c# - JsonConvert.DeserializeObject 在 .net 中不起作用

Question

我没有让 JsonConvert.DeserializeObject 为我工作。我从服务中获得了正确的 JSON 值。在网上找不到任何东西，希望能在这里得到一点帮助:)

这是我的代码:

public partial class _Default : Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void tbPlate_OnServerChange(object sender, EventArgs e)
    {
        if (!string.IsNullOrEmpty(tbPlate.Text))
        {
            var _res = Responses(tbPlate.Text);

            if (_res.Vehicles != null)
            {
                lblTestText.Text = _res.Vehicles.FirstOrDefault(r => r.regNr == tbPlate.Text)?.ToString();
            }
            else
            {
                lblTestText.Text = "No vehicle data"; 
            }
        }
    }

    private static VehicleResults Responses(string regNr)
    {
        var _jSon = "";
        var _url = @"http://apis.is/car";
        var _res = new VehicleResults();

        var _request = (HttpWebRequest)WebRequest.Create($"{_url}?number={regNr}");

        var _response = _request.GetResponse();

        using (var _responseStream = _response.GetResponseStream())
        {
            var _reader = new StreamReader(_responseStream, Encoding.UTF8);
            _jSon = _reader.ReadToEnd();
        }

        _res = JsonConvert.DeserializeObject<VehicleResults>(_jSon);
        return _res;
    }
}

public class VehicleResponse
{
    [JsonProperty("registryNumber")]
    public string regNr { get; set; }
    public string number { get; set; }
    public string factoryNumber { get; set; }
    public string type { get; set; }
    public string subType { get; set; }
    public string color { get; set; }
    public string registeredAt { get; set; }
    public string status { get; set; }
    public string nextCheck { get; set; }
    public string pollution { get; set; }
    public string weight { get; set; }
}

public class VehicleResults
{
    public List<VehicleResponse> Vehicles { get; set; }
}

这是来自服务的响应 JSON:

{"results":[{"type":"MERCEDES BENZ - M (Svartur)","subType":"M","color":"Svartur","registryNumber":"GXS56","number":"GXS56","factoryNumber":"WDC1631131A539035","registeredAt":"23.09.2004","pollution":" g/km","weight":"2200 kg","status":"Í lagi","nextCheck":"01.06.2019"}]}

我对 REST 服务很陌生，所以我认为这个问题很小....我现在无法弄清楚。

Answer 1

您的 json 有一个根对象，其中包含您的车辆列表。
您需要使用 json 中返回的名称来命名保存列表的变量。 结果

public class VehicleResults
{
    // This should be named results
    public List<VehicleResponse> results {get;set;}
}

现在你可以反序列化

VehicleResults data = JsonConvert.DeserializeObject<VehicleResults>(json);
foreach(var vei in data.results)
   Console.WriteLine(vei.type);