小编Jam*_*ath的帖子

有没有办法强制实体框架使用子查询的别名，而不是为 OrderBy 加倍它？

var results = Users.Select( u => new 
  { 
    u.idUser, 
    u.Name, 
    nbChilds = u.Children.Count 
  })
  .OrderBy( u => u.nbChilds );

这将在 SQL 中转换为：

SELECT [u].[idUser] AS [idUser], [u].[name] AS [Name], (
    SELECT COUNT(*)
    FROM [Children] AS [c0]
) AS [nbChilds]
FROM [Users] AS [u]
ORDER BY (
    SELECT COUNT(*)
    FROM [Children] AS [c]
)

这意味着它将对子项进行两次计数。就我而言，这对性能造成严重影响，我想避免。有没有办法告诉 Linq 在选择中使用别名，以便输出为：

SELECT [u].[idUser] AS [idUser], [u].[name] AS [Name], (
    SELECT COUNT(*)
    FROM [Children] AS [c0]
) AS [nbChilds]
FROM [Users] AS [u] …