C# 如何使用实体框架核心在On子句中添加多个条件

作为数据库表A、B和AB（AB是A和B表之间的多对多关联），并且在

Entity Frameworc Core

数据库上下文中只有表A和B声明为

DbSet

，如何使用

LINQ

to

sql

SELECT A.Id, A.Name
FROM A
LEFT JOIN AB ON AB.AId = A.Id AND AB.BId = @myVariable
WHERE AB.AId IS NULL

SELECT [a].[Id], [a].[Name]
FROM [A] AS [a]
LEFT JOIN (
     SELECT [ab].[AId], [ab].[BId]
     FROM [AB] AS [ab]
     WHERE [ab].[BId] = @__variable_0
) AS [t] ON [i].[Id] = [t].[AId]
WHERE [t].[BId] IS NULL

以下

LINQ

var result = (from a in _context.A
              from t in a.ABs
                  .DefaultIfEmpty()
                  .Where(x => x.BId == @variable)
              where t == null
              select a)
return result.ToListAsync();

生成以下

SQL

SELECT A.Id, A.Name
FROM A
LEFT JOIN AB ON AB.AId = A.Id AND AB.BId = @myVariable
WHERE AB.AId IS NULL

SELECT [a].[Id], [a].[Name]
FROM [A] AS [a]
LEFT JOIN (
     SELECT [ab].[AId], [ab].[BId]
     FROM [AB] AS [ab]
     WHERE [ab].[BId] = @__variable_0
) AS [t] ON [i].[Id] = [t].[AId]
WHERE [t].[BId] IS NULL

我如何更新我的

LINQ

以避免子查询语句，而不在

实体框架

上下文中添加AB表作为

DbSet

属性？

它仍然不是固定的“功能”它仍然不是固定的“功能”