Monthly Archives: September 2008

NHibernate possible bug in IQuery.List<T>()

recently, we had to clean the database from all the testing data, when an error similar to the following appeared:

The value “” is not of type “System.Nullable`1[System.DateTime]” and cannot be used in this generic collection

The code I executed was:

            IQuery query = DbManager.MySession.CreateQuery(“select max(dateObject.EndDate) from DateDomain dateObject”);

            IList<DateTime?> list = query.List<DateTime?>();

When I debugged NHibernate code, I reached to the following AddAll() method in the ArrayHelper class:

  152 // NH-specific

  153         public static void AddAll(IList to, IList from)

  154         {

  155             foreach (object obj in from)

  156             {

  157                 to.Add(obj);

  158             }

  159         }

You can find the explanation of the error here.
Which brings us to the interesting question: why the implementation of IList Add method doesn’t consider the “nullability” of the T object? and why the parameter is of type IList ?!

 Am I missing something? should I report it as a bug?

Software gadgets

In the early days when the Internet was Blog-free, my machine was light and clean, it was barely Visual Sutdio, SQL Server Express (then it was called MSDE) , Office, MSN and IIS. I always believed in the light clean machine, no goofy software around.

Then Blogs started to appear, and more interesting blogs had my attention like Scott’s and Omar’s, and with it I started to learn about new software gadgets. From that day, I am addicted!

First it was the Ultimate Tools List, I browsed it, and out of interest I downloaded Launchy, AMAZING (can’t live without it)!! then Notepad++ then SyncToy, then Process Explorer, Cropper, and I couldn’t stop!

Now there are wonderful sites like FileHippo that is a prime source for new software gadgets and their update news. but the surprise was Wakoopa; who thought there would be a whole social community website built around software enthusiasm!

But anyway, I still believe in clean and light machines, I don’t download toys that I don’t need, and regularly monitor their effect on my machine; the beauty of both worlds 🙂