Proper use of “Using” statement for datacontext

Question

I’m using Linq to Entities and lately, I found that a lot of folks recommending wrapping the datacontext in a using statement like this:

Using(DataContext db = n         


        

Answer 1

You can implement a Database factory which will cause your DbContext is being reused.

You can achieve this as follows:

DatabaseFactory class:

public class DatabaseFactory : Disposable, IDatabaseFactory
{
    private YourEntities _dataContext;
    public YourEntities Get()
    {
        return _dataContext ?? (_dataContext = new YourEntities());
    }
    protected override void DisposeCore()
    {
        if (_dataContext != null)
            _dataContext.Dispose();
    }
}

Excerpt of the Repository base class:

 public abstract class Repository : IRepository where T : class
{
    private YourEntities _dataContext;
    private readonly IDbSet _dbset;
    protected Repository(IDatabaseFactory databaseFactory)
    {
        DatabaseFactory = databaseFactory;
        _dbset = DataContext.Set();
    }

    protected IDatabaseFactory DatabaseFactory
    {
        get;
        private set;
    }

    protected YourEntities DataContext
    {
        get { return _dataContext ?? (_dataContext = DatabaseFactory.Get()); }
    }

Your table's repository class:

public class ApplicationRepository : Repository, IYourTableRepository
{
    private YourEntities _dataContext;

    protected new IDatabaseFactory DatabaseFactory
    {
        get;
        private set;
    }

    public YourTableRepository(IDatabaseFactory databaseFactory)
        : base(databaseFactory)
    {
        DatabaseFactory = databaseFactory;
    }

    protected new YourEntities DataContext
    {
        get { return _dataContext ?? (_dataContext = DatabaseFactory.Get()); }
    }

   }
    public interface IYourTableRepository : IRepository
   {
   }
}

This works perfectly together with AutoFac constructor injection as well.