Question

Here is my code:

var finiGames = myRepos.Games
                       .Where(x => x.StatusGameId == (int)StatusGameEnum.Finish 
                              && x.EndDateTime > DateTime.Today)
                       .DefaultIfEmpty();
//error line
decimal? sum = finiGames.Sum(x => x.WinCost);

The error I am getting:

Error converting cast a value type “Decimal”, because materializuemoe
value is null. The overall result of the type parameter or a request
to use a type that allows the value null.

What is the proper way to get a decimal??

Answer 1

You need to cast the WinCost to a nullable decimal inside the Sum

decimal? sum = finiGames.Sum(x => (decimal?)x.WinCost);