.net mvc 扩展IPrincipal接口

1.自定义实现IPrincipal接口的类
 interface ICustomPrincipal : IPrincipal
{
    string Identifier { get; set; }
    string IdentityType { get; set; }
}
public class CustomPrincipal : ICustomPrincipal
{
    public IIdentity Identity { get; private set; }
    public bool IsInRole(string role) { return false; }
    public CustomPrincipal()
    {
    }
    public CustomPrincipal(string identifer)
    {
        this.Identity = new GenericIdentity(identifer);
    }

    public  CustomPrincipal(IIdentity identity)
    {
        this.Identity = identity;
    }

    public string Identifier
    {
        get;
        set;
    }

    public string IdentityType
    {
        get;
        set;
    }
}
public class CustomPrincipalSerializeModel
{
    public string Identifier { get; set; }
    public string IdentityType { get; set; }
}
2.登录成功，存储相关登录信息
CustomPrincipalSerializeModel serializeModel = new CustomPrincipalSerializeModel();
serializeModel.Identifier = model.Account;
serializeModel.IdentityType = "email";

JavaScriptSerializer serializer = new JavaScriptSerializer();

string userData = serializer.Serialize(serializeModel);

FormsAuthenticationTicket authTicket = new FormsAuthenticationTicket(
         1,
         model.Account,
         DateTime.Now,
         DateTime.Now.AddMinutes(15),
         false,
         userData);

string encTicket = FormsAuthentication.Encrypt(authTicket);
HttpCookie faCookie = new HttpCookie(FormsAuthentication.FormsCookieName, encTicket);
Response.Cookies.Add(faCookie);
3.在Global文件中注册Application_PostAuthenticateRequest事件
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.Identifier = serializeModel.Identifier;
        newUser.IdentityType = serializeModel.IdentityType;

        HttpContext.Current.User = newUser;
    }
 
}
4.在BaseController中获取登录相关信息
protected virtual new CustomPrincipal User
{
    get { return HttpContext.User as CustomPrincipal; }
}
5.方法中使用
User.Identifier