Question

我正在按照其他post中描述的方法来存储和检索MSSQL 2008数据库中的任何文件。一切正常，除非我尝试将文件保存到磁盘上的任何位置，我得到UnauthorizedAccessException。以下是迄今为止所做的事情

将路径硬编码为“C：\ Temp”和“D：\” - UnauthorizedAccessException
尝试以管理员身份运行build .exe - 程序意外关闭

有人能指出我正确的方向解决这个问题吗？

我在Windows 8上，这是我正在使用的代码;

Public Sub downloadLearningObject(learningObjectID As Integer, folderPath As String) Implements ILearningObjectDAO.downloadLearningObject
    Dim connection As String = DatabaseConnection.ConnectionString
    Using con As New SqlConnection(connection)
        con.Open()
        Dim selectQuery As String = "SELECT File From LearningObject WHERE LearningObjectID=" & learningObjectID

        Dim cmd As New SqlCommand(selectQuery, con)
        Using sqlQueryResult = cmd.ExecuteReader()
            If sqlQueryResult IsNot Nothing Then
                sqlQueryResult.Read()
                Dim blob = New [Byte]((sqlQueryResult.GetBytes(0, 0, Nothing, 0, Integer.MaxValue)) - 1) {}
                sqlQueryResult.GetBytes(0, 0, blob, 0, blob.Length)

                'the following line is producing the exception
                Using fs = New FileStream(folderPath, FileMode.OpenOrCreate, FileAccess.ReadWrite) 
                    fs.Write(blob, 0, blob.Length)
                End Using
            End If
        End Using

    End Using
End Sub

Answer 1

我发现我的＆＃34;路径＆＃34;的格式化字符串是错误的。它必须是＆＃34; C：\ Temp \＆＃34;而不是＆＃34; C：\ Temp＆＃34;。字符串末尾缺少反斜杠触发了异常。

VB.NET - 尝试将文件写入驱动器时出现UnauthorizedAccessException

1 个答案: