FtpWebRequest/FtpWebResponse : 连接成功后即使提供了错误的密码也连接成功答案

【问题标题】：FtpWebRequest/FtpWebResponse : connection is successful even if a bad password is provided after a successful connectionFtpWebRequest/FtpWebResponse : 连接成功后即使提供了错误的密码也连接成功
【发布时间】：2013-05-21 14:16:32
【问题描述】：

我正在使用用户提供的用户/密码测试 FTP 连接。

如果我独立运行单元测试，一切正常。但是如果我尝试有序测试，在FTP_Test_Unsuccessful 之前运行FTP_Test_Sucessful，FTP_Test_Unsuccessful 测试失败：即使我提供了错误的密码，FTP 连接也是成功的。

Passed          Unit Test   FTP_Test_Unsuccessful       00:00:02.3566157
Passed          Unit Test   FTP_Test_Sucessful          00:00:00.3048244
Failed          Unit Test   FTP_Test_Unsuccessful       00:00:00.2696941
Not Executed    Unit Test   FTP_Test_Sucessful          00:00:00

我如何“重置”FTP 连接，以便FTP_Test_Unsuccessful 实际正确测试连接。

这是我的单元测试：

'''<summary>
'''basic Unsuccessful FTP test
'''</summary>
<TestMethod()>
Public Sub FTP_Test_Unsuccessful()
    _TestSettings.FTPEnabled = True
    _TestSettings.ChangeFTPCredentials("User", "BadPasword")
    Try
        Assert.IsFalse(_TestSettings.TestFtpSettings())

    Catch ex As AssertFailedException
        Throw 

    Catch ex As Net.WebException
        Dim FTPResponse As FtpWebResponse = DirectCast(ex.Response, FtpWebResponse)
        Assert.AreEqual(FtpStatusCode.NotLoggedIn, FTPResponse.StatusCode)

    Catch ex As Exception
        Assert.Fail()
    End Try
End Sub

'''<summary>
'''basic Sucessful FTP test
'''</summary>
<TestMethod()>
Public Sub FTP_Test_Sucessful()
    _TestSettings.FTPEnabled = True
    _TestSettings.ChangeFTPCredentials("User", "GoodPasword")
    Assert.IsTrue(_TestSettings.TestFtpSettings())
End Sub

这里是相关代码：

Public Function TestFtpSettings() As Boolean
    Dim FTPConnectionTestedSuccessfully As Boolean = False
    Dim response As FtpWebResponse = GetTestFtpResponse()
    Dim StatusCode As System.Net.FtpStatusCode = response.StatusCode
    response.Close()
    FTPConnectionTestedSuccessfully = (StatusCode = Net.FtpStatusCode.OpeningData)

    Return FTPConnectionTestedSuccessfully
End Function

Private Function GetTestFtpResponse() As FtpWebResponse
    Dim request As FtpWebRequest = GetFTPConnection(WebRequestMethods.Ftp.ListDirectory)
    Dim response As FtpWebResponse = GetFTPResponse(request)

    Return (response)
End Function

Private Function GetFTPConnection(Method As String) As FtpWebRequest
    'Get the object used to communicate with the server.

    Dim FTPAdress As Uri = New Uri(String.Format("ftp://{0}:{1}", _
                                                 Me.FTPServerName, _
                                                 Me.FTPPort))

    Dim request As FtpWebRequest = DirectCast(WebRequest.Create(FTPAdress),  _
                                              FtpWebRequest)

    request.Method = Method
    request.Credentials = New NetworkCredential(Me.FTPUserName,
                                                Me.GetDecryptedPassword)
    Return request
End Function

Public Function GetFTPResponse(request As FtpWebRequest) As FtpWebResponse
    Return DirectCast(request.GetResponse(), FtpWebResponse)
End Function

【问题讨论】：

标签： .net vb.net .net-4.0 ftpwebrequest

【解决方案1】：

感谢How to Reuse FtpWebRequest Connection 上的这个答案，我刚刚将request.KeepAlive = False 添加到我的GetFTPConnection 函数中。并且所有测试都通过了。

Private Function GetFTPConnection(Method As String) As FtpWebRequest
    'Get the object used to communicate with the server.

    Dim FTPAdress As Uri = New Uri(String.Format("ftp://{0}:{1}", _
                                                 Me.FTPServerName, _
                                                 Me.FTPPort))

    Dim request As FtpWebRequest = DirectCast(WebRequest.Create(FTPAdress),  _
                                              FtpWebRequest)

    request.Method = Method
    request.KeepAlive = False
    request.Credentials = New NetworkCredential(Me.FTPUserName,
                                                Me.GetDecryptedPassword)
    Return request
End Function

【讨论】：