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QuestionASP Net WebAPI Newby Question Pin
Kevin Marois28-Oct-13 6:14
memberKevin Marois28-Oct-13 6:14 
I am VERY new to using WepAPI, and I have a problem. This might be a bit long, but I'm not sure what to post...

I'm using RestSharp....

I created a controller called AppSecurityController. It wraps calls to my security API. In it is a Login method:

The problem is that in the Login method, the Credential parameter is always null.

public LoginResponse Login(FMG.Entities.CredentialEntity Credentials)
    Marois.Common.AppSecurity.Entities.CredentialEntity credentials = new Marois.Common.AppSecurity.Entities.CredentialEntity
        UserName = Credentials.UserName,
        Password = Credentials.Password

    LoginResponse response = appSecurityBL.Login(credentials);
    return response;

My solution has a project called Entities. In it is the Credential class:

public class CredentialEntity : _BaseEntity
    public string Password { get; set; }

    public string UserName { get; set; }

In my client project I have local models, which also has a CredentialModel:
namespace FMG.UI.WPF.Shared.Models
  public class CredentialModel : _BaseModel
      public string Password { get; set; }

      public string UserName { get; set; }

I call to the WebAPI through a proxy class:

public LoginResponseModel Login(CredentialModel credentials)
    WebAPIExecutor webAPIExecutor = new WebAPIExecutor("/AppSecurity/Login/", Method.GET);


    LoginResponseModel results = webAPIExecutor.Execute<LoginResponseModel>();

    return results;

WebAPIExecutor is a class for handling the RestSharp stuff:

public class WebAPIExecutor
    #region Private Fields
    private RestClient client;
    private RestRequest request;

    #region CTOR
    public WebAPIExecutor(string url, Method method = Method.POST)
        if (string.IsNullOrEmpty(url))
            throw new ArgumentNullException("Url");

        // Set up the URL to the server

        client = new RestClient(ServerAddress);

        client.AddHandler("text/plain", new JsonDeserializer());

        request = new RestRequest(url, method)
            RequestFormat = RestSharp.DataFormat.Json

    #region Public Methods
    public void AddParameter(object value, string name = "")
        if (value == null)
            throw new ArgumentNullException("value");

        Type type = value.GetType();
        bool isPrimitive = type.IsPrimitive;

        if(!string.IsNullOrEmpty(name) || (isPrimitive || type == typeof(string) || type == typeof(decimal)))
            if (string.IsNullOrEmpty(name) && request.Method == Method.GET)
                throw new ArgumentNullException("Parameter 'Name' cannot be empty for Get requests");

            request.AddParameter(name, value);

    public T Execute<T>() where T : new()
        IRestResponse<T> result = client.Execute<T>(request);

        int resultValue = (int)result.StatusCode;

        if (resultValue >= 299)
            string message = string.Format("An error occured calling the WebAPI. {0} The status code is '{1}'. {2} The error message is {3}", 
                                            Environment.NewLine, result.StatusCode, Environment.NewLine, result.Content );
            MessageBox.Show(message, "WebAPI Error", MessageBoxButton.OK, MessageBoxImage.Exclamation);

            throw new Exception(message);

        return result.Data;

    public void Execute()
        IRestResponse result = null;

            result = client.Execute(request);

            //TODO: Handle this differently.
            int resultCode = (int)result.StatusCode;

            //if (result.StatusCode != HttpStatusCode.OK)
            if (resultCode > 299)
                string message = "the error message";  //<== omitted for brevitry
                throw new Exception(message);
        catch (Exception e)
            throw e;

The parameter is being added with AddParameter and appears to be correct. The controller method is marked as HttpGet.

When I call from the proxy, through the WebAPIExecutor, I reach the controller and the parameter is null.

I'm am really clueless as to why the parameter is null in the controller. Can someone see what I'm doing wrong?

Many thanks
If it's not broken, fix it until it is

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