HTML Helper to Display the Logged In User's DisplayName

22 Mar 2015 • Visual Studio • IAM

It is pretty common to display the logged-in user in various places in a website. We can create an HTML helper to display the logged-in user’s name.

public static MvcHtmlString UserDisplayName(this HtmlHelper htmlHelper)
{
    if (htmlHelper.ViewContext.HttpContext.Request.IsAuthenticated)
    {
        ClaimsPrincipal principal = htmlHelper.ViewContext.HttpContext.User as ClaimsPrincipal;
        if (principal == null)
        {
            throw new InvalidCastException("The current principal is not a claims principal.");
        }

        var nameClaim = principal.Claims.FirstOrDefault(t => t.Type == "name"); //use any claim that need to be displayed as UserDisplayName
        if (nameClaim != null)
        {
            return new MvcHtmlString(nameClaim.Value);
        }
    }

    return new MvcHtmlString("Anonymous");

}

Then the helper can be used on the navigation bar or any other UI widget that need to display user name.

<ul class="nav navbar-nav navbar-right">  
    <li class="dropdown navbar-text">
        Hi, @Html.UserDisplayName()
    </li>
</ul>
 claims

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