LEFT LINQ TO SQL C#加入多对多表

嗨，我对linq到sql有点陌生，我知道一些基础知识。问题是我想在查询中执行左联接。查询中有3个表。

1. 索赔人（应从此表返回所有行）
2. 索赔
3. 用户

查询应返回所有拥有索赔人的用户。这是通过多对多表声明来完成的。但无论用户如何，所有索赔人都应被退回。因此，左派加入了申诉人的行列。

我有以下查询

    var d = (from Claimants in DB.Claimants
                 join Claims in DB.Claims on Claimants.Claiment_ID equals Claims.Claiment_ID
                 join Users in DB.Users on Claims.User_ID equals Users.User_ID
                 where (Claimants.TrialDate.Value >= dtDayStart & Claimants.TrialDate <= dtDayEnd)
                 select new
                 {
                     ClaimantFirstName = Claimants.FirstName,
                     ClaimantLasname = Claimants.LastName,
                     ClaimantsID = Claimants.IDNumber,
                     Claimants.OurReference,
                     Claimants.TrialDate,
                     InterviewStart = Claims.DateTimeStart,
                     InterviewEnd = Claims.DateTimeEnd,
                     Claims.Priority,
                     UserFirstname = Users.FirstName,
                     UserLastName = Users.LastName,
                     UserID = Users.IDNumber
                 });

我试着使用如下的into语句，但没有成功

        var d = (from Claimants in DB.Claimants
                 join Claims in DB.Claims on Claimants.Claiment_ID equals Claims.Claiment_ID
                 into TheClaimants
                 from Claims in TheClaimants.DefaultIfEmpty()
                 join Users in DB.Users on Claims.User_ID equals Users.User_ID
                 where (Claimants.TrialDate.Value >= dtDayStart & Claimants.TrialDate <= dtDayEnd)
                 select new
                 {
                     ClaimantFirstName = Claimants.FirstName,
                     ClaimantLasname = Claimants.LastName,
                     ClaimantsID = Claimants.IDNumber,
                     Claimants.OurReference,
                     Claimants.TrialDate,
                     InterviewStart = Claims.DateTimeStart,
                     InterviewEnd = Claims.DateTimeEnd,
                     Claims.Priority,
                     UserFirstname = Users.FirstName,
                     UserLastName = Users.LastName,
                     UserID = Users.IDNumber
                 });

如果有人能为我指明正确的方向，告诉我如何正确使用这些连接，并解释它是如何工作的，我将不胜感激。事先非常感谢。