How can I loop Json with dynamic type in .netcore 1.1?

Question

I have passed Json object though Postman. And I have no idea how can I loop this with .NetCore 1.1 Web Service.

Json Object passed by Postman:

{
 [
  {"id":"1","name":"Peter"}
  ,
  {"id":"2","name":"Mary"}
 ]
}

.net core 1.1 coding:

[HttpPut]
[Route("all")]
public IActionResult UpdateName([FromBody] dynamic JSON){
  var RootObjects = JsonConvert.DeserializeObject<List<RootObject>>(JSON);
  foreach (var x in RootObjects){
   // do something here...
  }
}

RootObjects:

private class RootObject
{
    public string id { get; set; }
    public string name { get; set; }
}

And I get error below:

System.ArgumentNullException: Value cannot be null.\r\nParameter name: value\r\n at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings)\r\n at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings)\r\n at CallSite.Target(Closure , CallSite , Type , Object )\r\n

Winter · Accepted Answer · 2019-05-06 03:57:57Z

1

Maybe your json is invalid.Change your json string to:

 [
  {"id":"1","name":"Peter"},
  {"id":"2","name":"Mary"}
 ]

And change your controller action to:

   [HttpPut]
    public IActionResult Test([FromBody] List<RootObject> list)
    {
        foreach (var item in list)
        {
            Console.WriteLine(item.name);
        }

        return Json("ok");
    }

And also the RootObject class need to Public:

     public class RootObject
     {
       public string id { get; set; }
       public string name { get; set; }
     }

Use the postman put string in Content-Type:application/json. And i saw the correct result.

edited May 6, 2019 at 3:57

answered May 6, 2019 at 3:19

Winter

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