PostAsJsonAsync And Anonymous Types - 404 Not Found Errors - asp.net-mvc-4

Question

I've been unsuccessfully trying to get this working.
I'm using AttributeRouting on the API and I have this method defined on my WebAPI:
[POST("update"), JsonExceptionFilter]
public HttpResponseMessage PostUpdate([FromJson] long id, DateTime oriDt, string notes, int score)
When I try to call this with the following code:
using (var httpClient = new HttpClient(CreateAuthorizingHandler(AuthorizationState)))
{
var args = new { id, oriDt, notes, score };
var postData = new List<KeyValuePair<string, string>>();
postData.Add(new KeyValuePair<string, string>("id", id.ToString()));
postData.Add(new KeyValuePair<string, string>("oriDt", oriDt.ToString(_dateService.DefaultDateFormatStringWithTime)));
postData.Add(new KeyValuePair<string, string>("notes ", notes));
postData.Add(new KeyValuePair<string, string>("score ", score.ToString(CultureInfo.InvariantCulture)));
var response = httpClient.PostAsJsonAsync(ApiRootUrl + "update", postData).Result;
if (response.IsSuccessStatusCode)
{
var data = response.Content.ReadAsAsync<bool>().Result;
return data;
}
return null;
}
The response is always 404 - not found. What am I missing here? I've tried using an anonymous object called args in the code with the same issue.
I've also tried it with and witout the [FromJson] attribute as well with the same results.

Answer 1

First, remove [FromJson]. With that, you have this action method.
public HttpResponseMessage PostUpdate(long id, DateTime oriDt,
string notes, int score)
If you POST to the URI below, it will work.
/update/123?oridt=somedate&notes=somenote&score=89
If you want to use request body to POST the fields (as you are doing with the client code), declare a class containing properties with name same as the field in request body.
public class MyDto
{
public long Id { get; set; }
public DateTime OriDt { get; set; }
public string Notes { get; set; }
public int Score { get; set; }
}
Then change the action method like this.
public HttpResponseMessage PostUpdate(MyDto dto)