/// <summary>
/// Visits the children of the <see cref="T:System.Linq.Expressions.UnaryExpression"/>.
/// </summary>
/// <returns>
/// The modified expression, if it or any subexpression was modified; otherwise, returns the original expression.
/// </returns>
/// <param name="node">The expression to visit.</param>
protected override Expression VisitUnary(UnaryExpression node)
{
if (node.NodeType == ExpressionType.Not)
{
_writer.NotOperater = true;
}
//if ((node.Operand is LambdaExpression) && (((LambdaExpression)node.Operand).Body is MemberExpression))
// base.Visit(node.Operand);
if (!(node.Operand is MemberExpression))
{
return(base.VisitUnary(node));
}
Visit(node.Operand);
if (QueryHelper.IsBoolean(node.Operand.Type) && !QueryHelper.IsHasValue(node.Operand))
{
_writer.Boolean(!QueryHelper.IsPredicate(node));
}
return(node);
}
