为什么我的WCF服务不会将值返回给客户端？

Question

我遇到问题，当我创建WCF服务时，我用wcftestclient.exe测试它，是的它返回一个就像我想要它的值

但是在winform中，它只是空白，这是我的代码

这是我的datacontract类（dcClient.vb）

Public Class dcClient
Private _userName As String
Private _password As String
Private _userLevel As String
Private _userStatus As String

Public Property userName As String
    Get
        Return _userName
    End Get
    Set(value As String)
        _userName = value
    End Set
End Property

Public Property password As String
    Get
        Return _password
    End Get
    Set(value As String)
        _password = value
    End Set
End Property

Public Property userLevel As String
    Get
        Return _userLevel
    End Get
    Set(value As String)
        _userLevel = value
    End Set
End Property

Public Property userStatus As String
    Get
        Return _userStatus
    End Get
    Set(value As String)
        _userStatus = value
    End Set
End Property

结束班

这是我的ServiceClient.vb

Public Function loginClient(ByVal userName As String, ByVal password As String) As dcClient Implements IServiceClient.loginClient
    Dim dcClients As New dcClient
    Dim conString = ConfigurationManager.ConnectionStrings("DBCS").ConnectionString
    Using con As New SqlConnection(conString)
        Dim cmd As New SqlCommand("spSelectMasterUser", con)
        cmd.CommandType = CommandType.StoredProcedure

        Dim parameteruserName As New SqlParameter
        parameteruserName.ParameterName = "@userName"
        parameteruserName.Value = userName
        cmd.Parameters.Add(parameteruserName)

        Dim parameterPassword As New SqlParameter
        parameterPassword.ParameterName = "@password"
        parameterPassword.Value = password
        cmd.Parameters.Add(parameterPassword)

        con.Open()

        Dim dtReader As SqlDataReader = cmd.ExecuteReader

        While dtReader.Read
            dcClients.userName = dtReader("userName").ToString
            dcClients.password = dtReader("password").ToString
            dcClients.userLevel = dtReader("userLevel").ToString
            dcClients.userStatus = dtReader("userStatus").ToString
        End While

    End Using

    Return dcClients
End Function

有我的服务代码，下面是我的客户代码

Private Sub btn_login_Click(sender As Object, e As EventArgs) Handles btn_login.Click
    Dim I_Sc As New Service_Ref.ServiceClientClient
    Dim dcClient As New Service_Ref.dcClient
    Try
        dcClient = I_Sc.loginClient("kevin", "kevin")
    Catch ex As Exception
        MessageBox.Show("Login Failed")
    End Try


    Dim username As String = dcClient.userName
    Dim userlevel As String = dcClient.userLevel
    Dim userstatus As String = dcClient.userStatus

    Label4.Text = username
    Label5.Text = userlevel
    Label6.Text = userstatus


End Sub

在wcftestclient中，当我输入＆＃34; kevin＆＃34;，＆＃34; kevin＆＃34; （那是我的数据库记录），我返回我需要的全部值。但是当我在客户端执行按钮时，它返回空白，没有...我想念的是什么？