要为Asp.net MVC应用程序添加身份验证账户控制器，可以按照以下步骤进行操作：

1. 打开Visual Studio并打开你的Asp.net MVC项目。

2. 在解决方案资源管理器中，右键单击Controllers文件夹，然后选择“添加”>“控制器”。

3. 在“添加新项”对话框中，选择“控制器类（空）”，然后点击“添加”。

4. 在控制器类文件中，添加以下代码示例：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Microsoft.AspNet.Identity;
using Microsoft.AspNet.Identity.Owin;
using Microsoft.Owin.Security;

namespace YourAppName.Controllers
{
    [Authorize]
    public class AccountController : Controller
    {
        private ApplicationUserManager _userManager;
        private ApplicationSignInManager _signInManager;
        private IAuthenticationManager _authenticationManager;

        public AccountController()
        {
        }

        public AccountController(ApplicationUserManager userManager, ApplicationSignInManager signInManager, IAuthenticationManager authenticationManager)
        {
            UserManager = userManager;
            SignInManager = signInManager;
            AuthenticationManager = authenticationManager;
        }

        public ApplicationUserManager UserManager
        {
            get
            {
                return _userManager ?? HttpContext.GetOwinContext().GetUserManager();
            }
            private set
            {
                _userManager = value;
            }
        }

        public ApplicationSignInManager SignInManager
        {
            get
            {
                return _signInManager ?? HttpContext.GetOwinContext().Get();
            }
            private set { _signInManager = value; }
        }

        public IAuthenticationManager AuthenticationManager
        {
            get
            {
                return _authenticationManager ?? HttpContext.GetOwinContext().Authentication;
            }
            private set { _authenticationManager = value; }
        }

        // 添加其他身份验证相关的操作方法，例如注册、登录、注销等

        // 注册
        [AllowAnonymous]
        public ActionResult Register()
        {
            return View();
        }

        [HttpPost]
        [AllowAnonymous]
        [ValidateAntiForgeryToken]
        public async Task Register(RegisterViewModel model)
        {
            if (ModelState.IsValid)
            {
                var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
                var result = await UserManager.CreateAsync(user, model.Password);
                if (result.Succeeded)
                {
                    await SignInManager.SignInAsync(user, isPersistent: false, rememberBrowser: false);
                    return RedirectToAction("Index", "Home");
                }
                AddErrors(result);
            }
            return View(model);
        }

        // 登录
        [AllowAnonymous]
        public ActionResult Login()
        {
            return View();
        }

        [HttpPost]
        [AllowAnonymous]
        [ValidateAntiForgeryToken]
        public async Task Login(LoginViewModel model, string returnUrl)
        {
            if (ModelState.IsValid)
            {
                var result = await SignInManager.PasswordSignInAsync(model.Email, model.Password, model.RememberMe, shouldLockout: false);
                switch (result)
                {
                    case SignInStatus.Success:
                        return RedirectToLocal(returnUrl);
                    case SignInStatus.LockedOut:
                        return View("Lockout");
                    case SignInStatus.RequiresVerification:
                        return RedirectToAction("SendCode", new { ReturnUrl = returnUrl, RememberMe = model.RememberMe });
                    case SignInStatus.Failure:
                    default:
                        ModelState.AddModelError("", "Invalid login attempt.");
                        return View(model);
                }
            }
            return View(model);
        }

        // 注销
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult LogOff()
        {
            AuthenticationManager.SignOut(DefaultAuthenticationTypes.ApplicationCookie);
            return RedirectToAction("Index", "Home");
        }

        // 帮助方法
        private void AddErrors(IdentityResult result)
        {
            foreach (var error in result.Errors)
            {
                ModelState.AddModelError("", error);
            }
        }

        private ActionResult RedirectToLocal(string returnUrl)
        {
            if (Url.IsLocalUrl(returnUrl))
            {
                return Redirect(returnUrl);
            }
            return RedirectToAction("Index", "Home");
        }
    }
}

上述代码示例是一个基本的身份验证账户控制器，其中包含了注册、登录和注销等操作方法。你可以根据自己的需求来修改和扩展这些方法。

5. 保存并构建你的项目。

现在，你已经成功添加了一个身份验证账户控制器到你的Asp.net MVC应用程序中。你可以使用这个控制器来管理用户的注册、登录和