c# - Two questions about MVC, and Identity -

i new identity , mvc, trying create mvc app 1 of first projects.

i have been able follow few tutorials , have added additional properties applicationuser : identityuser class

public class applicationuser     : identityuser<string, applicationuserlogin,     applicationuserrole, applicationuserclaim> {     [required]     [display(name = "username")]     [stringlength(50)]     public string handle { get; set; }      [stringlength(100, errormessage = "your {0} can @ {1} characters long.")]     [display(name = "first name")]     public string firstname { get; set; }      [stringlength(100, errormessage = "your {0} can @ {1} characters long.")]     [display(name = "last name")]     public string lastname { get; set; }      [required]     [display(name = "user creation date")]     public datetime usercreationdate { get; set; }      public applicationuser()     {         this.id = guid.newguid().tostring();          // add custom user properties/code here     } 

my questions are:

1. i see email set require unique email in app_start.identityconfig.cs, there way set require unique custom property handle?

       var manager = new applicationusermanager(new userstore<applicationuser, applicationrole, string, applicationuserlogin, applicationuserrole, applicationuserclaim>(context.get<applicationdbcontext>()));     // configure validation logic usernames     manager.uservalidator = new uservalidator<applicationuser>(manager)     {         allowonlyalphanumericusernames = false,         requireuniqueemail = true     }; 

2. in partial view of views.shared._loginpartial.cshtml shows username/email of person logging application using user.identity.getusername() there way reference 1 of custom properties there instead such firstname, or handle?

   @using microsoft.aspnet.identity  @if (request.isauthenticated) {     using (html.beginform("logoff", "account", formmethod.post, new { id = "logoutform", @class = "navbar-right" }))     {     @html.antiforgerytoken()      <ul class="nav navbar-nav navbar-right">         <li>             @html.actionlink("hello " + user.identity.getusername() + "!", "index", "manage", routevalues: null, htmlattributes: new { title = "manage" })         </li>         <li><a href="javascript:document.getelementbyid('logoutform').submit()">log off</a></li>     </ul>     } } else {     <ul class="nav navbar-nav navbar-right">         <li>@html.actionlink("register", "register", "account", routevalues: null, htmlattributes: new { id = "registerlink" })</li>         <li>@html.actionlink("log in", "login", "account", routevalues: null, htmlattributes: new { id = "loginlink" })</li>     </ul> } 

implementing custom uservalidator has been covered here: how can customize asp.net identity 2 username taken validation message?

rather hitting database every page request display handle, add claim during signin.

define own claim:

public static class customclaimtypes {     public const string handle = "http://schemas.xmlsoap.org/ws/2014/03/mystuff/claims/handle"; } 

during signin, set claim:

private async task signinasync(applicationuser user, bool ispersistent, string password = null) {     authenticationmanager.signout(defaultauthenticationtypes.externalcookie);      var identity = await usermanager.createidentityasync(user, defaultauthenticationtypes.applicationcookie);      //get handle , add claim identity.     var handle = getthehandle();     identity.addclaim(new claim(customclaimtypes.handle, handle);      authenticationmanager.signin(new authenticationproperties() { ispersistent = ispersistent }, identity); } 

then, via extension method can read out same way getusername():

public static class identityextensions {     public static string gethandle(this iidentity identity)     {         if (identity == null)             return null;          return (identity claimsidentity).firstornull(customclaimtypes.handle);     }      internal static string firstornull(this claimsidentity identity, string claimtype)     {         var val = identity.findfirst(claimtype);          return val == null ? null : val.value;     } } 

finally, in view:

@user.identity.gethandle()