linq查询中的Distinct关键字

我的linq查询返回重复记录，如下所示，我必须如何在此linq查询中使用distinct关键字

var draft_recieved = from df in _DataContext.tblDrafts
                     from dfBody in _DataContext.DraftBodies
                     from sendUser in _DataContext.tblSends

                     where (df.DraftId == dfBody.DraftID) && (df.DraftId == sendUser.DraftId) &&
                     (sendUser.ToEmailId == (Guid)Membership.GetUser().ProviderUserKey)
                     select new

                     {
                         subject = dfBody.Subject,
                         draftid = df.DraftId
                     };

.Distinct（）

必须作为扩展方法应用

var draft_recieved = (from df in _DataContext.tblDrafts
                 from dfBody in _DataContext.DraftBodies
                 from sendUser in _DataContext.tblSends

                 where (df.DraftId == dfBody.DraftID) && (df.DraftId == sendUser.DraftId) &&
                 (sendUser.ToEmailId == (Guid)Membership.GetUser().ProviderUserKey)
                 select new

                 {
                     subject = dfBody.Subject,
                     draftid = df.DraftId
                 }).Distinct();

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啊，这太糟糕了，但谢谢你的回答，我得用它。