LINQ to SQL，加入表以獲得不同的結果？

Question

我想寫一個LINQ查詢，它會從兩個SQL Server數據表中得到一些不同的值。

我有兩個表名爲Facility_Cost_TBL和Tenant_Bills_TBL。 然後我有一個名爲Nursing_Home_Name的列，我試圖從中獲取不同的數據。

這是我在LINQ的努力，但它不工作，

var name = (from f in dataContext.Facility_Cost_TBLs 
       join t in dataContext.Tenant_Bills_TBLs on f.Tenant_Code equals t.Tenant_Code 
       where f.Tenant_Code == code && f.Date_Month == date.Month && f.Date_Year == date.Year 
       select new {Facility_Cost_TBL = f, Tenant_Bills_TBL = t}).Distinct(); 

這是一個工作的SQL語句，我做了，做我通過T-SQL想要什麼。

SELECT DISTINCT Nursing_Home_Name 
     FROM (SELECT Nursing_Home_Name 
     FROM Facility_Cost_TBL 
     WHERE Date_Year = 2016 AND Date_Month = 10 AND Tenant_Code = 664250 
     UNION SELECT Nursing_Home_Name 
     FROM Tenant_Bills_TBL 
     WHERE Year_Data = 2016 AND Month_Data = 10 AND Tenant_Code = 664250) 
     a 

有人能告訴我什麼LINQ和語法時纔將是什麼LINQ擴展方法查詢什麼樣的？

Answer 1

請嘗試以下

var names = ((from f in dataContext.Facility_Cost_TBLs 
              where f.Tenant_Code == "664250" && f.Date_Month == "10" && f.Date_Year == "2016" 
              select new { Nursing_Home_Name = f.Nursing_Home_Name }). 
              Union(
              from t in dataContext.Tenant_Bills_TBLs 
              where t.Tenant_Code == "664250" && t.Date_Month == "10" && t.Date_Year == "2016" 
              select new { Nursing_Home_Name = t.Nursing_Home_Name })).ToList(); 

希望這將幫助你

Answer 2

試試這個，看看這是否正常工作。 LINQ to SQL: Multiple joins ON multiple Columns. Is this possible?

var name = (from f in dataContext.Facility_Cost_TBLs 
       join t in dataContext.Tenant_Bills_TBLs equals on new { f.Tenant_Code, f.Date_Month, f.Date_Year } equals new { t.Tenant_Code, t.Date_Month, t.Date_Year } 
       where f.Tenant_Code == code && f.Date_Month == date.Month && f.Date_Year == date.Year 
       select new {Facility_Cost_TBL = f, Tenant_Bills_TBL = t}).Distinct();