Receive PostAsync in FromBody as parameter

I am trying to read a JSON string from a web API controller that is sent via a method HttpClient.PostAsync()

. But for some reason, RequestBody

always null

.

My request looks like this:

public string SendRequest(string requestUrl, StringContent content, HttpMethod httpMethod)
{
    var client = new HttpClient { BaseAddress = new Uri(ServerUrl) };
    var uri = new Uri(ServerUrl + requestUrl); // http://localhost/api/test

    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json")); 

    HttpResponseMessage response;
    response = client.PostAsync(uri, content).Result;

    if (!response.IsSuccessStatusCode)
    {
        throw new ApplicationException(response.ToString());
    }

    string stringResult = response.Content.ReadAsStringAsync().Result;
    return stringResult;
}

      

        
        
        
      

    

I am calling this method like this

var content = new StringContent(JsonConvert.SerializeObject(testObj), Encoding.UTF8, "application/json");
string result = Request.SendRequest("/api/test", content, HttpMethod.Post);

      

        
        
        
      

    

Now my Web API method is currently reading the submit data like this:

[HttpPost]
public string PostContract()
{
    string httpContent = Request.Content.ReadAsStringAsync().Result;
    return httpContent;
}

      

        
        
        
      

    

This works great. The property stringResult

contains the string returned by the controller method. But I would like my controller method to be as follows:

[HttpPost]
public string PostContract([FromBody] string httpContent)
{
    return httpContent;
}

      

        
        
        
      

    

The request seems to work when received 200 - OK

, but stringResult

from the method SendRequest

always null

.

Why isn't the method in which I use the RequestBody

as parameter being used ?