如何根据角色更改ASP.Net MVC登录重定向？

[HttpPost]
[AllowAnonymous]
[ValidateAntiForgeryToken]
public async Task<ActionResult> Login(LoginViewModel model, string returnUrl)
{
    if (!ModelState.IsValid)
    {
        return View(model);
    }

    var user = await UserManager.FindAsync(model.Email, model.Password);
    if (user != null)
    {
        await SignInAsync(user, model.RememberMe);
        // 获取用户的角色信息
        var roles = await UserManager.GetRolesAsync(user.Id);
        // 根据角色设置重定向的目标URL
        string redirectUrl = "";
        if (roles.Contains("Admin"))
        {
            redirectUrl = "Admin/Index";
        }
        else if (roles.Contains("User"))
        {
            redirectUrl = "User/Index";
        }
        else
        {
            redirectUrl = "Home/Index";
        }
        // 使用RedirectToAction方法进行重定向
        return RedirectToAction(redirectUrl);
    }
    else
    {
        ModelState.AddModelError("", "Invalid login attempt.");
        return View(model);
    }
}