c# - LINQ 连接多表

Question

我有 4 张桌子：

table1
id1,
fk_tbl2 //this is the foreign key to the "id" in table2

table2
id2,
fk_tbl3 //this is the foreign key to the "id" in table3

table3
id3,
fk_tbl4 //this is the foreign key to the "id" in table4

table4
id4,
name

我想进行多表连接，当用户输入“id4”时，我可以获得“table1”中的记录列表。

如何在 C# 中编写连接？谢谢。

Answer 1

from t1 in table1
join t2 in table2 on t1.fk_tbl2 equals t2.id2
join t3 in table3 on t2.fk_tbl3 equals t3.id3
join t4 in table4 on t3.fk_tbl4 equals t4.id4
where t4.id4 == id
select t1