Jamie Jamie - 11 months ago 224
JSON Question

Returning HttpResponseMessage from MVC HttpPost, with content of JSON

My first post on StackOverflow but I am a long time lurker! Hopefully I canget some help on an issue I'm working on.

I am trying to achieve the following. The code below is setting the content to be a JSON string which contains the following...

"access_token": "value1",
"expires_in": "value2",
"client_in": null,
"scope": "value3"

and here is the code which sends the HttpResponseMessage back to the client.

public HttpResponseMessage token(string grant_type,
string code,
string client_id,
string client_secret,
string redirect_uri)
WpOAuth2TokenRetValSuccessVM OA2_Success = new WpOAuth2TokenRetValSuccessVM();

OA2_Success.access_token = "value1";
OA2_Success.client_in = client_id;
OA2_Success.expires_in = "value2"; //...The number of seconds left in the lifetime of the token
OA2_Success.scope = "value3"; //...Each access token can have only 1 scope

HttpResponseMessage response = new HttpResponseMessage();
response.StatusCode = HttpStatusCode.OK;
string strJson = JsonConvert.SerializeObject(OA2_Success, Newtonsoft.Json.Formatting.Indented);

StringContent n = new StringContent(strJson, Encoding.UTF8, "application/json");
response.Content = n;

return response;

Now then, on the client side for the life of me I cannot get the JSON string back out of the content. Here is the code that I am using to read the content.

HttpClient httpClient = new HttpClient();
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

var postData = new List<KeyValuePair<string, string>>();
postData.Add(new KeyValuePair<string, string>(str_KEY1, str_VALUE1));
postData.Add(new KeyValuePair<string, string>(str_KEY2, str_VALUE2));
postData.Add(new KeyValuePair<string, string>(str_KEY3, str_VALUE3));
postData.Add(new KeyValuePair<string, string>(str_KEY4, str_VALUE4));
postData.Add(new KeyValuePair<string, string>(str_KEY5, str_VALUE5));

HttpContent content = new FormUrlEncodedContent(postData);

httpClient.PostAsync(strURI, content).ContinueWith(requestTask =>
// Get HTTP response from completed task.
HttpResponseMessage response = requestTask.Result;

// Check that response was successful or throw exception

// Read response asynchronously as string and write out
var responseValue = response.Content.ReadAsStringAsync();

string n = responseValue.Result;

var i = 0;

Now then, string n's content is as follows, but how do I get at the JSON???
Thanks all.

StatusCode: 200, ReasonPhrase: 'OK', Version: 1.1, Content: System.Net.Http.StringContent, Headers:
Content-Type: application/json; charset=utf-8


Sounds like you figured out the problem, but it should be noted that since you're using Web API, there's no need to serialize the data and build the HttpResponseMessage yourself; let the framework do it for you:

public WpOAuth2TokenRetValSuccessVM token(string grant_type,
                                          string code,
                                          string client_id,
                                          string client_secret,
                                          string redirect_uri)
    return new WpOAuth2TokenRetValSuccessVM
        access_token = "value1",
        client_in = client_id,
        expires_in = "value2",
        scope = "value3"