c# - Get Average Using LINQ

Question

Hoping someone can help me with the LINQ syntax to calculate an average. For example, I have the following LINQ query:

var rates = from rating in ctx.Rates  
            where rating.Id == Id  
            select new 
            {   
                UserId = rating.UserId,  
                Rating = rating.Rating  
            };  

If 10 records are returned, I need to calculate average on the Rating field. It is defined as as a Double in my DB. I am using LINQ to EF. So I would be assigning the UserId, MiscId, and the Rating would be the average on the records returned. I am passing one object back to the client code.

question from:https://stackoverflow.com/questions/4590704/get-average-using-linq

Answer 1

double RatingAverage = ctx.Rates.Where(r => r.Id == Id).Average(r => r.Rating);