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MVC 3，VB.NET，RAZOR應用程序，使用EF。我在我的post函數中有一個問題，數據庫根本沒有更新......在db.savechanges（）中使用break我看看這個變量，所有正確的信息都包含在UpdateModel（）部分中。但沒有骰子的代碼執行，並沒有返回任何錯誤，所以一切看起來不錯，但當我看着數據庫表，它根本沒有改變，所有的舊值仍然存在..功能如下：使用EF模型數據庫不更新使用updateModel
<AcceptVerbs(HttpVerbs.Post)>
Function EditCourse(ByVal _eCourse As cours) As ActionResult
Dim id As Integer = _eCourse.course_id
Dim _filename As String = String.Empty
Dim _guid As String = String.Empty
Dim _count As Integer = 0
Dim _courseFiles As cours = db.courses.Where(Function(f) f.course_ref = _eCourse.course_ref).First
Dim _file1 As String = _courseFiles.handoutFile1
Dim _file2 As String = _courseFiles.handoutFile2
Dim _file3 As String = _courseFiles.handoutFile3
Dim _file4 As String = _courseFiles.handoutFile4
Dim _file5 As String = _courseFiles.handoutFile5
Dim _file6 As String = _courseFiles.handoutFile6
Dim _file7 As String = _courseFiles.handoutFile7
Dim _file8 As String = _courseFiles.handoutFile8
For Each File As String In Request.Files
_count += 1
Dim hpf As HttpPostedFileBase = TryCast(Request.Files(File), HttpPostedFileBase)
If hpf.ContentLength = 0 Then
Continue For
End If
Dim savedfileName As String = Path.Combine(AppDomain.CurrentDomain.BaseDirectory) + "\CourseHandouts\" + hpf.FileName
hpf.SaveAs(savedfileName)
_filename = hpf.FileName
Select Case _count
Case Is = 1
If Not String.IsNullOrWhiteSpace(_file1) Then
If Not String.Compare(_eCourse.handoutFile1, _file1) = 0 AndAlso Not String.IsNullOrWhiteSpace(_eCourse.handoutFile1) Then
Dim FileToDelete As String = Path.Combine(AppDomain.CurrentDomain.BaseDirectory) + "\CourseHandouts\" + _file1
If System.IO.File.Exists(FileToDelete) = True Then
System.IO.File.Delete(FileToDelete)
End If
End If
End If
_eCourse.handoutFile1 = _filename
Case Is = 2
If Not String.IsNullOrWhiteSpace(_file2) Then
If Not String.Compare(_eCourse.handoutFile2, _file2) = 0 AndAlso Not String.IsNullOrWhiteSpace(_eCourse.handoutFile2) Then
Dim FileToDelete As String = Path.Combine(AppDomain.CurrentDomain.BaseDirectory) + "\CourseHandouts\" + _file2
If System.IO.File.Exists(FileToDelete) = True Then
System.IO.File.Delete(FileToDelete)
End If
End If
End If
_eCourse.handoutFile2 = _filename
Case Is = 3
If Not String.IsNullOrWhiteSpace(_file3) Then
If Not String.Compare(_eCourse.handoutFile3, _file3) = 0 AndAlso Not String.IsNullOrWhiteSpace(_eCourse.handoutFile3) Then
Dim FileToDelete As String = Path.Combine(AppDomain.CurrentDomain.BaseDirectory) + "\CourseHandouts\" + _file3
If System.IO.File.Exists(FileToDelete) = True Then
System.IO.File.Delete(FileToDelete)
End If
End If
End If
_eCourse.handoutFile3 = _filename
Case Is = 4
If Not String.IsNullOrWhiteSpace(_file4) Then
If Not String.Compare(_eCourse.handoutFile4, _file4) = 0 AndAlso Not String.IsNullOrWhiteSpace(_eCourse.handoutFile4) Then
Dim FileToDelete As String = Path.Combine(AppDomain.CurrentDomain.BaseDirectory) + "\CourseHandouts\" + _file4
If System.IO.File.Exists(FileToDelete) = True Then
System.IO.File.Delete(FileToDelete)
End If
End If
End If
_eCourse.handoutFile4 = _filename
Case Is = 5
If Not String.IsNullOrWhiteSpace(_file5) Then
If Not String.Compare(_eCourse.handoutFile5, _file5) = 0 AndAlso Not String.IsNullOrWhiteSpace(_eCourse.handoutFile5) Then
Dim FileToDelete As String = Path.Combine(AppDomain.CurrentDomain.BaseDirectory) + "\CourseHandouts\" + _file5
If System.IO.File.Exists(FileToDelete) = True Then
System.IO.File.Delete(FileToDelete)
End If
End If
End If
_eCourse.handoutFile5 = _filename
Case Is = 6
If Not String.IsNullOrWhiteSpace(_file6) Then
If Not String.Compare(_eCourse.handoutFile6, _file6) = 0 AndAlso Not String.IsNullOrWhiteSpace(_eCourse.handoutFile6) Then
Dim FileToDelete As String = Path.Combine(AppDomain.CurrentDomain.BaseDirectory) + "\CourseHandouts\" + _file6
If System.IO.File.Exists(FileToDelete) = True Then
System.IO.File.Delete(FileToDelete)
End If
End If
End If
_eCourse.handoutFile6 = _filename
Case Is = 7
If Not String.IsNullOrWhiteSpace(_file7) Then
If Not String.Compare(_eCourse.handoutFile7, _file7) = 0 AndAlso Not String.IsNullOrWhiteSpace(_eCourse.handoutFile7) Then
Dim FileToDelete As String = Path.Combine(AppDomain.CurrentDomain.BaseDirectory) + "\CourseHandouts\" + _file7
If System.IO.File.Exists(FileToDelete) = True Then
System.IO.File.Delete(FileToDelete)
End If
End If
End If
_eCourse.handoutFile7 = _filename
Case Is = 8
If Not String.IsNullOrWhiteSpace(_file8) Then
If Not String.Compare(_eCourse.handoutFile8, _file8) = 0 AndAlso Not String.IsNullOrWhiteSpace(_eCourse.handoutFile8) Then
Dim FileToDelete As String = Path.Combine(AppDomain.CurrentDomain.BaseDirectory) + "\CourseHandouts\" + _file8
If System.IO.File.Exists(FileToDelete) = True Then
System.IO.File.Delete(FileToDelete)
End If
End If
End If
_eCourse.handoutFile8 = _filename
End Select
Next
UpdateModel(_eCourse)
db.SaveChanges()
Return RedirectToAction("CourseIndex")
End Function
任何想法，爲什麼這會出錯?????
VS心不是順心的.STATE部分，是說其不是成員xxxxxxxx.cours在所有...我有這條線現在閱讀db.courses（_eCourse.course_id）.State = EntityState.Modified和沒有骰子...應該指出，我試圖db.entry（_ecourse）等，它不採用Entry參數。進一步我不得不指定course_id，因爲它想要一個整數那裏.. – Skindeep2366 2012-03-09 05:52:38
我假設你使用ObjectContext而不是DbContext。你使用什麼版本的EF？如果它是一個新的對象，你必須'添加'它，一個現有的對象，你需要'附加修改'。我強烈建議安裝DbContext模板，因爲api比DbContext而不是ObjectContext更容易處理，但至少需要EF 4.0。這是一個使用ObjectContext更新的例子（請參閱更新方法）http://stackoverflow.com/questions/3594515/how-to-update-an-entity-in-entity-framework-4-net/3594608#3594608如果你需要使用dbcontext讓我知道一些方向。 – 2012-03-09 14:52:29