How do we create JSON object [FromBody] and postasync to another api from existing webapi? [duplicate]

Question

Lets say I have Employee object coming from client via Post and we receive it in Webapi via [FromBody] attribute.

May I know, how to transfer this object by converting to Json again and posting it to another webapi? The response from this will be integer value. Which I will sending back to the client.

Also, I am trying to make this as Asynchronous.

I tried searching various sites and posts for hours and could not reach to a solution.

Appreciate your help :) Thanks.

[HttpPost]
public Task<ActionResult<int>> GetValue([FromBody] Employee emp)
{
}

"May I know, how to transfer this object by converting to Json again and posting it to another webapi?" - have you done any research on this? Sending an object via JSON is an incredibly common task, so there are many existing questions on this site doing exactly this. — ProgrammingLlama
– ProgrammingLlama, Commented Sep 4, 2019 at 2:56
Yes John I did my research, I understand, back in the days I even tried using DataContractJsonSerializer in WCF and it used to work fine. I tried few things but those assemblies are not compatible in Web Api project. I am clueless. I tried something like this, using (var client = new HttpClient()) { var mediaType = new MediaTypeHeaderValue("application/json"); var jsonserializerSettings = new JsonSerializerSettings(); JsonNetFormatter won't resolve -- > //var jsonFormatter = new JsonNetFormatter(jsonserializerSettings.Add()); — OptimusPrime
– OptimusPrime, Commented Sep 4, 2019 at 3:01
The first Google result for the query "how to post JSON to a server in C#" yields this question, from which I reckon this is a good answer. Note the section comment about using HttpClientFactory instead of using (var client = new HttpClient()) everywhere. — ProgrammingLlama
– ProgrammingLlama, Commented Sep 4, 2019 at 3:03
No John, perhaps you are right, I am looking for using client.PostAsync method example. I will be using the Task<ActionResult<int>> here — OptimusPrime
– OptimusPrime, Commented Sep 4, 2019 at 3:10

cdev · Accepted Answer · 2019-09-04 03:05:58Z

1

You can use Newtonsoft.Json to convert object into json.

using Newtonsoft.Json;

var jsonString = JsonConvert.SerializeObject(emp);

Then you call your external web api using httpClient or use HttpClientFactory

using (var client = new HttpClient())
{
    client.BaseAddress = new Uri("url");
    var result = await client.PostAsync("/endpoint", jsonString);

    // use below as you want
    string resultContent = await result.Content.ReadAsStringAsync();
}

answered Sep 4, 2019 at 3:05

cdev

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2 Comments

OptimusPrime Over a year ago

Mate, that's not correct, jsonstring is not HttpContent, in PostAsync, Httpcontent object is expected as second parameter.

Junaid Over a year ago

@OptimusPrime kindly mention the correct way.

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