How Do I Retrieve the Currently Logged-in User in ASP.NET MVC?

Accessing Current User Details in ASP.NET MVC Applications

Older ASP.NET applications relied on Page.CurrentUser to identify the logged-in user. This method is unsuitable for ASP.NET MVC applications due to their controller-based request handling.

The Solution:

Within an ASP.NET MVC controller, the User property of the Controller base class provides access to the authenticated user's data via a ClaimsPrincipal object:

<code class="language-csharp">public class HomeController : Controller
{
    public ActionResult Index()
    {
        // Access the authenticated user's ClaimsPrincipal
        ClaimsPrincipal currentUser = User;
        //Further processing of currentUser...
    }
}</code>

For views, you can either pass the necessary user information via ViewData or directly use the User property:

<code class="language-csharp">// Within the controller:
ViewData["UserName"] = User.Identity.Name;

// In the view:
@ViewData["UserName"] // Displays the logged-in user's name</code>

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