'Error converting value' 当 JSON DeserializeObject

Question

我有一段代码找不到问题所在。我正在使用 Visual Studio 2008 并使用 .Net CF 3.5 进行开发。

我收到以下 JSON 字符串：

[
  {
    "id": 1,
    "DbServerInstance": "Ej8/Pz9ubnldPx9ePxk=",
    "DbServerUser": "Px4/Ez8/Pz8/DT9OfBo=",
    "DbServerPassword": "TWsYRiQ/PyM/ZT8/PzJZ",
    "DbServerDatabase": "PwVRczpEPz8aPz8/DnRD",
    "UserManualURL": "Pz8rNUd2PxdAPzM/Uxw/Wg==",
    "ApplicationName": "PzwAAm5MTks/Pz0obD9P"
  }
]

我还创建了以下类:

public class JSONResponse{
    [JsonProperty(PropertyName = "id")]
    public int id { get; set; }

    [JsonProperty(PropertyName = "DbServerInstance")]
    public string dbServerInstance { get; set; }

    [JsonProperty(PropertyName = "DbServerUser")]
    public string dbServerUser { get; set; }

    [JsonProperty(PropertyName = "DbServerPassword")]
    public string dbServerPassword { get; set; }

    [JsonProperty(PropertyName = "DbServerDatabase")]
    public string dbServerDatabase { get; set; }

    [JsonProperty(PropertyName = "UserManualURL")]
    public string userManualURL { get; set; }

    [JsonProperty(PropertyName = "ApplicationName")]
    public string applicationName { get; set; }
}

public class JSONArray
{
    public IList<JSONResponse> Params { get; set; }
}

我尝试使用以下命令反序列化：

List<JSONResponse> rp = JsonConvert.DeserializeObject<List<JSONResponse>>(returnString);

这给我错误：

{"Error converting value \"[\r\n {\r\n \"id\": 1,\r\n \"DbServerInstance\": \ "Ej8/Pz9ubnldPx9ePxk=\",\r\n \"DbServerUser\": \"Px4/Ez8/Pz8/DT9OfBo=\",\r\n \"DbServerPassword\": \"TWsYRiQ/PyM/ZT8/PzJZ\",\r\n \ "DbServerDatabase\": \"PwVRczpEPz8aPz8/DnRD\",\r\n \"UserManualURL\": \"Pz8rNUd2PxdAPzM/Uxw/Wg==\",\r\n \"ApplicationName\": \"PzwAAm5MTks/Pz0obD9P\" \r\n }\r\n]\" 键入 'System.Collections.Generic.List`1[louisapp.JSONResponse]'。"} System.Exception {Newtonsoft.Json.JsonSerializationException}

我进行了搜索，但找不到问题所在，而且由于我对 JSON 还很陌生，所以我的知识有限。如有任何意见，我们将不胜感激。

编辑：调用网络的代码 api:

    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
    request.Method = "GET";
    request.ContentType = @"application/json";
    using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
    {
        if (response.StatusCode == HttpStatusCode.OK)
        {
            Stream stream = response.GetResponseStream();
            StreamReader sr = new StreamReader(stream);
            return sr.ReadToEnd();
        }
        else
        {
            return null;
        }
    }

Answer 1

看起来 returnString 的 json 格式不正确。查看异常 returnString 在开头和结尾有额外的双引号 \"[ ]\"

我试过同样的例子，它抛出了上面的异常

string returnString = "\"[\r\n {\r\n \"id\": 1,\r\n \"DbServerInstance\": \"Ej8/Pz9ubnldPx9ePxk=\",\r\n \"DbServerUser\": \"Px4/Ez8/Pz8/DT9OfBo=\",\r\n \"DbServerPassword\": \"TWsYRiQ/PyM/ZT8/PzJZ\",\r\n \"DbServerDatabase\": \"PwVRczpEPz8aPz8/DnRD\",\r\n \"UserManualURL\": \"Pz8rNUd2PxdAPzM/Uxw/Wg==\",\r\n \"ApplicationName\": \"PzwAAm5MTks/Pz0obD9P\"\r\n }\r\n]\"";

List<JSONResponse> rp = JsonConvert.DeserializeObject<List<JSONResponse>>(returnString);

删除附加引号后，它开始工作

string returnString = "[\r\n {\r\n \"id\": 1,\r\n \"DbServerInstance\": \"Ej8/Pz9ubnldPx9ePxk=\",\r\n \"DbServerUser\": \"Px4/Ez8/Pz8/DT9OfBo=\",\r\n \"DbServerPassword\": \"TWsYRiQ/PyM/ZT8/PzJZ\",\r\n \"DbServerDatabase\": \"PwVRczpEPz8aPz8/DnRD\",\r\n \"UserManualURL\": \"Pz8rNUd2PxdAPzM/Uxw/Wg==\",\r\n \"ApplicationName\": \"PzwAAm5MTks/Pz0obD9P\"\r\n }\r\n]";

List<JSONResponse> rp = JsonConvert.DeserializeObject<List<JSONResponse>>(returnString);

Answer 2

List<JSONResponse> rp =    jserial.Deserialize<List<JSONResponse>>(returnString);

试试这个对我们来说效果很好

'Error converting value' 当 JSON DeserializeObject

'Error converting value' when JSON DeserializeObject

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