C#, EF: Select from table using list of tuples

Question

Let's assume that I have a List of tuples with 3 properties. Now in my database, I have a Table that has 3 fields that may or may not match up with the tuples. How on earth do I tell EF

"Select from OtherTable o where o.Prop1 = tuple.Item1 && o.Prop2 = tuple.Item2 && o.Prop3 = tuple.Item3".

I understand very well how to do this if I have a single tuple, but I don't know how to do it when I have a list of tuples and I want all the matching records from OtherTable returned. If I was matching on a single property, I would do something like "where ListOfIds.Contains(id)...) and then go about my day but with multiple properties this approach falls apart.

Any help is greatly appreciated.

Answer 1

What about SQL query for entity with dynamic "where" condition?

    var list = new List<Tuple<string, int, bool>>();
    list.Add(new Tuple<string, int, bool>("1", 2, true));
    list.Add(new Tuple<string, int, bool>("2", 4, true));
    list.Add(new Tuple<string, int, bool>("3", 5, false));

    var query = list.Select(x => x.GetType().GetProperties().Select((y, index) => string.Concat("o.Prop", index + 1, "=", y.GetValue(x))).Aggregate((a, b) => a + " and " + b))
                    .Aggregate((a, b) => string.Format("({0}) or ({1})", a, b));

    var result = context.OtherTable.SqlQuery("Select * from OtherTable o where " + query).ToList();

OR you can use Contains that way (as wonderbell said, it will work only if all of your o.Prop N have string type, but you can try to use something like SqlFunctions.StringConvert to cast another type to string):

    var queryList = list.Select(x => x.GetType().GetProperties().ToList().OrderBy(x => x.Name).Select(y => y.GetValue(x).ToString())
                    .Aggregate((a, b) => a + "," + b));
    var result = context.OtherTable.Where(x => queryList.Contains(x.Prop1 + "," + x.Prop2 + "," + x.Prop3))
                    .ToList();