如何在MVC / Membershipprovider中使用异步等待功能

Question

I would like to authenticate user using Parse Library .

Here are the methods which I would like to make it asyc as api call supports only async call. I am new to MVC and aysc/await functionality. Problem now is that it goes in await method and never returns result and view cant be loaded.

I spend quite some time understanding and trying to use different options but no success yet.

Do I need to use Partialviews or something can be done in ValidateUser method. Any sample code is really appreciated. Thanks.

AccountController.cs

  public ActionResult Login(LoginModel model, string returnUrl)
    {

             if (ModelState.IsValid && WebSecurity.Login(model.UserName, model.Password, persistCookie: model.RememberMe))
                {
                    var loggedIn = true;
                }
        return  View(model);
    }

ParseMembershipProvider : ExtendedMembershipProvider

public override bool ValidateUser(string username, string password)
    {

        var pUserRepo = new PUserRepository();
        bool flag = false;
        var requiredUser = pUserRepo.GetUserObjByUserName(username, password );


        if (requiredUser.Result != null)
            flag = true;

        return flag;

    }

PUserRepository.cs

 public async  Task<ParseUser> GetUserObjByUserName(string userName, string passWord)
{
    return await ParseUser.LogInAsync("test1", "test123");
}

Answer 1

You're seeing a deadlock situation due to Result that I explain on my blog .

Unfortunately, membership providers are not (yet) async -aware. So try using ConfigureAwait(false) everywhere in your async methods:

public async  Task<ParseUser> GetUserObjByUserName(string userName, string passWord)
{
  return await ParseUser.LogInAsync("test1", "test123").ConfigureAwait(false);
}

(same for any other async methods you have).

Answer 2

Solution is

return Task.Run(() => ParseUser.LogInAsync(userName, passWord)).Result;

So basically I have sync wrapper around async method call. I understood from article that it depends also how that function in Parse library is using await or configureawait(false).