实体框架使用LINQ返回连接表

Question

我有一些表：

table1: 
id1 
fk_tb2 // this is the fk to table2 

table2: 
id2 
fk_tb3 //this is the fk to table3 

table3: 
id3 
name3 

现在我想返回一个表，如： ID1 fk_tb2 NAME3

有谁知道如何做到这一点？由于

问候，

Answer 1

加入表和使用匿名类型返回所需的字段：

from t1 in table1 
join t2 in table2 on t1.fk_tb2 equals t2.id2 
join t3 in table3 on t2.fk_tb3 equals t3.id3 
select new { t1.id1, t2.id2, t3.name3 } 

Answer 2

如果您在导航以及映射，你可以这样做

var m = from tb1 in dbContext.table1 
     select new { 
        id1 = tb1.id1, 
        fk_tb2 = tb1.table2.tb2, 
        name3 = tb1.table2.table3.name3 
        }; 

其他你可以做

var m = from tb1 in dbContext.table1 
     join tb2 in dbContext.table2 on tb2.id2 equals tb1.fk_tb2 
     join tb3 in dbContext.table3 on tb3.id3 equals tb2.fk_tb3 
     select new { 
        id1 = tb1.id1, 
        fk_tb2 = tb2.id2, 
        name3 = tb3.name3 
        };