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);
}
/// <summary> /// Visitor pattern method for DbIsNullExpression. /// </summary> /// <param name="expression">The DbIsNullExpression that is being visited.</param> public abstract void Visit(DbIsNullExpression expression);