linqpad中linq查詢執行錯誤

Question

我需要得到這個linq查詢的sql查詢。我使用linqpad。 我用Id變量調用。當執行LINQ查詢得到錯誤

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

查詢語言是C＃中的表達。

如何解決這個問題？

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

變化從工具欄上面的代碼編輯器中的查詢語言C# statements：

Answer 2

的問題是，你混合兩種Query Languages這裏。 雖然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 

是一個Expression。

簡單的解決方案：將您的Linq表達式包裝在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); 

全碼：

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);