public override DbExpression Visit(DbIsNullExpression expression)
        {
            EntityUtil.CheckArgumentNull(expression, "expression");

            return(VisitUnary(expression, exp =>
            {
                if (TypeSemantics.IsRowType(exp.ResultType))
                {
                    //
                    return CqtBuilder.CreateIsNullExpressionAllowingRowTypeArgument(exp);
                }
                else
                {
                    return CqtBuilder.IsNull(exp);
                }
            }
                              ));
        }
 /// <summary>
 /// Typed visitor pattern method for DbIsNullExpression.
 /// </summary>
 /// <param name="expression">The DbIsNullExpression that is being visited.</param>
 /// <returns>An instance of TResultType.</returns>
 public abstract TResultType Visit(DbIsNullExpression expression);
 /// <summary>
 /// Visitor pattern method for <see cref="DbIsNullExpression"/>.
 /// </summary>
 /// <param name="expression">The DbIsNullExpression that is being visited.</param>
 /// <exception cref="ArgumentNullException"><paramref name="expression"/> is null</exception>
 public override void Visit(DbIsNullExpression expression)
 {
     VisitUnaryExpression(expression);
 }
Пример #4
0
 /// <summary>
 /// Visitor pattern method for DbIsNullExpression.
 /// </summary>
 /// <param name="expression">The DbIsNullExpression that is being visited.</param>
 public abstract void Visit(DbIsNullExpression expression);