ASP.NET MVC:从变量设置Authorize属性Role时出现问题,需要const

[Authorize(Roles = "Admin, Manager")]
public class MyController : Controller
{
    // ...
}

[Authorize(Roles = "Admin")]
public ActionResult MyAction()
{
    // ...
}

var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
var result = await UserManager.CreateAsync(user, model.Password);
if (result.Succeeded)
{
    var roleStore = new RoleStore<IdentityRole>(new ApplicationDbContext());
    var roleManager = new RoleManager<IdentityRole>(roleStore);
    await roleManager.CreateAsync(new IdentityRole("Admin"));
    await UserManager.AddToRoleAsync(user.Id, "Admin");
}