Restsharp中json对象的反序列化

我有以下使用RestSharp调用web服务的代码。代码运行时没有错误，但是当我查看response.Data时，我发现Result对象没有反序列化，仍然包含默认值

<Serializable()> <DataContract()> _
Private Class Result
  <DataMember(IsRequired:=False)> _
  Public responseCode As Long
  <DataMember(IsRequired:=False)> _
  Public responseMessage As String
  Friend Const RESULT_OK As Long = 2000
End Class

Private Function Login(ByVal user As String, ByVal password As String) As  RestResponseCookie
  Dim req As New RestRequest("authenticationService/authentication/signIn", Method.POST)
  req.RequestFormat = DataFormat.Json
  Dim input As New SigninInput
  input.requestParameters.username = user
  input.requestParameters.password = password
  req.AddBody(input)

  Dim response As RestResponse(Of Result) = getRestClient().Execute(Of Result)(req)
  If response.StatusCode = HttpStatusCode.OK Then
    Dim res As Result = response.Data
  End If
  Return Nothing
End Function

反序列化运行得很好。 我试着调试代码的非工作版本的结果，内容看起来很好。这是我得到的内容：“{”responseMessage:“成功：您的请求已成功完成。”，“responseCode:2000}”，内容类型应该是“application/json”

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我可以运行有效的代码，但是我很乐意知道为什么RestSharp的反序列化没有正确进行。

RestSharp没有反序列化到字段，您必须将它们更改为属性，然后它应该可以工作

  Dim response As RestResponse = getRestClient().Execute(req)
  If response.StatusCode = HttpStatusCode.OK Then
    Dim des As New Json.DataContractJsonSerializer(GetType(Result))
    Dim res As Result = CType(des.ReadObject(New IO.MemoryStream(response.RawBytes)), Result)
  End If