LINQ TO SQL, Dynamic query with DATE type fields

Question

I\'m building a query with the LINQ dynamic library so I don\'t know how many potential parameters will I have and I get an error when trying to query DATE type fields:

Answer 1

Because I had to make a comparison for a DateTime? and I had make this modification.

else if (left.Type == typeof(DateTime?) && right.Type == typeof(string))
{
  if (right is ConstantExpression)
  {
    DateTime datevalue;
    string value = ((ConstantExpression)right).Value.ToString();
    if (DateTime.TryParse(value, out datevalue))
    {
      DateTime? nullableDateValue = datevalue;
      right = Expression.Constant(nullableDateValue, typeof(DateTime?));
    }
    else
    {
      throw IncompatibleOperandsError(op.text, left, right, op.pos);
    }
  }
  else
  {
    throw IncompatibleOperandsError(op.text, left, right, op.pos);
  }
}

Thanks for the tip!