尝试调用 API 时出现 System.Threading.Tasks 错误

Question

我是 vb.net 代码的新手。我必须从 vb.net 调用外部 API。我尝试了下面的代码，但它抛出了一个错误 - 将问题作为

<块引用>

System.Threading.Tasks.k`1

Public Shared Async Function GetToken_saka() As Task(Of sakaweb)
    Dim req As New HttpRequestMessage(HttpMethod.Post, "https://api.qa.se.com/token")
    '        req.Content = New FormUrlEncodedContent(New Dictionary < String, String > {
    '    {"client_id", "your client_id"},
    '    {"client_secret", "your client_secret"},
    '    {"grant_type", "client_credentials"}
    '});

    Dim dct As New Dictionary(Of String, String)
    dct.Add("client_id", "your_client_id")
    dct.Add("client_secret", "your_client_secret")
    dct.Add("grant_type", "client_credentials")

    Dim htc As New HttpClient
    req.Content = New FormUrlEncodedContent(dct)
    Dim response = Await htc.SendAsync(req)
    response.EnsureSuccessStatusCode()

    'Dim payload = JObject.Parse(Await response.Content.ReadAsStringAsync())
    Dim payload = JsonConvert.DeserializeObject(response.ToString)

    Dim token = payload.Value(Of String)("access_token")
    Dim t1 As sakaweb = Nothing
    Return t1

    'Dim t1 As New Task("K")
    'Return t1
End Function