JSON Object and Simple Type to Model in WebAPI using FromBody

Question

I am creating a Web Api method that should accept a JSON Object and a Simple Type. But all parameters are always null.

My json looks like

{
"oldCredentials" : {
    "UserName" : "user",
    "PasswordHash" : "myCHqkiIAnybMPLzz3pg+GLQ8kM=",
    "Nonce" : "/SeVX599/KjPX/J+JvX3/xE/44g=",
    "Language" : null,
    "SaveCredentials" : false
},
"newPassword" : "asdf"}

And my Code looks like:

[HttpPut("UpdatePassword")]
[Route("WebServices/UsersService.svc/rest/users/user")]
public void UpdatePassword([FromBody]LoginData oldCredentials, [FromBody]string newPassword)
{
  NonceService.ValidateNonce(oldCredentials.Nonce);

  var users = UserStore.Load();
  var theUser = GetUser(oldCredentials.UserName, users);

  if (!UserStore.AuthenticateUser(oldCredentials, theUser))
  {
    FailIncorrectPassword();
  }

  var iv = Encoder.GetRandomNumber(16);
  theUser.EncryptedPassword = Encoder.Encrypt(newPassword, iv);
  theUser.InitializationVektor = iv;

  UserStore.Save(users);
}

Please check my bellow answer and let me know whether its working or not — Basanta Matia
– Basanta Matia, Commented Apr 12, 2017 at 10:03
I am creating an ASP.NET Core Web Application with the Web API Template. Because it is just a rest service. — Kingpin
– Kingpin, Commented Apr 12, 2017 at 10:21

Nkosi · Accepted Answer · 2017-04-12 10:09:36Z

5

The current JSON you are sending maps to the following classes

public class LoginData {
    public string UserName { get; set; }
    public string PasswordHash { get; set; }
    public string Nonce { get; set; }
    public string Language { get; set; }
    public bool SaveCredentials { get; set; }
}

public class UpdateModel {
    public LoginData oldCredentials { get; set; }
    public string newPassword { get; set; }
}

[FromBody] can only be used once in action parameters

[HttpPut("WebServices/UsersService.svc/rest/users/user")]
public void UpdatePassword([FromBody]UpdateModel model) {
    LoginData oldCredentials = model.oldCredentials;
    string newPassword = model.newPassword;
    NonceService.ValidateNonce(oldCredentials.Nonce);

    var users = UserStore.Load();
    var theUser = GetUser(oldCredentials.UserName, users);

    if (!UserStore.AuthenticateUser(oldCredentials, theUser)) {
        FailIncorrectPassword();
    }

    var iv = Encoder.GetRandomNumber(16);
    theUser.EncryptedPassword = Encoder.Encrypt(newPassword, iv);
    theUser.InitializationVektor = iv;

    UserStore.Save(users);
}

answered Apr 12, 2017 at 10:09

Nkosi

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2 Comments

Kingpin Over a year ago

Thanks, creating a help-class combing both was the solution. I was used to wcf where it is possible to have more than one paramter.

Nkosi Over a year ago

It is possible. but the way you are sending the data and trying to access in the parameters don't match up. that is why they were always null.

Basanta Matia · Accepted Answer · 2017-04-12 10:11:51Z

3

More than one [FromBody] does not work in Api. Check this Microsoft Official blog

So now you can do like this, create a complex object which should contain both your oldCredentials and newPassword. For example LoginData class in my example bellow. And myLoginRequest is another object class which is to deserialized your LoginData.

[HttpPut("UpdatePassword")]
[Route("WebServices/UsersService.svc/rest/users/user")]
public void UpdatePassword([FromBody]LoginData MyCredentials)
{
 loginRequest request = JsonConvert.DeserializeObject<myLoginRequest>
                            (json.ToString());

 // then you can do the rest

edited Apr 12, 2017 at 10:11

answered Apr 12, 2017 at 10:02

Basanta Matia

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Comments

Mukesh Modhvadiya · Accepted Answer · 2017-04-12 10:03:54Z

2

As per the Parameter Binding in ASP.NET Web API, "At most one parameter is allowed to read from the message body". Means only one parameter can contain [FromBody]. So in this case it will not work. Create one complex object and add required properties to it. You can add newPassword to your complex object to make it work.

answered Apr 12, 2017 at 10:03

Mukesh Modhvadiya

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Comments

user3392221 · Accepted Answer · 2018-03-20 13:01:59Z

public class DocumentController : ApiController
{
    [HttpPost]
    public IHttpActionResult PostDocument([FromBody] Container data)
    {
        try
        {
            if (string.IsNullOrWhiteSpace(data.Document)) return ResponseMessage(Request.CreateResponse(HttpStatusCode.NoContent, "No document attached"));

            return ResponseMessage(IndexDocument(data, Request));
        }
        catch (Exception ex)
        {
            return ResponseMessage(Request.CreateResponse(HttpStatusCode.NotAcceptable, ex.Message));
        }
    }

}



public class InsuranceContainer
{
    [JsonProperty("token")]
    public string Token { get; set; }
    [JsonProperty("document")]
    public string Document { get; set; }

    [JsonProperty("text")]
    public string Text { get; set; }
}




var fileAsBytes = File.ReadAllBytes(@"C:\temp\tmp62.pdf");
String asBase64String = Convert.ToBase64String(fileAsBytes);


var newModel = new InsuranceContainer
    {
       Document = asBase64String,
       Text = "Test document",
    };

string json = JsonConvert.SerializeObject(newModel);

using (var stringContent = new StringContent(json, System.Text.Encoding.UTF8, "application/json"))
    using (var client = new HttpClient())
    {
        var response = await client.PostAsync("https://www.mysite.dk/WebService/api/Document/PostDocument", stringContent);
        Console.WriteLine(response.StatusCode);
        var message = response.Content.ReadAsStringAsync();
        Console.WriteLine(message.Result);


    }

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