Where does Unit Of Work belong w/ EF4, IoC (Unity), and Repository?

Question

I see several questions relating somewhat to this, but I still can\'t find the answer I\'m looking for, so I\'m posting my question. If another question holds the answer (a

Answer 1

One way is to manage this is to use the method described in http://mfelicio.wordpress.com/2010/02/07/managing-the-entity-framework-objectcontext-instance-lifetime-in-wcf-and-sharing-it-among-repositories/ That article implements the ContextManager for Wcf services. For ASP.NET app we could use something like this.

public class AspNetDBContextManager : IDBContextManager
    where TContext : IDBContext, new()
{
    #region IDBContextManager Members

    public IDBContext GetDBContext()
    {
        return this.GetOrCreateDbContext();
    }

    private IDBContext GetOrCreateDbContext()
    {
        if (HttpContext.Current == null)
        {
            throw new InvalidOperationException("Can be used only within ASP.NET applications");
        }

        string dbContextKey = string.Format("__AspNetDBCM__{0}__", HttpContext.Current.GetHashCode());

        object dbContext = HttpContext.Current.Items[dbContextKey];

        if (dbContext == null)
        {
            dbContext = new TContext();

            if (dbContext != null)
            {
                HttpContext.Current.Items[dbContextKey] = dbContext;
            }
        }

        return dbContext as IDBContext;
    }

    #endregion
}

public interface IDBContext
{
    object Context { get; }
}


public interface IDBContextManager
{
    IDBContext GetDBContext();
}