How to get user's first name or last name from @context.User?

Question

I created a Server side Blazor application using Windows authentication. And it created the following file.

LoginDisplay.razor

<AuthorizeView>
    Hello, @context.User.Identity.Name!
</AuthorizeView>

However, it shows "DOMAIN\username". Is it a way to show the user first name?

I tried to print all the claim types.

@foreach(var c in context.User.Claims)
{
    <p>@c.Value @c.Type</p>
}

However, there is only one type with name in it. (with value of DOMAIN\username)

http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name

Answer 1

You have to go out to AD for that information. But connecting to AD in ASP.NET Core isn't straight-forward.

If you are only going to run this on a Windows server, then you can install Microsoft.Windows.Compatibility from NuGet, and use DirectoryEntry to bind directly to the object using its SID. The SID is available in context.User.Identity.User.Value.

<AuthorizeView>
@{
    var identity = (WindowsIdentity) context.User.Identity;
    var user = new DirectoryEntry($"LDAP://<SID={identity.User.Value}>");

    //Add any other attributes you want to read to this list
    user.RefreshCache(new [] { "givenName" });
}
    Hello, @user.Properties["givenName"].Value!
</AuthorizeView>

Other attributes you might be interested in:

• sn: Last name
• displayName: How their name is displayed in Outlook, for example. Often this is "Last, First"