LINQ和整数键

Question

我有一个数据库，其中的表外键的查找表：

Table1: 
Table1Id int 

Table2: 
Table2Id int 
ForeignKeyToTable1 int 

LookupTable: 
Table2Id 
Table3Id 

Table3: 
Table3Id int 
Table3Field varchar 

我想：

select table1.* from table1 
inner join table2 on table1.Table1Id = ForeignKeyToTable1 
inner join LookupTable on LookupTable.Table2Id = table2.Table2Id 
inner join Table3 on table3.Table3Id = LookupTable.Table3Id 
where table3.Table3Field ='qwerty' 

这怎么Linq中可以实现吗？

Answer 1

var query = 
      from table1 in db.Table1 
      join table2 in db.Table2 on new { Table1Id = table1.Table1Id } equals new { Table1Id = table2.ForeignKeyToTable1 } 
      join lookuptable in db.LookupTable on table2.Table2Id equals lookuptable.Table2Id 
      join table3 in db.Table3 on lookuptable.Table3Id equals table3.Table3Id 
      where 
       table3.Table3Field == "qwerty" 
      select new { 
       table1.Table1Id 
      }; 

Answer 2

我相信这样的事情会去

var query = from t1 in context.Table1 
      join t2 in context.Table2 
       on t1.Table1Id equals t2.ForeignKeyToTable1 
      join lt in context.LookupTable 
       on t2.Table2Id equals lt.Table2Id 
      join t3 in context.Table3 
       on lt.Table3Id equals t3.Table3Id 
      where t3.Table3Field == "qwerty" 
      select t1;