如何正确反序列化和映射它？

Question

我正在构建一个消耗 API 的 Dynamics CRM 插件，这是我的问题。当我得到这个 Json 字符串时，我可以轻松地进行映射。而且我可以正确调用它。

{
  "userId": 1,
  "id": 2,
  "title": "qui est esse",
  "body": "est rerum tempore vitae\nsequi sint nihil reprehenderit dolor beatae ea dolores neque\nfugiat blanditiis voluptate porro vel nihil molestiae ut reiciendis\nqui aperiam non debitis possimus qui neque nisi nulla"
}

我的代码：

public string callRestAPI()
        {
            var request = (HttpWebRequest)WebRequest.Create("https://jsonplaceholder.typicode.com/posts/2");
            request.Method = "GET";
            request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36";
            request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
            var response =(HttpWebResponse)request.GetResponse();
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
            string content = string.Empty;
            using (var stream = response.GetResponseStream())
            {
                using (var sr = new StreamReader(stream))
                {
                    return content = sr.ReadToEnd();
                }
            }
            throw new Exception($"api data is {content}");
        }

.. 映射

public class RootObject
        {
            public int userId { get; set; }
            public int id { get; set; }
            public string title { get; set; }
            public string body { get; set; }
        }

..现在我如何称呼它的示例

string Consume = callRestAPI();
 var Accs = JsonConvert.DeserializeObject<RootObject>(Consume);
                        try
                        {
                            Entity createcontact = new Entity("contact");
                            createcontact["firstname"] = "Joe";
                            createcontact["lastname"] = Accs.title;
                            createcontact["emailaddress1"] = "Joe.doe@gmail.com";

但是当我得到这种类型的字符串时，我对它感到困惑，而且我似乎无法正确地调用它。当我必须从第一个字符串 API 获取数据时，我的代码有效，但是当我更改为第二个 API 产生以下字符串时，我的代码不起作用，我只是感到困惑。

{
"data": {
    "id": 2,
    "email": "janet.weaver@reqres.in",
    "first_name": "Janet",
    "last_name": "Weaver",
    "avatar": "https://s3.amazonaws.com/uifaces/faces/twitter/josephstein/128.jpg"
}
}

Answer 1

您的第一个 json 片段：

{
  "userId": 1,
  "id": 2,
  "title": "qui est esse",
  "body": "est rerum tempore vitae\nsequi sint nihil reprehenderit dolor beatae ea dolores neque\nfugiat blanditiis voluptate porro vel nihil molestiae ut reiciendis\nqui aperiam non debitis possimus qui neque nisi nulla"
}

... 正确映射到 RootObject class.

但是，您的第二个 json 代表层级 :

{
   "data": {
       "id": 2,
       "email": "janet.weaver@reqres.in",
       "first_name": "Janet",
       "last_name": "Weaver",
       "avatar": "https://s3.amazonaws.com/uifaces/faces/twitter/josephstein/128.jpg"
   }
}

... 有根对象，然后是 data 对象，所以它不能映射到 RootObject （所以从语义上讲，它不应该被称为“RootObject"。

所以你有两个选择：

只需添加代表该层次结构的 class：

public class Response
{
    public RootObject data { get; set; }
}

... 然后：

JsonConvert.DeserializeObject<Response>(json);

或者，select 嵌套对象 json 仅：

string dataJson = JObject.Parse(json).SelectToken("data").ToString();
var data = JsonConvert.DeserializeObject<RootObject>(dataJson);

如何正确反序列化和映射它？

How can I deserialize and map this correctly?

c#

json

dynamics-crm