c# – 无法反序列化JSON数组到类型 – Json.NET
发布时间:2020-12-15 06:25:03 所属栏目:百科 来源:网络整理
导读:我试图将一个json数据反序列化为一个模型类,但是我失败了.这是我做的: public CountryModel GetCountries() { using (WebClient client = new WebClient()) { var result = client.DownloadString("http://api.worldbank.org/incomeLevels/LIC/countries?fo
我试图将一个json数据反序列化为一个模型类,但是我失败了.这是我做的:
public CountryModel GetCountries() { using (WebClient client = new WebClient()) { var result = client.DownloadString("http://api.worldbank.org/incomeLevels/LIC/countries?format=json"); var output = JsonConvert.DeserializeObject<List<CountryModel>>(result); return output.First(); } } 这是我的模型如何: public class CountryModel { public int Page { get; set; } public int Pages { get; set; } public int Per_Page { get; set; } public int Total { get; set; } public List<Country> Countries { get; set; } } public class Country { public int Id { get; set; } public string Iso2Code { get; set; } public string Name { get; set; } public Region Region { get; set; } } public class Region { public int Id { get; set; } public string Value { get; set; } } 你可以看到Json我到了这里:http://api.worldbank.org/incomeLevels/LIC/countries?format=json 这是我得到的错误:
解决方法
你必须编写一个自定义JsonConverter:
public class CountryModelConverter : JsonConverter { public override bool CanConvert(Type objectType) { if (objectType == typeof(CountryModel)) { return true; } return false; } public override object ReadJson(JsonReader reader,Type objectType,object existingValue,JsonSerializer serializer) { reader.Read(); //start array //reader.Read(); //start object JObject obj = (JObject)serializer.Deserialize(reader); //{"page":1,"pages":1,"per_page":"50","total":35} var model = new CountryModel(); model.Page = Convert.ToInt32(((JValue)obj["page"]).Value); model.Pages = Convert.ToInt32(((JValue)obj["pages"]).Value); model.Per_Page = Int32.Parse((string) ((JValue)obj["per_page"]).Value); model.Total = Convert.ToInt32(((JValue)obj["total"]).Value); reader.Read(); //end object model.Countries = serializer.Deserialize<List<Country>>(reader); reader.Read(); //end array return model; } public override void WriteJson(JsonWriter writer,object value,JsonSerializer serializer) { throw new NotImplementedException(); } } 并用该转换器标记CountryModel(我也必须将一些int转换为字符串): [JsonConverter(typeof(CountryModelConverter))] public class CountryModel { public int Page { get; set; } public int Pages { get; set; } public int Per_Page { get; set; } public int Total { get; set; } public List<Country> Countries { get; set; } } public class Country { public string Id { get; set; } public string Iso2Code { get; set; } public string Name { get; set; } public Region Region { get; set; } } public class Region { public string Id { get; set; } public string Value { get; set; } } 那么你应该能够像这样反序列化: var output = JsonConvert.DeserializeObject<CountryModel>(result); (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |