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

You can use Union for each composite primary key:

var compositeKeys = new List 
{
    new CK { id1 = 1, id2 = 2 },
    new CK { id1 = 1, id2 = 3 },
    new CK { id1 = 2, id2 = 4 }
};

IQuerable query = null;
foreach(var ck in compositeKeys)
{
    var temp = context.Table.Where(x => x.id1 == ck.id1 && x.id2 == ck.id2);
    query = query == null ? temp : query.Union(temp);
}
var result = query.ToList();