实现自定义 UserValidator 已经在这里涵盖：How可以自定义Asp.net身份2名已被使用验证消息？

而不是命中为每个页面请求显示处理数据库，登入过程中添加的索赔。

定义你自己的要求：

 公共静态类CustomClaimTypes
{
    公共常量字符串句柄=htt​​p://schemas.xmlsoap.org/ws/2014/03/mystuff/claims/handle;
}
 

在登入，设置声明：

 专用异步任务SignInAsync（ApplicationUser用户，布尔isPersistent，字符串密码= NULL）
{
    AuthenticationManager.SignOut（DefaultAuthenticationTypes.ExternalCookie）;    VAR身份=等待UserManager.CreateIdentityAsync（用户，DefaultAuthenticationTypes.ApplicationCookie）;    //获取手柄，并添加自称的身份。
    VAR手柄= GetTheHandle（）;
    identity.AddClaim（新索赔（CustomClaimTypes.Handle，手柄）;    AuthenticationManager.SignIn（新AuthenticationProperties（）{IsPersistent = isPersistent}，身份）;
}
 

然后，通过一个扩展方法，你可以读取它的出路一样 GetUserName（）：

 公共静态类IdentityExtensions
{
    公共静态字符串GetHandle（此的IIdentity身份）
    {
        如果（身份== NULL）
            返回null;        返回（身份ClaimsIdentity）.FirstOrNull（CustomClaimTypes.Handle）;
    }    内部静态字符串FirstOrNull（这ClaimsIdentity身份，串claimType）
    {
        VAR VAL = identity.FindFirst（claimType）;        返回VAL == NULL？空：val.Value;
    }
}
 

最后，在你看来：

  @ User.Identity.GetHandle（）
 

I am very new to identity and MVC, I am trying to create an MVC app as one of my first projects.

I have been able to follow a few tutorials and have successfully added additional properties to my 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 be at most {1} characters long.")]
    [Display(Name = "First Name")]
    public string FirstName { get; set; }

    [StringLength(100, ErrorMessage = "Your {0} can be at most {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 any custom User properties/code here
    }

My questions are:

1. I see where Email is set to require a unique Email in App_Start.IdentityConfig.cs, Is there a way to set it up to require a unique custom property like Handle?

       var manager = new ApplicationUserManager(new UserStore<ApplicationUser, ApplicationRole, string, ApplicationUserLogin, ApplicationUserRole, ApplicationUserClaim>(context.Get<ApplicationDbContext>()));
       // Configure validation logic for usernames
       manager.UserValidator = new UserValidator<ApplicationUser>(manager)
       {
           AllowOnlyAlphanumericUserNames = false,
           RequireUniqueEmail = true
       };
   

2. In the Partial View of Views.Shared._LoginPartial.cshtml it shows the UserName/Email of the person logging into the application using User.Identity.GetUserName() is there a way to reference one of my custom properties there instead such as 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 a custom UserValidator has already been covered here: How can customize Asp.net Identity 2 username already taken validation message?

Rather than hitting the database for every page request to display the handle, add a claim during signin.

Define your own claim:

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

During signin, set the 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 the handle and add the claim to the identity.
    var handle = GetTheHandle();
    identity.AddClaim(new Claim(CustomClaimTypes.Handle, handle);

    AuthenticationManager.SignIn(new AuthenticationProperties() { IsPersistent = isPersistent }, identity);
}

Then, via an extension method you can read it out the same way as GetUserName():

public static class IdentityExtensions
{
    public static string GetHandle(this IIdentity identity)
    {
        if (identity == null)
            return null;

        return (identity as 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 your view:

@User.Identity.GetHandle()