How to get the current logged in user ID in ASP.NET Core?

👋 Hey there, fellow tech enthusiasts! 😄 It's time to dive into another exciting blog post 😎 where we explore how to get the current logged in user ID in ASP.NET Core! 🚀

So, you've encountered a situation where the trusty User.Identity.GetUserId() method from MVC5 doesn't seem to work in your ASP.NET Core project. Don't worry, we've got your back! 🤓

Identifying the Issue

As you rightly mentioned, the User.Identity object doesn't provide the GetUserId() method in ASP.NET Core. This change was brought about by the introduction of the Microsoft.AspNetCore.Identity namespace and its corresponding extension methods.

The Solution

To retrieve the current logged in user ID in ASP.NET Core, you can follow these straightforward steps:

1. Inject the UserManager<TUser> service into your desired class or controller. You can do this by including it as part of the constructor. For example, if you are using it in a controller, your code would look something like this:

   private readonly UserManager<IdentityUser> _userManager; public YourController(UserManager<IdentityUser> userManager) { _userManager = userManager; }

2. Now that you have access to the UserManager<TUser> service, you can retrieve the user ID using the GetUserIdAsync() method provided by the UserManager<TUser> class. Here's how you can do it:

   string userId = await _userManager.GetUserIdAsync(User);

   The User object passed to the GetUserIdAsync() method represents the current authenticated user.

3. Voila! 🎉 You now have the current logged in user ID in the userId variable. You can use it as needed in your code.

An Example to Put Things into Perspective

Let's consider a scenario where you need to retrieve the current logged in user ID to store it in the database for auditing purposes. Here's how you could implement it:

public async Task<IActionResult> AuditAction()
{
    // Retrieve the current logged in user ID
    string userId = await _userManager.GetUserIdAsync(User);

    // Logic to store the user ID in the database for auditing

    return View();
}

Take It to the Next Level!

Now that you know how to get the current logged in user ID in ASP.NET Core, why not explore further and implement personalized experiences for your users? You can use this user ID to fetch user-specific data from your database, track user behavior, or even build custom authorization logic. The possibilities are endless! 💡

We hope this blog post helped you out and resolved any confusion you had regarding retrieving the current logged in user ID in ASP.NET Core. If you found this guide helpful, be sure to share it with your friends and colleagues and let us know your thoughts in the comments below! 💌

Happy coding! 💻✨