本文整理汇总了C#中SelectExpression.AddRedundantSelect方法的典型用法代码示例。如果您正苦于以下问题：C# SelectExpression.AddRedundantSelect方法的具体用法？C# SelectExpression.AddRedundantSelect怎么用？C# SelectExpression.AddRedundantSelect使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类SelectExpression的用法示例。
在下文中一共展示了SelectExpression.AddRedundantSelect方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: VisitSelect
protected override Expression VisitSelect(SelectExpression select)
{
// select * from table order by x skip s take t
// =>
// select * from (select top s * from (select top s + t from table order by x) order by -x) order by x
select = (SelectExpression)base.VisitSelect(select);
if (select.Skip != null && select.Take != null && select.OrderBy.Count > 0)
{
var skip = select.Skip;
var take = select.Take;
var skipPlusTake = PartialEvaluator.Eval(Expression.Add(skip, take));
select = select.SetTake(skipPlusTake).SetSkip(null);
select = select.AddRedundantSelect(new TableAlias());
select = select.SetTake(take);
// propogate order-bys to new layer
select = (SelectExpression)OrderByRewriter.Rewrite(select);
var inverted =
select.OrderBy.Select(
ob =>
new OrderExpression(
ob.OrderType == OrderType.Ascending ? OrderType.Descending : OrderType.Ascending, ob.Expression));
select = select.SetOrderBy(inverted);
select = select.AddRedundantSelect(new TableAlias());
select = select.SetTake(Expression.Constant(0)); // temporary
select = (SelectExpression)OrderByRewriter.Rewrite(select);
var reverted =
select.OrderBy.Select(
ob =>
new OrderExpression(
ob.OrderType == OrderType.Ascending ? OrderType.Descending : OrderType.Ascending, ob.Expression));
select = select.SetOrderBy(reverted);
select = select.SetTake(null);
}
return select;
}