LINQ到實體不支持的方法... System.Object的CompareObjectEqual

Question

當我執行下面的代碼我收到錯誤消息：

LINQ到實體無法識別方法「System.Object的CompareObjectEqual（ System.Object，System.Object，Boolean）'方法，並且此方法不能轉換爲存儲表達式。

它似乎發生在PCstudent中的每行第2行。

Protected Sub btnPushSemester_Click(sender As Object, e As EventArgs) Handles btnPushSemester.Click 
    Dim dbPC As New Campus6Entities 
    Dim dbContext As New pbu_housingEntities 
    Dim getOccupants 
    Dim thisYear As String 
    Dim thisTerm As String 
    Using dbContext 
     Dim get_Year = From p In dbContext.Configs _ 
          Where p.Description = "year" _ 
          Select p 

     Dim get_Term = From p In dbContext.Configs _ 
         Where p.Description = "term" _ 
         Select p 

     thisYear = get_Year.First.textValue 
     thisTerm = get_Term.First.textValue 
     getOccupants = From p In dbContext.Residents _ 
       Where p.semester = thisTerm _ 
       Where p.year = thisYear _ 
       Select p 

     Using dbPC 
      For Each row In getOccupants 
       Dim student_info = row 
       Dim people_id = student_info.people_code_id 
       Dim building_code = student_info.Building1.building_code 
       Dim room = student_info.Room1.room1 
       Dim PCstudent = From r In dbPC.RESIDENCies _ 
           Where r.PEOPLE_ID = people_id _ 
           Where r.ACADEMIC_YEAR = thisYear _ 
           Where r.ACADEMIC_TERM = thisTerm _ 
           Select r 

       For Each row2 In PCstudent 
        Dim student_info2 = row2 
        student_info2.DORM_BUILDING = building_code 
        student_info2.DORM_ROOM = room 
        student_info2.RESIDENT_COMMUTER = "R" 
        student_info2.DORM_CAMPUS = "O000000001" 
        dbPC.SaveChanges() 
       Next 
      Next 
     End Using 
    End Using 

End Sub 

Answer 1

首先，你要做的是儘可能最困難的方式（逐行更新代碼），而不是單一更新數據庫;說，沒有什麼看起來不正確的東西的表面上。您可能會檢查'dbPC.Residencies'的定義以確保其定義正確，並且您可能需要在「For Each」之前放置一個「if（PCStudent.Any（））」檢查，儘管它應該按照書面方式工作。