How to get records in EF that match a list of combinations (key/values)?

Question

I have a database table with records for each user/year combination.

How can I get data from the database using EF and a list of userId/year combinations? S

Answer 1

you can try this

//add the possible filters to LIST
var searchIds = new List { "1-2015", "1-2016", "2-2018" };

//use the list to check in Where clause
var result = (from x in YearResults
        where searchIds.Contains(x.UserId.ToString()+'-'+x.Year.ToString())
        select new UserYearCombination
        {
            UserId = x.UserId,
            Year = x.Year
        }).ToList();

Method 2

var d = YearResults
           .Where(x=>searchIds.Contains(x.UserId.ToString() + '-' + x.Year.ToString()))
           .Select(x => new UserYearCombination
                 {
                      UserId = x.UserId,
                      Year = x.Year
                 }).ToList();