在LINQ中添加SQL WHERE子句

Question

使用VS 2013（VB）。

我有以下LINQ查询

Dim countCompanies = (From num In db.GasEmailAddresses 
           Group Join GCC In db.GasCompanies 
           On num.CompanyID Equals GCC.ID 
           Into GCComp = Group 
           Select num.CompanyID).Distinct.Count 

它返回4个结果。我想沿着

WHERE GCC.Active = 1 

我一直在搞乱这个位的代码位线添加where子句和不能似乎得到它的工作。

任何想法？

--- UPDATE ---

根据建议

修改后的代码

Dim countCompanies = (From num In db.GasEmailAddresses 
          Group Join GCC In db.GasCompanies.Where(Function(y) y.Active = 1) 
          On num.CompanyID Equals GCC.ID 
          Into GCComp = Group 
          Select num.CompanyID).Distinct.Count 

Answer 1

尽量过滤掉，同时检索数据源： -

companies.Where(Function(x) x.Active = 1)