如何使用 ASP.net 框架使用 API？

Question

Sample Json:

{
  "success": true,
  "status": 200,
  "data": [
    {
      "ProfileID": "1001",
      "Name": "Jane Doe",
      "HomePhone": "555-1212",
      "Address1": "123 Elm St"
    },
    {
      "ProfileID": "1002",
      "Name": "Rick Fox",
      "HomePhone": "555-1213",
      "Address1": "123 Ok St"
    }
  ]
}

My code so far:

using Newtonsoft.Json;

private void popGrid()
{
   var client = new HttpClient();
   client.BaseAddress = new Uri("http://the-api/");
   var responseTask = client.GetAsync("member-list");
   responseTask.Wait();
   var result = responseTask.Result;
   if (result.IsSuccessStatusCode)
   {
      var read_response = responseTask.Result.Content.ReadAsStringAsync();
      read_response.Wait();
      var read_result = read_response.Result;

      dynamic response = JsonConvert.DeserializeObject(read_result);
      var success = response.success;
      var status = response.status;
      var data = response.data;

      // List<Root> myDeserializedClass = JsonConvert.DeserializeObject<List<Root>>(data);

      if ((bool)success)
      {
         GridView1.DataSource = data;
         GridView1.DataBind();
      }
   }

}

public class Root
{
   public string ProfileID { get; set; }
   public string Name { get; set; }
   public string HomePhone { get; set; }
   public string Address1 { get; set; }
}

The Errors: If I run the code as written, it runs through all the way without issue. However when the page renders I get an ugly error:

    Type 'Newtonsoft.Json.Linq.JValue' in Assembly 'Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' is not marked as serializable.

Buried in the Stack Trace is one line that gives a clue(to me):

    [ArgumentException: Error serializing value '1001' of type 'Newtonsoft.Json.Linq.JValue.']

So then I the added the (commented) line that uses the Root class . However, if I un-comment that line and run the code, I get the following error:

    Microsoft.CSharp.RuntimeBinder.RuntimeBinderException: 'The best overloaded method match for 'Newtonsoft.Json.JsonConvert.DeserializeObject<System.Collections.Generic.List<Root>>(string)' has some invalid arguments'

The above error seems to indicate that JsonConvert.DeserializeObject won't accept the var 'data' as an input. Any thoughts would be greatly appreciated.

Answer 1

You can simplify the approach. Instead of trying to deserialize only part of the JSON, deserialize the whole thing into an object. Define an object structure which matches it:

public class Root
{
    public bool success { get; set; }
    public int status { get; set; }
    public IEnumerable<Profile> data { get; set; }
}

public class Profile
{
    public string ProfileID { get; set; }
    public string LastName { get; set; }
    public string FirstName { get; set; }
    public string HomePhone { get; set; }
}

Then deserialize the response into that:

var result = JsonConvert.DeserializeObject<Root>(read_result);

Then you can access the collection in that object:

GridView1.DataSource = result.data;

Answer 2

it is better to create async method , but if you can not , you have to fix your code

    var response = client.GetAsync(api).Result;
    if (response.IsSuccessStatusCode)
    {
     var json = response.Content.ReadAsStringAsync().Result;
     var jsonParsed=JObject.Parse(json);
     var success = jsonParsed["success"];
      var status = jsonParsed["status"];
      List<Root> data = jsonParsed["data"].ToObject<List<Root>>();
    
      //or in this case you don't need any custom classes at all

       DataTable data = jsonParsed["data"].ToObject<DataTable>();
      
    
      if ((bool)success)
      {
         GridView1.DataSource = data;
         GridView1.DataBind();
      }

     }