使用 Entity Framework 4 将 SQL 'not in' 转换为 LINQ to Entities

Question

如何使用 Entity Framework 4 将带有“not in”关键字的 SQL 转换为 LINQ to Entities？ 所有以“ID”结尾的字段都是整数类型。

SELECT * 
        FROM IRSampleCompletionGoal as goal_tbl
  where 
  (Cast(goal_tbl.[TermID] as nvarchar) +' '+Cast(goal_tbl.[UserID] as nvarchar)+' '+Cast(goal_tbl.[CourseID] as nvarchar)+' '+cast(goal_tbl.[StudentID] as nvarchar)+' '+cast(goal_tbl.[ObjectiveID] as nvarchar))  
  NOT IN
  (
  select (Cast([TermID] as nvarchar) +' '+Cast([UserID] as nvarchar)+' '+Cast([CourseID] as nvarchar)+' '+cast([StudentID] as nvarchar)+' '+cast([ObjectiveID] as nvarchar)) 
  from IRSampleCompletionCurrentStatistics
  where ((ArtifactID is not null) OR (NoArtifactChecked='True' ))

  )

Answer 1

试试这样的：

 goal_tbl.Where(x => !IRSampleCompletionCurrentStatistics.Where(i => i.ArtifactID != null || i.NoArtifactChecked == true).Any(i => (i.TermID.ToString() + " " + i.UserID.ToString() + i.StudentID.ToString() + " " + i.ObjectiveID.ToString()) == (x.TermID.ToString()+ " " + x.UserID.ToString() + " " + x.CourseID.ToString() + " " + x.StudentID.ToString() + x.ObjectiveID.ToString()))