Entity Framework calling MAX on null on Records

Question

When calling Max() on an IQueryable and there are zero records I get the following exception.

The cast to value type \'Int32\' failed because the materialize

Answer 1

I couldnt take no for an answer :) I have tested the below and it works, I havent checked the SQL generated yet so be careful, I will update this once I have tested more.

var test = ctx.Entries
    .Where(e => e.Competition.CompetitionId == storeCompetition.CompetitionId)
    .MaxOrDefault(x => x.Version);

public static TResult? MaxOrDefault(this IEnumerable source, Func selector)
    where TResult : struct
{
    return source
        .Select(selector)
        .Cast()
        .Max();
}