linqpad中linq查询执行错误

Question

我需要得到这个linq查询的sql查询。我使用linqpad。 我用Id变量调用。当执行LINQ查询得到错误

) or end of expression expected (change the Query Language to 'C# Statements' for multi-statement queries)

查询语言是C＃中的表达。

如何解决这个问题？

Id=110000; 
from u in BusProvinces 
where (from s in BusProvinces 
     join buscities in BusCities on s.Id equals buscities.ProvinceId 
     join buspath in BusPaths on buscities.Id equals buspath.DesId 
     where (buspath.DepId == Id || Id == 0) 
     select s.Id).Contains(u.Id) 
select u 

Answer 1

变化从工具栏上面的代码编辑器中的查询语言C# statements：

Answer 2

的问题是，你混合两种Query Languages这里。 虽然Id=110000;是single-line statement，

from u in BusProvinces 
where (from s in BusProvinces 
     join buscities in BusCities on s.Id equals buscities.ProvinceId 
     join buspath in BusPaths on buscities.Id equals buspath.DesId 
     where (buspath.DepId == Id || Id == 0) 
     select s.Id).Contains(u.Id) 
select u 

是一个Expression。

简单的解决方案：将您的Linq表达式包装在var中。

var query = (from u in BusProvinces 
where (from s in BusProvinces 
     join buscities in BusCities on s.Id equals buscities.ProvinceId 
     join buspath in BusPaths on buscities.Id equals buspath.DesId 
     where (buspath.DepId == Id || Id == 0) 
     select s.Id).Contains(u.Id) 
select u); 

全码：

Id=110000; 
var query = (from u in BusProvinces 
where (from s in BusProvinces 
     join buscities in BusCities on s.Id equals buscities.ProvinceId 
     join buspath in BusPaths on buscities.Id equals buspath.DesId 
     where (buspath.DepId == Id || Id == 0) 
     select s.Id).Contains(u.Id) 
select u);