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copied!<p>Here's how I do it.</p> <p>I decided to use IPrincipal instead of IIdentity because it means I don't have to implement both IIdentity and IPrincipal.</p> <ol> <li><p>Create the interface</p> <pre><code>interface ICustomPrincipal : IPrincipal { int Id { get; set; } string FirstName { get; set; } string LastName { get; set; } } </code></pre></li> <li><p>CustomPrincipal</p> <pre><code>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; } } </code></pre></li> <li><p>CustomPrincipalSerializeModel - for serializing custom information into userdata field in FormsAuthenticationTicket object.</p> <pre><code>public class CustomPrincipalSerializeModel { public int Id { get; set; } public string FirstName { get; set; } public string LastName { get; set; } } </code></pre></li> <li><p>LogIn method - setting up a cookie with custom information</p> <pre><code>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"); } </code></pre></li> <li><p>Global.asax.cs - Reading cookie and replacing HttpContext.User object, this is done by overriding PostAuthenticateRequest</p> <pre><code>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; } } </code></pre></li> <li><p>Access in Razor views</p> <pre><code>@((User as CustomPrincipal).Id) @((User as CustomPrincipal).FirstName) @((User as CustomPrincipal).LastName) </code></pre></li> </ol> <p>and in code:</p> <pre><code> (User as CustomPrincipal).Id (User as CustomPrincipal).FirstName (User as CustomPrincipal).LastName </code></pre> <p>I think the code is self-explanatory. If it isn't, let me know.</p> <p>Additionally to make the access even easier you can create a base controller and override the returned User object (HttpContext.User):</p> <pre><code>public class BaseController : Controller { protected virtual new CustomPrincipal User { get { return HttpContext.User as CustomPrincipal; } } } </code></pre> <p>and then, for each controller:</p> <pre><code>public class AccountController : BaseController { // ... } </code></pre> <p>which will allow you to access custom fields in code like this:</p> <pre><code>User.Id User.FirstName User.LastName </code></pre> <p>But this will not work inside views. For that you would need to create a custom WebViewPage implementation:</p> <pre><code>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; } } } </code></pre> <p>Make it a default page type in Views/web.config:</p> <pre><code><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> </code></pre> <p>and in views, you can access it like this:</p> <pre><code>@User.FirstName @User.LastName </code></pre>

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