Find 2nd max salary using linq

Question

I have following sql query for finding 2nd max salary.

Select * From Employee E1 Where
    (2) = (Select Count(Distinct(E2.Salary)) From Employee E2 Where
               


        

Answer 1

You can define equally comparer class as bellow:

    public class EqualityComparer : IEqualityComparer
    {
        #region IEqualityComparer Members
        bool IEqualityComparer.Equals(Employee x, Employee y)
        {
            // Check whether the compared objects reference the same data.
            if (Object.ReferenceEquals(x, y))
                return true;

            // Check whether any of the compared objects is null.
            if (Object.ReferenceEquals(x, null) || Object.ReferenceEquals(y, null))
                return false;

            return x.Salary == y.Salary;
        }

        int IEqualityComparer.GetHashCode(Employee obj)
        {
            return obj.Salary.GetHashCode();
        }
        #endregion
    }

and use it as bellow:

    var outval = lst.OrderByDescending(p => p.Id)
                  .Distinct(new EqualityComparer()).Skip(1).First();

or do it without equally comparer (in two line):

        var lst2 = lst.OrderByDescending(p => p.Id).Skip(1);
        var result = lst2.SkipWhile(p => p.Salary == lst2.First().Salary).First();

Edit: As Ani said to work with sql should do : var lst = myDataContext.Employees.AsEnumerable(); but if is for commercial software it's better to use TSQL or find another linq way.