protected override ExpressionBase Combine(ExpressionBase left, ExpressionBase right)
{
right = ConditionalExpression.InvertExpression(right);
if (right.Type == ExpressionType.ParseError)
{
return(right);
}
right.IsLogicalUnit = true;
if (left == null)
{
return(right);
}
return(new ConditionalExpression(left, ConditionalOperation.And, right));
}