeHistory(Guid employeeId, Action<IEnumerable<EmployeeHistory>> onSuccess, Action<Exception> onFail)        {        }     }

DevForce Caliburn is a great framework to look at, I believe they have examples very similar to this.

]]> Thu, 12 Jan 2012 08:33:30 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3210&PID=12443#12443 Another "generic" question. Coming up with BaseRepository : Found solution.. Needed to... http://www.ideablade.com/forum/forum_posts.asp?TID=3210&PID=12442#12442 Author: katit
Subject: 3210
Posted: 12-Jan-2012 at 6:32am

Found solution.. Needed to do where T: Entity, new()
var Entity = new T(); //works]]> Thu, 12 Jan 2012 06:32:39 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3210&PID=12442#12442 Another "generic" question. Coming up with BaseRepository : I&#039;m finding that all... http://www.ideablade.com/forum/forum_posts.asp?TID=3210&PID=12437#12437 Author: katit
Subject: 3210
Posted: 11-Jan-2012 at 9:30pm

I'm finding that all my data repositories look alike and decided to try and make one base class with generics.
 
However, I'm struggling with following piece of code(see screenshot). How do I create entity instance of <T> in this GetNew() method?
 
]]> Wed, 11 Jan 2012 21:30:26 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3210&PID=12437#12437