带有“不在”的实体框架查询

Posted 2023-03-29

【中文标题】带有“不在”的实体框架查询

【英文标题】：Entity Framework query with "not in"

【发布时间】：2014-01-01 16:20:11

【问题描述】：

我对相关表有一个简单（非常简单，不简单）的“不在”查询。

SELECT CompetencyID, CompetencyName FROM Competency
WHERE (Deleted = 0) AND (CompanyID = 1) AND (CompetencyID NOT IN(SELECT CompetencyID
FROM CompetencyGroups WHERE (Deleted = 0) AND (CompanyID = 1) AND (GroupID = 1))) AND
(ParentID = 0) ORDER BY CompetencyName

在 SQL 中，我得到了我需要的列表，其中包含不在组中的剩余项目。现在我想使用 EF5 将它绑定到 DataGrid。

我无法正确获取查询语法（使用 VB.net）来列出能力的 ID 和名称...

将提供的 c# 答案转换为 VB：

Dim excludeList = context.CompetencyGroups.Where(Function(x) x.Deleted = False And x.GroupID = GroupID).Select(Function(x) x.CompetencyID).ToArray
Dim results = context.Competencies.Where(Function(c) Not excludeList.Contains(c.CompetencyID) And c.Deleted = False And c.CompanyID = 1 And c.ParentID = 0).OrderBy(Function(c) c.CompetencyName)
GridView2.DataSource = results
GridView2.DataBind()

希望这对将来的某人有所帮助。我花了大约 4 个小时来搜索、询问和转换...

【参考方案1】：

类似

var excludeList = context.CompetencyGroups.Where(x => x....).Select(x => x.CompetencyID).ToArray();
var results = context.Competency.Where(x => !excludeList.Contains(x.CompetencyID));

更新：其他人对此进行了编辑，然后有人拒绝了它，但编辑很好（选择值）

【讨论】：

有人可以将其转换为 VB 吗？我试图实现，但可惜我迷失在Where(x => x....).Select(x => x.CompetencyID

【参考方案2】：

如果你需要 Cast 来制作一个整数数组。

Dim excludeList = context.CompetencyGroups.Cast(Of CompentencyGroup).Select(Function(x) x.CompetencyID).ToArray()
Dim results = context.Competency.Where(Function(x) Not excludeList.Contains(x.CompetencyID))