許多在LINQ

Question

許多查詢我有4個表：

地址 - AddressID，城市，地址，郵編

OBAddress - OBID，AddressID

OB - OBID

美國 - StateID，StateAbbreviation

如何加入三個標籤哪些在多對多的關係中？我想：

var recordsPhysicalAddress = (from a in db.Addresses 
    join oba in db.obAddresses on a.AddressID equals oba.AddressID 
    join ob in db.obAddresses on oba.obID equals passedinID 
    join s in db.States on a.StateID equals s.StateID 
    where oba.obID == ob.obID 
    && a.AddressTypeID == '5' //5 is records physical address 
    select new 
    { 
     a.Address1, 
     a.City, 
     a.StateID, 
     s.StateAbbreviation, 
     a.ZipCode 
    }).FirstOrDefault(); 

Answer 1

var query = (from a in db.Addresses 
      join oba in db.obAddresses on a.AddressID equals oba.AddressID 
      // do not join with db.obAddresses again 
      join s in db.States on a.StateID equals s.StateID 
      where oba.obID == passedinID // filter here 
        && a.AddressTypeID == '5' 
      select new { 
        a.Address, 
        a.City, 
        a.StateID, 
        s.StateAbbreviation, 
        a.ZipCode 
      }).FirstOrDefault(); 

我把一些言論的評論進行查詢。但仍然奇怪你爲什麼提到有問題的桌子？