linq to sql:连接同一表中的多个列
问题描述：
如何通过Linq内部联接来自同一表的多个列?
How do I inner join multiple columns from the same tables via Linq?
例如: 我已经有了这个...
For example: I already have this...
join c in db.table2 on table2.ID equals table1.ID
我需要添加这个...
I need to add this...
join d in db.table2 on table2.Country equals table1.Country
答
您可以将查询放在Where子句中，而不使用联接运算符.
You can put your query inside a Where clause instead of using the join operator.
join运算符在VB.NET中支持多个子句，但在C#中不支持.
The join operator supports multiple clauses in VB.NET, but not C#.
或者，您可以使用ANSI-82风格的"SQL"语法，例如:
Alternatively, you can use the ANSI-82 style of 'SQL' syntax, e.g.:
from t1 in table1
from t2 in table1
where t1.x == t2.x
&& t1.y == t2.y