c# - 如何在 LINQ to Entities (Entity Framewok) 中编写 SQL ORDER BY {value} DESC LIMIT 语句？

Question

我想在 LINQ to Entities 中编写以下 SQL 查询，我该怎么做？

SELECT codigo FROM Vendas ORDER BY codigo DESC LIMIT 1;

我知道如何使用 DESC，但是 LIMIT 1 呢？我可以用我所知道的东西编写这段代码，但如果表 Vendas 上有不止一行，它显然会抛出异常:

using (TccContext db = new TccContext())
{
    var query = (from venda in db.Vendas
                 orderby venda.codigo descending // `LIMIT 1` in LINQ should be added here I think
                 select venda).SingleOrDefault();
}

提前致谢。

Answer 1

using (TccContext db = new TccContext())
{
    var query = (from venda in db.Vendas
                 orderby venda.codigo descending
                 select venda).FirstOrDefault();
}

如果您需要一个元素的 Enumerable(实际上类似于 SQL limit):

using (TccContext db = new TccContext())
{
    var query = (from venda in db.Vendas
                 orderby venda.codigo descending
                 select venda).Take(1);
}