无法将当前 JSON 对象反序列化为类型，因为该类型需要 JSON 数组

Question

我是 C# 中 JSON 字符串处理的新手，在尝试反序列化 JSON 字符串时遇到以下错误：

Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[Formula1Info.Models.clsMRData]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.
To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List<T>) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.
Path 'MRData.xmlns', line 1, position 19.

JSON 字符串是：

{"MRData":{"xmlns":"http:\/\/ergast.com\/mrd\/1.5","series":"f1","url":"http://ergast.com/api/f1/1952.json","limit":"30","offset":"0","total":"8","RaceTable":{"season":"1952","Races":[{"season":"1952","round":"1","url":"http:\/\/en.wikipedia.org\/wiki\/1952_Swiss_Grand_Prix","raceName":"Swiss Grand Prix","Circuit":{"circuitId":"bremgarten","url":"http:\/\/en.wikipedia.org\/wiki\/Circuit_Bremgarten","circuitName":"Circuit Bremgarten","Location":{"lat":"46.9589","long":"7.40194","locality":"Bern","country":"Switzerland"}},"date":"1952-05-18"},{"season":"1952","round":"2","url":"http:\/\/en.wikipedia.org\/wiki\/1952_Indianapolis_500","raceName":"Indianapolis 500","Circuit":{"circuitId":"indianapolis","url":"http:\/\/en.wikipedia.org\/wiki\/Indianapolis_Motor_Speedway","circuitName":"Indianapolis Motor Speedway","Location":{"lat":"39.795","long":"-86.2347","locality":"Indianapolis","country":"USA"}},"date":"1952-05-30"},{"season":"1952","round":"3","url":"http:\/\/en.wikipedia.org\/wiki\/1952_Belgian_Grand_Prix","raceName":"Belgian Grand Prix","Circuit":{"circuitId":"spa","url":"http:\/\/en.wikipedia.org\/wiki\/Circuit_de_Spa-Francorchamps","circuitName":"Circuit de Spa-Francorchamps","Location":{"lat":"50.4372","long":"5.97139","locality":"Spa","country":"Belgium"}},"date":"1952-06-22"},{"season":"1952","round":"4","url":"http:\/\/en.wikipedia.org\/wiki\/1952_French_Grand_Prix","raceName":"French Grand Prix","Circuit":{"circuitId":"essarts","url":"http:\/\/en.wikipedia.org\/wiki\/Rouen-Les-Essarts","circuitName":"Rouen-Les-Essarts","Location":{"lat":"49.3306","long":"1.00458","locality":"Rouen","country":"France"}},"date":"1952-07-06"},{"season":"1952","round":"5","url":"http:\/\/en.wikipedia.org\/wiki\/1952_British_Grand_Prix","raceName":"British Grand Prix","Circuit":{"circuitId":"silverstone","url":"http:\/\/en.wikipedia.org\/wiki\/Silverstone_Circuit","circuitName":"Silverstone Circuit","Location":{"lat":"52.0786","long":"-1.01694","locality":"Silverstone","country":"UK"}},"date":"1952-07-19"},{"season":"1952","round":"6","url":"http:\/\/en.wikipedia.org\/wiki\/1952_German_Grand_Prix","raceName":"German Grand Prix","Circuit":{"circuitId":"nurburgring","url":"http:\/\/en.wikipedia.org\/wiki\/N%C3%BCrburgring","circuitName":"Nürburgring","Location":{"lat":"50.3356","long":"6.9475","locality":"Nürburg","country":"Germany"}},"date":"1952-08-03"},{"season":"1952","round":"7","url":"http:\/\/en.wikipedia.org\/wiki\/1952_Dutch_Grand_Prix","raceName":"Dutch Grand Prix","Circuit":{"circuitId":"zandvoort","url":"http:\/\/en.wikipedia.org\/wiki\/Circuit_Zandvoort","circuitName":"Circuit Park Zandvoort","Location":{"lat":"52.3888","long":"4.54092","locality":"Zandvoort","country":"Netherlands"}},"date":"1952-08-17"},{"season":"1952","round":"8","url":"http:\/\/en.wikipedia.org\/wiki\/1952_Italian_Grand_Prix","raceName":"Italian Grand Prix","Circuit":{"circuitId":"monza","url":"http:\/\/en.wikipedia.org\/wiki\/Autodromo_Nazionale_Monza","circuitName":"Autodromo Nazionale di Monza","Location":{"lat":"45.6156","long":"9.28111","locality":"Monza","country":"Italy"}},"date":"1952-09-07"}]}}}

我通过这段代码反序列化它：

var  jF1Season = JsonConvert.DeserializeObject<Root>(strJSON);

class结构是：

public class Root
    {
        public List<clsMRData> MRData { get; set; }
    }
    public class clsMRData
    {
        public string xmlns { get; set; }
        public string series { get; set; }
        public string url { get; set; }
        public string limit { get; set; }
        public string offset { get; set; }
        public string total { get; set; }
        public List<clsRaceTable> RaceTable { get; set; }
    }

    public class clsRaceTable
    {
        public string season { get; set; }
        public List<clsRace> Races { get; set; }
    }

    public class clsRace
    {
        public string season { get; set; }
        public string round { get; set; }
        public string url { get; set; }
        public string raceName { get; set; }
        public List<clsCircuit> Circuit { get; set; }
        public string date { get; set; }
        public string time { get; set; }
    }

    public class clsCircuit
    {
        public string circuitId { get; set; }
        public string url { get; set; }
        public string circuitName { get; set; }
        public List<clsLocation> Location { get; set; }
    }

    public class clsLocation
    {
        public string lat { get; set; }
        [JsonProperty(PropertyName = "Root.MRData.RaceTable.Races.Circuit.Location.long")]
        public string lon { get; set; }
        public string locality { get; set; }
        public string country { get; set; }
    }

我想这个错误与我如何设置这个结构有关，但不明白为什么，所以如果能帮助解决这个错误，我们将不胜感激。

Answer 1

您的 code.Replace List 、 List 、 List 以及 clsRaceTable、clsCircuit 和 clsLocation 中存在多个错误。你的类应该是

public class Root
{
    public clsMRData MRData { get; set; }
}
public class clsMRData
{
    public string xmlns { get; set; }
    public string series { get; set; }
    public string url { get; set; }
    public string limit { get; set; }
    public string offset { get; set; }
    public string total { get; set; }
    public clsRaceTable RaceTable { get; set; }
}

public class clsRaceTable
{
    public string season { get; set; }
    public List<clsRace> Races { get; set; }
}

public class clsRace
{
    public string season { get; set; }
    public string round { get; set; }
    public string url { get; set; }
    public string raceName { get; set; }
    public clsCircuit Circuit { get; set; }
    public string date { get; set; }
    public string time { get; set; }
}

public class clsCircuit
{
    public string circuitId { get; set; }
    public string url { get; set; }
    public string circuitName { get; set; }
    public clsLocation Location { get; set; }
}

public class clsLocation
{
    public string lat { get; set; }
    [JsonProperty(PropertyName = "long")]
    public string lon { get; set; }
    public string locality { get; set; }
    public string country { get; set; }
}

无法将当前 JSON 对象反序列化为类型，因为该类型需要 JSON 数组

Cannot deserialize the current JSON object into type because the type requires a JSON array

c#

json

serialization