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copied!<p>A Principal is not something you can just set once when writing the auth cookie and forget later. During subsequent requests, the auth cookie is read and the <code>IPrincipal</code> / <code>IIdentity</code> is reconstructed before executing an action method. When that happens, trying to cast the <code>HttpContext.User</code> to your custom <code>Member</code> type will throw an exception.</p> <p>One option would be to intercept in an <code>ActionFilter</code>, and just wrap the standard implementation.</p> <pre><code>public class UsesCustomPrincipalAttribute : ActionFilterAttribute { public override void OnActionExecuting(ActionExecutingContext filterContext) { var systemPrincipal = filterContext.HttpContext.User; var customPrincipal = new Member(systemPrincipal) { Id = "not sure where this comes from", }; filterContext.HttpContext.User = customPrincipal; } } public class Member : IPrincipal { private readonly IPrincipal _systemPrincipal; public Member(IPrincipal principal) { if (principal == null) throw new ArgumentNullException("principal"); _systemPrincipal = principal; } public string Id { get; set; } public IIdentity Identity { get { return _systemPrincipal.Identity; } } public bool IsInRole(string role) { return _systemPrincipal.IsInRole(role); } } </code></pre> <p>This way, you're not losing anything that comes out of the box with the default <code>IPrincipal</code> and <code>IIdentity</code> implementations. You can still invoke <code>IsAuthenticated</code> on the <code>IIdentity</code>, or even <code>IsInRole(string)</code> on the <code>IPrincipal</code>. The only thing you're gaining is the extra <code>Id</code> property on your custom <code>IPrincipal</code> implementation (though I'm not sure where this comes from or why you need it).</p>

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