ASP.NET 5 / MVC 6 Ajax post Model to Controller

You need to explicit use FromBody on MVC6 if you are using json

public JsonResult Login([FromBody]LoginViewModel model)

EDIT

I think you are mixing different errors. I will try to describe how you should make the request:

content-type must be: application/json

your request body must be in JSON format (as JasonLind suggested):

{    UserName: 'Test',    Password: 'Test',    RememberMe: true};

this is what you should see when inspecting the request (via chrome debugger tools F12) or using a request inspector like fiddler.

If you see something in the form of UserName=Test&Password=Test&RememberMe=true then you are doing it wrong, that's form format.

you don't need the model variable. if you see your request with a "wrapper" then you should remove it.

You can implement BindModel yourself! get the json string and deserialize to your entity.

public class JsonBinder<T> : System.Web.Mvc.IModelBinder{    public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)    {        using (var reader = new System.IO.StreamReader(controllerContext.HttpContext.Request.InputStream))        {            //set stream position 0, maybe previous action already read the stream.            controllerContext.HttpContext.Request.InputStream.Position = 0;            string json = reader.ReadToEnd();            if (string.IsNullOrEmpty(json) == false)            {                JavaScriptSerializer serializer = new JavaScriptSerializer();                object jsonData = serializer.DeserializeObject(json);                return serializer.Deserialize<T>(json);            }            else            {                return null;            }        }    }}

and set the JsonBinder to the post method like

[HttpPost]public JsonResult Login([ModelBinder(typeof(JsonBinder<LoginViewModel>))] LoginViewModel model){    if (ModelState.IsValid)    {        //var result = await SignInManager.PasswordSignInAsync(model.UserName, model.Password, model.RememberMe, shouldLockout: false);        //if (result.Succeeded)        //{        //     //return RedirectToLocal(returnUrl);        //}        ModelState.AddModelError("", "Identifiant ou mot de passe invalide");        return Json("error-model-wrong");    }    // If we got this far, something failed, redisplay form    return Json("error-mode-not-valid");}

the other solution

I found that you could set DataContract to the class of Model, and set DataMember to the Properties of the class.

edit the class like this

[DataContract]public class LoginViewModel{    [DataMember]    public string UserName { get; set; }    [DataMember]    public string Password { get; set; }    [DataMember]    public bool RememberMe { get; set; }}

and you should add library reference "System.Runtime.Serialization"

Hope it can works for u.

Shouldn't it be:

 var data = {            UserName: 'Test',            Password: 'Test',            RememberMe: true    };