EntityFramework - contains query of composite key

Question

given a list of ids, I can query all relevant rows by:

context.Table.Where(q => listOfIds.Contains(q.Id));

But how do you achieve the sa

Answer 1

I tried this solution and it worked with me and the output query was perfect without any parameters

using LinqKit; // nuget     
   var customField_Ids = customFields?.Select(t => new CustomFieldKey { Id = t.Id, TicketId = t.TicketId }).ToList();

    var uniqueIds1 = customField_Ids.Select(cf => cf.Id).Distinct().ToList();
    var uniqueIds2 = customField_Ids.Select(cf => cf.TicketId).Distinct().ToList();
    var predicate = PredicateBuilder.New(false); //LinqKit
    var lambdas = new List>>();
    foreach (var cfKey in customField_Ids)
    {
        var id = uniqueIds1.Where(uid => uid == cfKey.Id).Take(1).ToList();
        var ticketId = uniqueIds2.Where(uid => uid == cfKey.TicketId).Take(1).ToList();
        lambdas.Add(t => id.Contains(t.Id) && ticketId.Contains(t.TicketId));
    }

    predicate = AggregateExtensions.AggregateBalanced(lambdas.ToArray(), (expr1, expr2) =>
     {
         var invokedExpr = Expression.Invoke(expr2, expr1.Parameters.Cast());
         return Expression.Lambda>
               (Expression.OrElse(expr1.Body, invokedExpr), expr1.Parameters);
     });


    var modifiedCustomField_Ids = repository.GetTable()
         .Select(cf => new CustomFieldKey() { Id = cf.Id, TicketId = cf.TicketId }).Where(predicate).ToArray();