Question

I am building a basic blog module that allows the user to rate the blog posts.

The ratings are submitted via an ajax extension and held in a data table as an INT value.

When I call the ratings onto the page using a variable I would like to calculate the overall average rating.

Could anyone shed some light on how I would go about doing this?

Here is my code:

var rating = from x in db.DT_Control_BlogRatings
                         where x.Blog_ID == int.Parse(codesnippets.Decrypt(Request["blg"].ToString(), true))
                         select new
                         {
                             x.RatingNo,
                             x.RatingID,
                         };

            string usercount = rating.Count().ToString();

            LB_UserRating.Text = "Currently rated " + usercount + " times";

Many thanks!

Answer 1

// Extract the blog id before the query, because this instruction can't be translated to SQL
int blogId = int.Parse(codesnippets.Decrypt(Request["blg"].ToString(), true));

var ratings = from x in db.DT_Control_BlogRatings
              where x.Blog_ID == blogId
              select x.RatingNo;
var avg = ratings.Average();