C＃：UserManager.FindAsync总是找到一个匹配项

Question

UserManager.FindAsync always finds a match even when I input a wrong username and password it always returns with some sort of userID.

[HttpPost]
public ActionResult Mobilelogin(LoginViewModel model)
{
    var user = UserManager.FindAsync(model.Email, model.Password);
    if (user != null)
    {
        return new HttpStatusCodeResult(201); // user found
    }
    else
    {
        return new HttpStatusCodeResult(401); // user not found
    }
}

Answer 1

FindAsync returns a Task<TUser> . If you work with it synchronously (as you are doing right now), you will always get the Task itself which is not null.

You need to wait on the task asynchronously to get the result (the TUser ) like this:

[HttpPost]
public async Task<ActionResult> Mobilelogin(LoginViewModel model)
{
    var user = await UserManager.FindAsync(model.Email, model.Password);
    if (user != null)
    {
        return new HttpStatusCodeResult(201); // user found
    }
    else
    {
        return new HttpStatusCodeResult(401); // user not found
    }
}

Take a look at this reference for more information about asynchronous programming with ASP.NET MVC.