c# - WCF HttpPost 不是有效的 json 字符串

Question

我正在尝试从网站调用我的 WCF 服务上的 POST 方法。然而，WCF 服务提示 json 字符串无效。

WCF 服务方法:

[WebInvoke(Method = "POST", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, UriTemplate = "reserve/batteries", BodyStyle = WebMessageBodyStyle.Bare)]
public bool ReserveBatteries(ReserveModel values)

从网站调用 POST 的方法:

var stations = TempData["Stations"];
string jsonStations = JsonHelper.SerializeJson(stations);

HttpWebRequest httpWReq = (HttpWebRequest)WebRequest.Create("http://localhost:49288/reserve/batteries");

UTF8Encoding encoding = new UTF8Encoding();
string postData = "{\"Stations\": " + jsonStations;
postData += ", \"User\": \"" + User.Identity.Name + "\" }";
byte[] data = encoding.GetBytes(postData);

httpWReq.Method = "POST";
httpWReq.ContentType = "application/json; charset=utf-8";
httpWReq.ContentLength = data.Length;

using (Stream stream = httpWReq.GetRequestStream())
{
      stream.Write(data, 0, data.Length);
}

HttpWebResponse response = (HttpWebResponse)httpWReq.GetResponse();

string responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();

我正在使用 Newtonsoft json 库进行序列化。 我尝试发送到我的服务的 json 字符串是:

{
    "Stations": [
        {
            "BatteryStorages": null,
            "CreatedDate": "2013-06-06T00:00:00+02:00",
            "Description": "Aalborg City",
            "Edges": [],
            "ID": 3,
            "IsActive": true,
            "IsOperational": true,
            "Reservations": [],
            "StationLat": 57.02881,
            "StationLong": 9.91777,
            "StationMaintenances": [],
            "StationType": null,
            "Title": "Aalborg",
            "TypeId": 1,
        }
    ],
    "User": "user1"
}

我已经用 JsonLint 验证了这一点它说这是一个有效的字符串。

WCF 接受的无效字符串(根据 JsonLint):

{
    "Stations": "[
         {
             BatteryStorages:null,
             CreatedDate:\"/Date(1370469600000+0200)/\",
             Description:\"Aalborg City\",
             Edges:[],
             ID:\"3\",
             IsActive:\"true\",
             IsOperational:\"true\",
             Reservations:[],
             StationLat:\"57.02881\",
             StationLong:\"9.91777\",
             StationMaintenances:[],
             StationType:null,
             Title:\"Aalborg\",
             TypeId:\"1\"
         }
     ]",
     "User": "user1"
}

WCF抛出的异常:

There was an error deserializing the object of type RestfulAPI.Resources.ReserveModel. End element 'Stations' from namespace '' expected. Found element 'item' from namespace ''.

这怎么可能？为什么 WCF 提示它无效，而 jsonlint(和其他人)说它无效。

编辑:

[DataContract]
public class ReserveModel
{
    [DataMember]
    public string Stations { get; set; }
    [DataMember]
    public string User { get; set; }
}

Answer 1

问题是您的模型对象的格式不正确。

要从您的 JSON 创建正确的 JSON 类，您可以使用 json2csharp或者如果你有，例如 VS2012 更新 2，你可以复制你的 JSON 并将 JSON 粘贴为类(编辑 ->选择性粘贴 > 将 JSON 粘贴为类)。

您必须记住，例如 DateTime 对象必须以 WCF 支持的某种方式传递。有关这方面的更多信息，请参见 here (msdn - WCF JSON serialization) .要避免这个问题，您只需将变量键入字符串并在以后转换它。

希望这对您有所帮助!