LINQ 和嵌套查询 - 编程之家

如何解决LINQ 和嵌套查询

我需要你的帮助，我是 ASPNET mvc 的新手，我对 LINQ 的理解有一个大问题：D 我需要做这个简单的查询：

Select * from Scarico
where Scarico.CaricoId in
(Select Id from Carico where Carico.MattonieraId = ID) <-- ID is

我尝试使用这种方法来检索 Scarichi 列表：

private List<Scarico> GetScarichiList(Guid id)
{
    var listaCarichi = from Carico in _db.Carico
                        where Carico.MattonieraId.Equals(id)
                        select Carico.Id;

    var ScarichiList = (from Scarico in _db.Scarico
                            where listaCarichi.Contains(Scarico.Id)
                            select Scarico).ToList();

    return ScarichiList;
}

第二个变量“ScarichiList”不包含任何值，实际上它应该包含2个值... 我哪里错了？

提前致谢

编辑：

自动生成的 sql：查询 1 (listaCarichi)：

SELECT [Extent1].[Id] AS [Id] FROM [dbo].[Carico] AS [Extent1] WHERE [Extent1].[MattonieraId] = @p__linq__0}

查询 2（ScarichiList）：

SELECT
    [Extent1].[Id]      AS [Id],[Extent1].[Stato]   AS [Stato],[Extent1].[DataReg] AS [DataReg],[Extent1].[UltAgg]  AS [UltAgg],...
FROM [dbo].[Scarico] AS [Extent1]
WHERE EXISTS (SELECT 1 AS [C1] FROM [dbo].[Carico] AS [Extent2] WHERE ([Extent2].[MattonieraId] = @p__linq__0)
  AND ([Extent2].[Id] = [Extent1].[Id]) )