LinQ where clause contains using &&

Question

   var yCols = from t in flowPath
                select new {checkPoint = t["CheckPoint"]};
    var test = from x in operations
               where x["Ops"] = "test" && x["check"].Contains(yCols.Select(y=>y.Variable))

Somehow the contains in where clause part is not right.yCols returns Collection of Checkpoints and if x["Check"] contains any of the values then retrieve the value.Whats the best way to do this.

Answer 1

].Contains(yCols.Select(y=>y.checkPoint)) .It's not "y.Variable" but "y.checkPoint"

Answer 2

IEnumerable<string> yCols =
  from t in flowPath 
  select t["CheckPoint"];

IEnumerable<Operation> test =
  from x in operations 
  where x["Ops"] == "test" && yCols.Contains(x["check"])
  select x;

• Your code is more clear if you don't use var.
• Use == to compare and = to assign. Don't use = in where.
• Items don't contain collections. Collections contain items.