Convertir SQL avec interne et externe Joindre à L2S

Question

J'ai besoin de convertir le Sproc ci-dessous à une requête Linq. Au fond, c'est ce que j'ai jusqu'ici. Pour référence, les champs derrière la "Splat" (pas mon sproc) sont

ImmunizationID int, HAReviewID int, ImmunizationMaintID int, ImmunizationOther varchar(50), ImmunizationDate smalldatetime, ImmunizationReasonID int

Les deux premiers sont PK et FK, respectivement. Les deux autres int sont attachés à la table Maint où la description est stockée. Voilà ce que je suis coincé sur le INNER JOIN ET le LEFT OUTER JOIN

Merci,

SELECT tblHAReviewImmunizations.*, 
     tblMaintItem.ItemDescription, 
     tblMaintItem2.ItemDescription as Reason 
FROM 
     dbo.tblHAReviewImmunizations 
     INNER JOIN dbo.tblMaintItem 
      ON dbo.tblHAReviewImmunizations.ImmunizationMaintID = 
       dbo.tblMaintItem.ItemID 
     LEFT OUTER JOIN dbo.tblMaintItem as tblMaintItem2 
      ON dbo.tblHAReviewImmunizations.ImmunizationReasonID = 
       tblMaintItem2.ItemID 
WHERE 
     HAReviewID = @haReviewID 

---

Ma tentative à ce jour ->

public static DataTable GetImmunizations(int haReviewID) 
{ 
    using (var context = McpDataContext.Create()) 
    { 
     var currentImmunizations = 
      from haReviewImmunization in context.tblHAReviewImmunizations 
      where haReviewImmunization.HAReviewID == haReviewID 
      join maintItem in context.tblMaintItems 
       on haReviewImmunization.ImmunizationReasonID 
       equals maintItem.ItemID into g 
      from maintItem in g.DefaultIfEmpty() 
      let Immunization = GetImmunizationNameByID(
       haReviewImmunization.ImmunizationMaintID) 
      select new 
      { 
       haReviewImmunization.ImmunizationDate, 
       haReviewImmunization.ImmunizationOther, 
       Immunization, 
       Reason = maintItem == null ? " " : maintItem.ItemDescription 
      }; 

     return currentImmunizations.CopyLinqToDataTable(); 
    } 
} 

private static string GetImmunizationNameByID(int? immunizationID) 
{ 
    using (var context = McpDataContext.Create()) 
    { 
     var domainName = 
      from maintItem in context.tblMaintItems 
      where maintItem.ItemID == immunizationID 
      select maintItem.ItemDescription; 

     return domainName.SingleOrDefault(); 
    } 
} 

Answer 1

public static DataTable GetImmunizations(int haReviewID) 
{ 
    using (var context = McpDataContext.Create()) 
    { 
     var currentImmunizations = 
      from haReviewImmunization in context.tblHAReviewImmunizations 
      where haReviewImmunization.HAReviewID == haReviewID 

      join maintItem in context.tblMaintItems 
      on haReviewImmunization.ImmunizationMaintID 
      equals maintItem.ItemID 

      join maintItem2 in context.tblMaintItems 
      on haReviewImmunization.ImmunizationReasonID 
      equals maintItem2.ItemID into g 
      from maintItem3 in g.DefaultIfEmpty() 

      select new 
      { 
       haReviewImmunization.ImmunizationDate, 
       haReviewImmunization.ImmunizationOther, 
       maintItem.ItemDescription, 
       Reason = maintItem3 == null ? " " : maintItem3.ItemDescription 
      }; 

     return currentImmunizations.CopyLinqToDataTable(); 
    } 
}