这是我的做法。

我决定使用 IPrincipal 而不是 IIdentity，因为这意味着我不必同时实现 IIdentity 和 IPrincipal。

1. 创建接口

   interface ICustomPrincipal : IPrincipal
   

   {
   int Id { get; set; }
   string FirstName { get; set; }
   string LastName { get; set; }
   }

2. 自定义主体

   public class CustomPrincipal : ICustomPrincipal
   

   {
   public IIdentity Identity { get; private set; }
   public bool IsInRole(string role) { return false; }

   public CustomPrincipal(string email)
   {
       this.Identity = new GenericIdentity(email);
   }
   
   public int Id { get; set; }
   public string FirstName { get; set; }
   public string LastName { get; set; }
   

   }

3. CustomPrincipalSerializeModel - 用于将自定义信息序列化到 FormsAuthenticationTicket 对象中的 userdata 字段中。

   public class CustomPrincipalSerializeModel
   

   {
   public int Id { get; set; }
   public string FirstName { get; set; }
   public string LastName { get; set; }
   }

4. 登录方法 - 使用自定义信息设置 cookie

   if (Membership.ValidateUser(viewModel.Email, viewModel.Password))
   

   {
   var user = userRepository.Users.Where(u => u.Email == viewModel.Email).First();

   CustomPrincipalSerializeModel serializeModel = new CustomPrincipalSerializeModel();
   serializeModel.Id = user.Id;
   serializeModel.FirstName = user.FirstName;
   serializeModel.LastName = user.LastName;
   
   JavaScriptSerializer serializer = new JavaScriptSerializer();
   
   string userData = serializer.Serialize(serializeModel);
   
   FormsAuthenticationTicket authTicket = new FormsAuthenticationTicket(
            1,
            viewModel.Email,
            DateTime.Now,
            DateTime.Now.AddMinutes(15),
            false,
            userData);
   
   string encTicket = FormsAuthentication.Encrypt(authTicket);
   HttpCookie faCookie = new HttpCookie(FormsAuthentication.FormsCookieName, encTicket);
   Response.Cookies.Add(faCookie);
   
   return RedirectToAction("Index", "Home");
   

   }

5. Global.asax.cs - 读取 cookie 并替换 HttpContext.User 对象，这是通过覆盖 PostAuthenticateRequest 来完成的

   protected void Application_PostAuthenticateRequest(Object sender, EventArgs e)
   

   {
   HttpCookie authCookie = Request.Cookies[FormsAuthentication.FormsCookieName];

   if (authCookie != null)
   {
       FormsAuthenticationTicket authTicket = FormsAuthentication.Decrypt(authCookie.Value);
   
       JavaScriptSerializer serializer = new JavaScriptSerializer();
   
       CustomPrincipalSerializeModel serializeModel = serializer.Deserialize<CustomPrincipalSerializeModel>(authTicket.UserData);
   
       CustomPrincipal newUser = new CustomPrincipal(authTicket.Name);
       newUser.Id = serializeModel.Id;
       newUser.FirstName = serializeModel.FirstName;
       newUser.LastName = serializeModel.LastName;
   
       HttpContext.Current.User = newUser;
   }
   

   }

6. 在 Razor 视图中访问

   @((User as CustomPrincipal).Id)
   

   @((User as CustomPrincipal).FirstName)
   @((User as CustomPrincipal).LastName)

在代码中：

    (User as CustomPrincipal).Id
    (User as CustomPrincipal).FirstName
    (User as CustomPrincipal).LastName

我认为代码是不言自明的。如果不是，请告诉我。

此外，为了使访问更容易，您可以创建一个基本控制器并覆盖返回的用户对象 (HttpContext.User)：

public class BaseController : Controller
{
    protected virtual new CustomPrincipal User
    {
        get { return HttpContext.User as CustomPrincipal; }
    }
}

然后，对于每个控制器：

public class AccountController : BaseController
{
    // ...
}

这将允许您访问代码中的自定义字段，如下所示：

User.Id
User.FirstName
User.LastName

但这在视图内部不起作用。为此，您需要创建一个自定义 WebViewPage 实现：

public abstract class BaseViewPage : WebViewPage
{
    public virtual new CustomPrincipal User
    {
        get { return base.User as CustomPrincipal; }
    }
}

public abstract class BaseViewPage<TModel> : WebViewPage<TModel>
{
    public virtual new CustomPrincipal User
    {
        get { return base.User as CustomPrincipal; }
    }
}

使其成为 Views/web.config 中的默认页面类型：

<pages pageBaseType="Your.Namespace.BaseViewPage">
  <namespaces>
    <add namespace="System.Web.Mvc" />
    <add namespace="System.Web.Mvc.Ajax" />
    <add namespace="System.Web.Mvc.Html" />
    <add namespace="System.Web.Routing" />
  </namespaces>
</pages>

在视图中，您可以像这样访问它：

@User.FirstName
@User.LastName