Movies CMS: Selecting an appropriate movie
So, the Movies CMS now looks like this. (To see a better view, click on it, or open it in another window).
The list of movies above are generated dynamically from the database.
The listings below are the letters from A to Z, followed by a “?”. The question mark is supposed to symbolize all movies that doesn't begin with A to Z, and lists those out.
So, I was using a DataSet in combination with a DataView to filter, like so:
daMovies.Fill(dsMovies, “Movies”);
dvMovies.RowFilter = FilterExpression;
where FilterExpression coerces the DataView, dvMovies to produce an interesting listings of movies.
FilterExpression reads like so: “Title LIKE 'A%'” when the letter “A” is selected, or “Title LIKE 'B%'” when the letter “B” is selected.
So, when “?” is selected, my initial RowFilter reads “Title LIKE '[^A-Z]%'”. What this expression means is that: Gimme all the movie titles that does not begin with the letter A..Z. Unfortunately, that didn't work. I was under the impression that RowFilter simply passes the FilterExpression on to the database backend, alas, that wasn't so. If that were the case, that expression would have worked, and I wouldn't be writing this entry now.
It appears that the FilterExpression is actually an interface implemented by other classes. For details, see “How to generate an SQL filter clause using C#”.
For now, the FilterExpression for “?” is left as blank, as I think out how to solve this interesting issue.