How to send POST request in Xamarin?

Question

I've built my backend in rails. My email address is "sample@zmail.com" and it's already registered. The password is "28902890" here

After giving the following command in terminal

curl -v -H 'Content-Type: application/json' -H 'Accept: application/json' -X POST https://auth-agdit.herokuapp.com/api/v1/sessions -d "{\"user\":{\"email\":\"sample@zmail\",\"password\":\"28902890\"}}"

I get this response from my backend,

{"success":true,"info":"Logged in :) ","data":{"authentication_token":"iexGFwJ6HwERQZ3wJ4NG"}}

Now I need to get this data from my Android app. I can get json by using WebClient().downloadString() method for simple json where authentication is not needed and the request method is GET.

Now I need to get the output Json for POST method. How can I accomplish that?

score 3 · Answer 1 · edited May 23 '17 at 12:16

There are several methods of doing this. You could use the Xamarin component called RestSharp. This will provide you with easy methods of interfacing with your backend.

var request = new RestRequest("resource/{id}", Method.POST);
request.AddParameter("name", "value"); // adds to POST or URL querystring based on Method
request.AddUrlSegment("id", 123); // replaces matching token in request.Resource

// add parameters for all properties on an object
request.AddObject(object);

// execute the request
RestResponse response = client.Execute(request);

If you do want to simply use the WebClient class provided by the BCL you can use the WebClient.UploadString(string, string) method like so:

using (WebClient client = new WebClient())
{
  string json = "{\"user\":{\"email\":\"sample@zmail\",\"password\":\"28902890\"}}";
  client.UploadString("https://example.com/api/v1/sessions, json);
}

If you need more control over the request (such as setting accept headers, etc.) then you can use HttpRequest, see this question for an example of that.

This works but only after I added 'client.Headers[HttpRequestHeader.ContentType] = "application/json";' before UploadString() — quilkin, May 02 '16 at 22:17

score 2 · Accepted Answer · edited Nov 06 '18 at 12:23

This is how I did it:

  WebClient wc = new WebClient();
        string baseSiteString = wc.DownloadString("https://auth-agdit.herokuapp.com");
        string csrfToken = Regex.Match(baseSiteString, "<meta name=\"csrf-token\" content=\"(.*?)\" />").Groups[1].Value;
        string cookie = wc.ResponseHeaders[HttpResponseHeader.SetCookie];
        Console.WriteLine("CSRF Token: {0}", csrfToken);
        Console.WriteLine("Cookie: {0}", cookie);

        wc.Headers.Add(HttpRequestHeader.Cookie, cookie);
        wc.Headers.Add(HttpRequestHeader.ContentType, "application/json; charset=utf-8");
        wc.Headers.Add(HttpRequestHeader.Accept, "application/json, text/javascript, */*; q=0.01");
        wc.Headers.Add("X-CSRF-Token", csrfToken);
        wc.Headers.Add("X-Requested-With", "XMLHttpRequest");


        string dataString = @"{""user"":{""email"":""email_here"",""password"":""password_here""}}";
     //   string dataString = @"{""user"":{""email"":"""+uEmail+@""",""password"":"""+uPassword+@"""}}";
        byte[] dataBytes = Encoding.UTF8.GetBytes(dataString);
        byte[] responseBytes = wc.UploadData(new Uri("https://auth-agdit.herokuapp.com/api/v1/sessions.json"), "POST", dataBytes);
        string responseString = Encoding.UTF8.GetString(responseBytes);
        Console.WriteLine(responseString);

score -1 · Answer 3 · edited Jun 21 '16 at 14:15

-1

Try with this code:

Uri address = new Uri("http://example.com/insert.php");
NameValueCollection nameValueCollection = new NameValueCollection();
nameValueCollection["Name"] = "string-input";

var webClient = new WebClient();
webClient.UploadValuesAsync(address, "POST", nameValueCollection);

edited Jun 21 '16 at 14:15

Gustavo Morales

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answered Jun 21 '16 at 13:48

Md Deloyar Hossain

1
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How to send POST request in Xamarin?

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